NAQTC Asphalt & Asphalt Extended Module
AS & AE - index
9-20-08
Special Requirements
All technicians must certify for these tests, except, a technician can choose either T166 or T275
Test Method MECH. ANALYSIS OF EXTRACTED AGGREGATE BULK SPECIFIC GRAVITY or BULK SP. GR. OF PARAFFIN SPECIMENS THEORETICAL MAXIMUM SPECIFIC GRAVITY AND DENSITY OF HMA REDUCING FIELD SAMPLES PERCENT AIR VOIDS ASPHALT CONTENT BY IGNITION OVEN METHOD A only Asphalt – E
Technician must certify in these tests
QUANTITATIVE EXTRACTION – Ashing only RESISTANCE TO PLASTIC FLOW OF BITUMINOUS MIXTURES USING MARSHALL APPARATUS
Test Designation
Pages
T30*
1
T166
2
T275
3
T209
4
T248**
5
T269
6
T308
7
T164
8
T245
10
*Exempt if qualified in Aggregate Module (doesn’t apply for written exam) **Exempt if qualified in Sampling & Density Module (doesn’t apply for written exam)
Date: ____________________ Student: ____________________
1st
2nd
PASS
FAIL
FAIL Assessor: _______________________
PASS
NAQTC Asphalt & Asphalt Extended Module
AS & AE - 1
MECHANICAL ANALYSIS OF EXTRACTED AGGREGATE
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19.
(AASHTO T30)
1st/ 2nd
Sample consists of all aggregate after extraction? ................................................................................................ ____/___ Minimum mass of mix sample based on nominal maximum size? ....................................................................... ____/___ Total wt. of agg. for percent calculation = Wt. dry agg. plus mineral matter in extracted bitumen (ash + filter from extraction)?............................................................................................................................... ____/___ Sample placed in container and covered with water? ........................................................................................... ____/___ Wetting agent added? ........................................................................................................................................... ____/___ Contents of container agitated vigorously? .......................................................................................................... ____/___ Wash water poured through proper nest of two sieves? ....................................................................................... ____/___ Washing continued until wash water is clear?...................................................................................................... ____/___ Washed material coarser than 75-µm (No. 200) dried to constant mass per T255?.............................................. ____/___ Material weighed to nearest 0.1 percent? ............................................................................................................. ____/___ Material mechanically sieved on specified sieves (including 75-µm)?................................................................. ____/___ Sieving continued until not more than 0.5 percent by mass of the total sample passes a given sieve in 1 min. (check by hand with 8 in. diameter sieve)? .................................................................................. ____/___ Sieves not overloaded, refer to procedure for calculation?................................................................................... ____/___ Each fraction of aggregate weighed, including minus 75-µm (No. 200)? ............................................................ ____/___ Does summation of fraction mass check total washed dry mass (#10 above) within 0.2 percent? ....................... ____/___ Total minus 75-µm (No. 200) = minus 75-µm by sieving + minus 75-µm by washing + mass of mineral matter (ash + filter)?................................................................................................................ ____/___ Sizes larger than 75-µm (No. 200) reported to nearest 1.0 percent?..................................................................... ____/___ Minus 75-µm (No. 200) material reported to nearest 0.1 percent? ....................................................................... ____/___ Calculations performed within 30minutes time limit? .......................................................................................... ____/___
COMMENTS:
Date: ____________________ Student: ____________________
1st
2nd
PASS
FAIL
FAIL Assessor: _______________________
PASS
NAQTC Asphalt & Asphalt Extended Module
AS & AE - 2
BULK SPECIFIC GRAVITY OF COMPACTED BITUMINOUS MIXTURES st nd (AASHTO T166) 1 / 2 USING SATURATED SURFACE-DRY SPECIMENS 1. (a)
(b)
(c) (d)
Mass (g) of dry sample in air determined? ................................................................................................. ____/___ 1) Dried overnight at 52 ± 3°C (125 ± 5°F) and at successive 2 hr. intervals to constant mass (0.05 percent)? ......................................................................................................................... ____/___ 2) Cooled to room temperature, 25 ± 5°C (77 ± 9°F), and weighed? ................................................... ____/___ Immersed mass determined?....................................................................................................................... ____/___ 1) Immersed 4 ± 1 min.? ....................................................................................................................... ____/___ 2) Water at 25 ± 1°C (77 ± 1.8°F)?....................................................................................................... ____/___ 3) Each specimen immersed and weighed individually? ...................................................................... ____/___ Saturated surface-dry mass determined? .................................................................................................... ____/___ Quickly blotted with damp towel?.............................................................................................................. ____/___
2. Percent water absorbed determined to be less than 2 percent? ................................................................................. ____/___ 3. Refer to AASHTO for the formulas used to calculate specific gravity & absorption of specimen?......................... ____/___ (a) Bulk Specific Gravity reported to nearest 0.001? ....................................................................................... ____/___ (b) Absorption reported to nearest 0.01?.......................................................................................................... ____/___ COMMENTS:
Date: ____________________ Student: ____________________
1st
2nd
PASS
FAIL
FAIL Assessor: _______________________
PASS
NAQTC Asphalt & Asphalt Extended Module
AS & AE - 3
BULK SPECIFIC GRAVITY OF COMPACTED BITUMINOUS MIXTURES USING PARAFFIN-COATED SPECIMENS 1.
(AASHTO T275)
1st/ 2nd
SPECIMENS (a) Recommended size: Diameter (or side of sawed specimens) at least 4X maximum size of aggregate?....................................... ____/___ Thickness at least 1 ½ X maximum size of the aggregate? ......................................................................... ____/___ (b) Drying to constant mass: 1) Overnight at 52 ± 3°C (125 ± 5°F)? .................................................................................................. ____/___ 2) Additional 2 hr. drying intervals? ...................................................................................................... ____/___ 3) Constant mass (change less than 0.05 percent)? ................................................................................ ____/___
2. (a) (b) (c) (d) (e)
Mass in air determined (dry; see 1 (b) above)?............................................................................................ ____/___ Room temperature 25 ± 5°C (77 ± 9°F)?..................................................................................................... ____/___ Coated with paraffin, filling all voids? ........................................................................................................ ____/___ Cooled 30 min., then weighed in air? .......................................................................................................... ____/___ Immersed in water at 25 ± 1°C (77 ± 2°F) and weighed?............................................................................ ____/___ Sp. Gr. of paraffin determined (if unknown)? ............................................................................................. ____/___
3. Refer to AASHTO for formulas used to calculate specific gravity of specimen? ..................................................... ____/___ COMMENTS:
Date: ____________________ Student: ____________________
1st
2nd
PASS
FAIL
FAIL Assessor: _______________________
PASS
NAQTC Asphalt & Asphalt Extended Module
AS & AE - 4
THEORETICAL MAXIMUM SPECIFIC GRAVITY AND DENSITY HMA 1.
(AASHTO T209)
1st/ 2nd
Mass of sample as follows (samples larger than the capacity of the container may be divided into suitable increments, tested, and the results averaged):
Min. sample size (g) Largest Particle Size 50.0 mm (2 in.) ................................................. 6000 _____ 37.5 mm (1 ½ in.) ............................................. 4000 _____ 25.0 mm (1 in.) ................................................. 2500 _____ 19.0 mm (3/4 in.) .............................................. 2000 _____
Not required to be memorized
Largest Particle Size Min. sample size (g) 12.5 mm (1/2 in.) ............................................. 1500 _____ 9.5 mm (3/8 in.) ............................................... 1000 _____ 4.75 mm (No. 4) ................................................ 500 _____ 2. 3. 4. or 5. 6. 7. 8. 9. 10. 11.
Particles of sample separated? (Sample may be placed in large pan and warmed in oven until workable.).......... ____/___ After separation, fine aggregate particles not larger than 6.3 mm (1/4 in.)?.......................................................... ____/___ Laboratory prepared samples cured and dried to constant mass (within 0.1%) in an oven at 135 ± 5°C for a minimum of 2 hours? .................................................................................................................................... ____/___ Field samples dried to constant mass in oven at 105 ± 5°C (221 ± 9°F)?.............................................................. ____/___ Cool at room temperature? .................................................................................................................................... ____/___ Placed in tared container and weighed and net mass of sample determined? ........................................................ ____/___ Water at approx. 25°C (77°F) added to cover sample? ......................................................................................... ____/___ Vacuum increased until manometer reads 3.7 ± 0.3 kPa (27.75 ± 2.25 mm Hg)? ................................................. ____/___ Entrapped air removed using partial vacuum for 15 ± 2 min? ............................................................................... ____/___ Container and contents agitated during vacuum using mechanical device .......................................................... ............................................................................................................................................................................... ____/___ Release of vacuum by increasing pressure at a rate not to exceed 8 kPa per second? ........................................... ____/___
12.
Weighing-in-air determination: (a) Container filled with water? ........................................................................................................................ ____/___ (b) Contents adjusted to 25 ± 1°C (77.0 ± 2°F)? ............................................................................................... ____/___ (c) Mass of filled container & Contents determined? ....................................................................................... ____/___ (d) Weighing of filled container determined 10 ± 1 min. after removal of entrapped air completed? .............. ____/___ See Appendix for correcting gravity when measurements are made at temps. other than 25°C.
13.
Refer to AASHTO for formulas used to calculate specific gravity of mixture? .................................................... ____/___
COMMENTS:
Date: ____________________ Student: ____________________
1st
2nd
PASS
FAIL
FAIL
PASS
Assessor: _______________________
NAQTC Asphalt & Asphalt Extended Module
AS & AE - 5
REDUCING SAMPLES OF AGGREGATE TO TESTING SIZE (T248)
1st/ 2nd
PROCEDURE Method A - Splitting 1. Material spread uniformly on feeder? ............................................................................................................... ___/___ 2. Rate of feed slow enough so that sample flows freely through chutes? ............................................................ ___/___ 3. Material in one pan re-split until desired weight is obtained?........................................................................... ___/___ Method B - Quartering 1. Sample placed on clean, hard, and level surface? ............................................................................................. ___/___ 2. Mixed by turning over 3 times with shovel?..................................................................................................... ___/___ 3. Conical pile formed?......................................................................................................................................... ___/___ 4. Pile flattened to uniform thickness and diameter? ............................................................................................ ___/___ 5. Diameter about 4 to 8 times thickness?............................................................................................................. ___/___ 6. Divided into 4 equal portions with shovel or trowel? ....................................................................................... ___/___ 7. Two diagonally opposite quarters, including all fine material, removed? ......................................................... ___/___ 8. Cleared space between quarters brushed clean? ............................................................................................... ___/___ 9. Process continued until desired sample size is obtained? ................................................................................. ___/___
Method C - Miniature Stockpile Sampling (Fine Aggregate Only) 1. Sample placed on clean, hard, and level surface? ............................................................................................. ___/___ 2. Material thoroughly mixed by turning over three times? .................................................................................. ___/___ 3. Small/miniature stockpile formed? ................................................................................................................... ___/___ 4. Obtain sample for each test by selecting at least 5 increments of materials at random location from miniature stockpile, using sampling thief, small scoop, or spoon? ................................................................................... ___/___ COMMENTS:
Date: ____________________ Student: ____________________
1st
2nd
PASS
FAIL
FAIL
PASS
Assessor: _______________________
NAQTC Asphalt & Asphalt Extended Module
AS & AE - 6
PERCENT AIR VOIDS IN COMPACTED DENSE AND OPEN BITUMINOUS PAVING MIXTURES
(AASHTO T269)
1st/ 2nd
Procedure 1. For Dense Bituminous Paving Mixtures (a) Bulk specific gravity determined by either T166 or T275? ......................................................................... ____/___ (b) Theoretical maximum specific gravity determined by T209? ..................................................................... ____/___ 2.
For Open Bituminous Paving Mixtures (a) Density of bituminous mixture determined from its dry mass and its volume?........................................... ____/___ (b) Height of specimen determined? ................................................................................................................. ____/___ (c) Volume of specimen determined based on average height and diameter measurement? ............................ ____/___ (d) Density converted to bulk specific gravity? ................................................................................................ ____/___ (e) Theoretical maximum specific gravity determined by T209? ..................................................................... ____/___
3.
Percent air voids calculated in accordance with method? ..................................................................................... ____/___ Percent air voids = 100 [1 - (bulk sp gr / theoretical max sp gr)]
COMMENTS:
Date: ____________________ Student: ____________________
1st
2nd
PASS
FAIL
FAIL Assessor: _______________________
PASS
NAQTC Asphalt & Asphalt Extended Module
AS & AE - 7
DETERMINING THE ASPHALT CONTENT OF HOT MIX (AASHTO T308) 1st/ 2nd ASPHALT (HMA) BY THE IGNITION METHOD - Method A only 1.
Sampling (a) Sample aggregate in accordance to T2 and reduce in accordance to T248? ................................................ ____/___ (b) Samples of asphalt binder obtained in accordance to T40? ......................................................................... ____/___ (c) Samples of freshly produced hot-mix asphalt obtained in accordance to T168? ......................................... ____/___ (d) Mixture warmed in an oven at 110 ± 5°C (230 ± 9°F) until it can be handled if necessary? ...................... ____/___ (e) Minimum mass of sample shall conform to the requirement of table 1? ..................................................... ____/___
2.
Calibration (a) Prepare two calibration samples at the design asphalt content? .................................................................. ____/___ (b) Prior to mixing prepare a butter mix? .......................................................................................................... ____/___ (c) Mix and discard the butter mix prior to mixing any of the calibration specimens? ..................................... ____/___ (d) A blank specimen shall be batched and tested according to T30? ............................................................... ____/___ (e) Freshly mixed specimens may be placed directly in the sample basket?..................................................... ____/___ (f) If the freshly mixed specimens were allowed to cool, the samples must be dried to constant mass at a temperature of 110 ± 5°C (230 ± 9°F)? ...................................................................................................... ____/___ (g) Perform a gradation analysis on the residual aggregate? ............................................................................. ____/___ (h) Compare this gradation to the gradation of the unburned blank specimen? ................................................ ____/___ (i) Determine the asphalt binder content for each of the calibration samples by calculation or printed ticket? ____/___ (j) If the difference between measured asphalt binder content of the two samples exceeds 0.15% repeat the two tests? ............................................................................................................................................................ ____/___ (k) From the four tests, discard the high and low results?................................................................................. ____/___ (l) Determine the calibration factor from the two remaining results?............................................................... ____/___ (m) Calculate the difference between the actual and measured asphalt binder content for each sample? .......... ____/___ (n) The calibration factor is the average of the difference expressed in % by weight of the asphalt mixture?.. ____/___
3.
Ignition Procedure by Method A (a) Convection-type furnace preheated to 538°C (1000°F) or the calibration temperature? ............................... ___/___ (b) Temperature recorded prior to test if furnace does not automatically?.......................................................... ___/___ (c) Sample dried to constant mass at 110 ± 5°C (230 ± 9°F)? ............................................................................ ___/___ Test specimen for moisture determination obtained if necessary and moisture content determined according to AASHTO T329? .................................................................................................... ___/___ (d) Calibration factor entered for the mix?.......................................................................................................... ___/___ (e) Basket(s) placed in catch pan and weighed with guards in place? ................................................................ ___/___ (f) Sample evenly distributed in the basket, material kept away from edges and leveled?................................. ___/___ (g) Total mass of the sample, basket, catch pan and basket guards recorded? .................................................... ___/___ (h) Initial mass of the specimen calculated?........................................................................................................ ___/___ (i) Initial mass entered into the furnace controller and verified?........................................................................ ___/___ (j) Baskets placed in the furnace and chamber door closed? .............................................................................. ___/___ (k) Furnace scale agrees within 5 g of the total mass? ........................................................................................ ___/___ (l) Pressing the start button locks the door and starts the blower?...................................................................... ___/___ (m) Test continued until change in mass does not exceed 0.01 percent for three consecutive minutes?.............. ___/___ (n) Pressing the stop button unlocks the door and prints the test results? ........................................................... ___/___ (o) Corrected asphalt content (%) from the printed ticket reported? ................................................................... ___/___ (p) Moisture content subtracted from the printed ticket and the difference reported?......................................... ___/___
or
or 4.
Gradation (a) Contents emptied into a flat pan, including any residual fines? .................................................................. ____/___ (b) Gradation analysis performed according to T30? ........................................................................................ ____/___
COMMENTS:
Date: ____________________ Student: ____________________
1st
2nd
PASS
FAIL
FAIL
PASS
Assessor: _______________________
NAQTC Asphalt & Asphalt Extended Module
AS & AE - 8
APPARATUS FOR QUANTITATIVE EXTRACTION OF BITUMEN FROM BITUMINOUS PAVING MIXTURES
(AASHTO T164)
1st/ 2nd
1.
Sample Preparation (a) If necessary, mixture warmed in pan at 230 ± 9°F (110 ± 5°C) until it can be handled? ........................... ____/___ (b) Particles of mixture separated with spatula or trowel? ............................................................................... ____/___ (c) Sample obtained by splitting or quartering? ............................................................................................... ____/___ (d) Sample mass conforms to table 1?.............................................................................................................. ____/___ (e) Sample divided into equal portions for multiple extractions if necessary?................................................. ____/___ (f) If necessary, test specimen for moisture determination obtained?.............................................................. ____/___
2.
Moisture Content (a) Moisture content of mixture determined by T329?..................................................................................... ____/___ Note: moisture content not necessary if percent bitumen is not determined............................................... ____/___ (b) If recovery of bitumen is not required, entire test specimen may be dried at a temperature of 300 - 325°F (149 - 163°C) for 2 to 2 1/2 hrs. prior to extraction? .............................................................. ____/___
or
3.
or or
Extraction Procedure by Method A (a) Weighed test portion placed into bowl? ..................................................................................................... ____/___ (b) Sample covered with solvent? .................................................................................................................... ____/___ (c) Sample allowed to disintegrate for not more than 1 hr.? ............................................................................ ____/___ (d) Bowl with solvent and sample placed in extraction apparatus?.................................................................. ____/___ (e) Filter ring dried to constant mass in oven at 230 ± 9°F (110 ± 5°C)? ........................................................ ____/___ (f) Filter ring weighed?.................................................................................................................................... ____/___ (g) Filter ring fitted around edge of bowl? ....................................................................................................... ____/___ (h) Cover clamped tightly on bowl?................................................................................................................. ____/___ (i) Container placed under drain to collect extract?......................................................................................... ____/___ (j) Centrifuge started revolving slowly and speed increased gradually? ......................................................... ____/___ (k) Maximum speed not greater than 3600 rpm?.............................................................................................. ____/___ (l) Centrifuge continued until solvent ceases to flow? .................................................................................... ____/___ (m) Centrifuge stopped and 200 mL or more of solvent added? ....................................................................... ____/___ (n) Steps (j), (k), (l), and (m) repeated?............................................................................................................ ____/___ (o) At least 3 increments of solvent added? ..................................................................................................... ____/___ (p) Last extract clear and not darker than light straw color? ............................................................................ ____/___ (q) Extract and washings collected in suitable graduate?................................................................................. ____/___ 1) Filter ring and aggregate transferred to tared metal pan? ................................................................. ____/___ 2) Contents dried in air under a hood until fumes dissipate? ................................................................ ____/___ 3) Contents dried to constant mass in oven at 110 ± 5°C (230 ± 9°F)? ................................................ ____/___ 4) Initial dry mass of filter ring subtracted from mass of contents in pan to determine mass of extracted aggregate (W3)? ............................................................................................................ ____/___ (r) 1) Filter ring may be dried separately to constant mass in an oven at 110 ± 5°C (230 ± 9°F)? ............ ____/___ 2) Aggregate dried to constant mass in an oven or on a hot plate at 110 ± 5°C (230 ± 9°F)? .............. ____/___ (s) Bowl, aggregate, and filter ring dried to constant mass in an oven at 110 ± 5°C (230 ± 9°F)? .................. ____/___
COMMENTS:
Date: ____________________ Student: ____________________
1st
2nd
PASS
FAIL
FAIL
PASS
Assessor: _______________________
NAQTC Asphalt & Asphalt Extended Module
AS & AE - 9
APPARATUS FOR QUANTITATIVE EXTRACTION OF BITUMEN FROM BITUMINOUS PAVING MIXTURES (cont.) or
(t)
(u)
4.
(AASHTO T164)
1st/ 2nd
If low-ash filter paper used: 1) Aggregate and filter ring placed in clean metal pan?........................................................................ ____/___ 2) Contents dried to constant mass in oven at 110 ± 5°C (230 ± 9°F?.................................................. ____/___ 3) Dried filter ring folded, stood on aggregate, and then burned in pan with aggregate to avoid loss? ____/___ Mineral matter in the extract determined by one of the procedures specified?........................................... ____/___
Total Mineral Matter Determination Ashing Method: (a) Volume or mass of total extract and washings recorded?........................................................................... ____/___ (b) Ignition dish conditioned in furnace and mass determined to 0.001 g? ...................................................... ____/___ (c) Extract thoroughly agitated?....................................................................................................................... ____/___ (d) Approx. 100 mL immediately measured to tared ignition dish? ................................................................. ____/___ (e) Ignition dish evaporated to dryness on steam bath or hot plate? ................................................................ ____/___ (f) Residue ashed at dull red heat (500 - 600°C) and cooled? ......................................................................... ____/___ (g) Mass of ash determined or estimated? ........................................................................................................ ____/___ (h) 5 mL of ammonium carbonate solution added per g of ash? ...................................................................... ____/___ (i) Digested at room temperature for l hour? ................................................................................................... ____/___ (j) Dried in oven to constant mass at 110 ± 5°C (230 ± 9°F)? ........................................................................ ____/___ (k) Cooled in desiccator and weighed to the nearest 0.001 g? ......................................................................... ____/___ (l) Net mass of ash determined? ...................................................................................................................... ____/___ W = G[V1/(V1 - V2 )]
COMMENTS:
Date: ____________________ Student: ____________________
1st
2nd
PASS
FAIL
FAIL
PASS
Assessor: _______________________
NAQTC Asphalt & Asphalt Extended Module
AS & AE - 10
RESISTANCE TO PLASTIC FLOW OF BITUMINOUS MIXTURES USING MARSHALL APPARATUS
(AASHTO T245)
1st/ 2nd
1.
Mixing and compaction temperatures are based upon the temp.-viscosity curve for the asphalt (170 ± 20 cSt for mixing, 280 ± 30 cSt for compacting) (ORAL) ?...................................................................... ____/___
2.
Preparation of Mixture(ORAL) (a) Initial batch prepared for "buttering" the mixing bowl and stirrers and bowl and stirrers cleaned by scraping, not wiped with cloth or solvent? ............................................................................................. ____/___ (b) At least 3 specimens prepared for each combination of aggregates and bitumen content? ......................... ____/___ (c) Amount of each aggregate size fraction required for each single specimen weighed into a pan and thoroughly mixed?................................................................................................................................ ____/___ (d) Pan containing aggregate placed on a hot plate or in an oven and heated to a temperature not exceeding the mixing temperature by more than approx. 28°C (50°F)?...................................................... ____/___ (e) Hot aggregate placed in mixing bowl and crater formed in aggregate? ...................................................... ____/___ (f) Required amount of preheated bituminous material added to aggregate? ................................................... ____/___ (g) At this point, temperature of the aggregate and bituminous material within the established mixing temperature limits? ...................................................................................................................................... ____/___ (h) Aggregate and bituminous material rapidly mixed until thoroughly coated? .............................................. ____/___ (i) If hot plate used during mixing, wire mesh (or similar material) used to prevent direct contact between hot plate and mixing bowl? ......................................................................................................................... ____/___
3.
Compaction of Specimens (a) Specimen mold assembly and face of the compaction hammer clean? ....................................................... ____/___ (b) Mold assembly and hammer heated in boiling water, on a hot plate or in an oven at 93 to 149°C (200 to 300°F)? ....................................................................................................................... ____/___ (c) Filter paper or paper toweling placed in bottom of mold?........................................................................... ____/___ (d) Entire batch of mixture placed in mold? ..................................................................................................... ____/___ (e) Mixture spaded vigorously with heated spatula or trowel? ......................................................................... ____/___ (f) Spaded 15 times around perimeter?................................................................................................... ____/___ (g) Spaded 10 times over the interior? .................................................................................................... ____/___ (h) Surface of mix smoothed to slightly rounded shape? .................................................................................. ____/___ (i) Temperature of the mixture immediately prior to compaction within the limits of established compacting temperature? .......................................................................................................... ____/___ (j) Filter paper placed on mixture, and mold assembly placed in mold holder on compaction pedestal? .................................................................................................................................. ____/___ (k) 50 or 75 blows applied unless otherwise specified, with hammer held vertically? ..................................... ____/___ (l) Mold and contents reversed?....................................................................................................................... ____/___ (m) Same number of blows applied to reversed specimen? ............................................................................... ____/___ (n) Sample extractor placed on the end of the specimen? ................................................................................. ____/___ (o) Assembly, with collar up, placed in testing machine?................................................................................. ____/___ (p) Pressure applied to collar via load transfer bar?.......................................................................................... ____/___ (q) Specimen forced into collar or otherwise extruded up into collar (no free-fall of specimen)?.................... ____/___ (r) Collar lifted from specimen and specimen transferred to smooth flat surface? ........................................... ____/___ (s) Allowed to stand overnight at room temperature? (ORAL) ........................................................................ ____/___ (t) Specimen weighed?..................................................................................................................................... ____/___ (u) Specimen measured? ................................................................................................................................... ____/___ Height: 63.5 ± 1.3 mm (2.50 ± 0.05 in.)? .................................................................................................... ____/___
COMMENTS:
Date: ____________________ Student: ____________________
1st
2nd
PASS
FAIL
FAIL Assessor: _______________________
PASS
NAQTC Asphalt & Asphalt Extended Module
AS & AE - 11
st nd RESISTANCE TO PLASTIC FLOW OF (AASHTO T245) 1 / 2 BITUMINOUS MIXTURES USING MARSHALL APPARATUS (cont.)
4.
Testing of Specimens (a) Specimens brought to test temperature by immersing in water bath for 30 to 40 min. or placing in an oven for 2 hrs.? ........................................................................................................................ ___/___ (b) Bath or oven maintained at 60 ± 1°C (140.0 ± 1.8°F)? ............................................................................... ____/___ (c) Guide rods and inside surfaces of breaking head cleaned? ......................................................................... ____/___ (d) Guide rods lubricated? ................................................................................................................................ ____/___ (e) Temperature of breaking head maintained at 21 to 38°C (70 to 100°F)? .................................................... ____/___ (f) Specimen removed from bath or oven and placed in lower segment of breaking head? ............................. ____/___ (g) Upper segment placed on specimen? .......................................................................................................... ____/___ (h) Breaking head and specimen positioned on testing machine?..................................................................... ____/___ (i) Flow meter (if used) placed over guide rod and adjusted to zero? .............................................................. ____/___ (j) Load applied to specimen until maximum load is reached? ........................................................................ ____/___ (k) Maximum load applied within 30 seconds after removal of specimen from bath or oven?......................... ____/___ (l) Maximum load and flow value recorded? ................................................................................................... ____/___ (m) For core specimens, load corrected when thickness of specimen is not 63.5 mm (2 ½ in.) by multiplying by factor from Table 1?....................................................................................................... ____/___ Note: Load is not to be corrected when laboratory prepared specimens are tested.
COMMENTS:
Date: ____________________ Student: ____________________
1st
2nd
PASS
FAIL
FAIL Assessor: _______________________
PASS
