CBR PLUS CON-AID

CONCON-AID / CBR PLUS in Haul Roads Haul roads forms an important part in the transport industry. They are used mainly in opencast mining, forestry and sugarcane operations. Haul trucks with tare of 60 tonnes and a payload of 150 tonnes are commonly used in the opencast mining industry. While forestry and sugar cane estates used logging- and fire fighting trucks in excess of 25 tonnes. CON-AID has extensive experience in assisting in maintenance of haul road projects. SOME OF THE PROBLEMS: Due to the size of the haul trucks used in the mining industry roads up to 30 meters wide and more are required. Drainage and maintenance is often difficult and costly. The gooseneck of articulated haulers are very sensitive to unevenness and roughness of the road and blade maintenance is continuously required. During dry seasons dust is the major problem contributing to driver fatigue. During rainy weather slipperiness and deformation becomes the major problems creating loss of productivity. Because of the high tyre pressure and heat generation by the wheels normal bitumen seals are unsuitable and a natural soil or gravel surface is accepted. CON-AID / CBR PLUS – spray-on technique: CON-AID / CBR PLUS has been successfully used on natural gravel roads to reduce maintenance cost in: • • •

Grading. Minimizing application of water for dust preventions. Increase production during rainy seasons.

Haul roads in the mining industry is designed and constructed conventionally to carry abnormal loads.

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CBR PLUS CON-AID

CON-AID / CBR PLUS is applied in small quantities on the surface by using a water tanker normally used for dust control.

This surface treatment has the following purposes: •

•

CON-AID / CBR PLUS reduce the amount of dust produced by vehicles, therefore reduce the number of water spraying operations for example from four application per day to one per day. After a relatively short period the road surface becomes more negotiable during rainy weather, which results in less grading. Grading is reduced on a road from ten times to one over a certain period, thus result in maintenance cost savings.

It should be clearly understood that when heavy vehicles used a haul road frequently such roads should be designed and constructed according to engineering requirements. CON-AID / CBR PLUS can only successfully used in the top layer. In most cases where roads are being used the surface is reasonably maintained and in fair condition. In such cases there is no need to break up the surface to introduce CON-AID / CBR PLUS and the spray-on technique may be used. Small amounts of CON-AID are put into the water tanker when wetting the surface as for dust suppression. Normal

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CBR PLUS CON-AID

procedure is CON-AID treated water one day followed by pure water application the next day. This alternative spraying is continued until the prescribed amount of CON-AID has been applied. These remarks apply to existing roads with a sound substructure. Below is a list of clients that has used CON-AID satisfactory. 1.

SASOL Coal Driehoek shaft

2.

HL&H Mining Timber Rosehaugh, Nelspruit

3.

Ubombo Ranches (sugar Estate) Swaziland a. b. c. d. e.

Main Haulage to mill Road width Cain to mill Sugar from mill Coal, fertiliser & waste

15 km 10 m 1 800 000 tonnes 260 000 tonnes 40 000 tonnes

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CBR PLUS CON-AID

f. Busses g. Light traffic h. Maintenance Re-gravel Grade

4.

130 per day 900 per day Untreated Twice 10 times

Treated None 2 times

Simunye Sugar Estates, Swaziland: a. Main haulage 120 km b. Cane 70 tonnes on 9 axles 170 loads per day c. Other fertilizer, coal & Light traffic once every minute d. aintenance Untreated Treated Re-gravel Every 3 months none Grade Once a month once Before CON-AID treatment After three years before sealing

After three years the roads was sealed with money saved on maintenance.

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CBR PLUS CON-AID

5.

Mondi Forests Renosterhoek, Sabie Traffic Count Average No per day 45 tonnes, 6 axles 20 25 tonnes, 4 axles 108 5 tonnes, 2 axles 16 1 tonne, 2 axles 84 A number of products were put down under supervision of The Council for Scientific and Industrial Research (CSIR). After 18 months Mondi decided to use CON-AID.

6.

Mondi Forests Ramanas Mill: Haul road to mill No maintenance for 6 years Many more roads for Mondi Forests, such as a. Doornlaagte Section 1 and 2 b. London Plantation, main along NR3, c. Grootfontein Plantation

7.

Mondi Warburton airstrip

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CBR PLUS CON-AID

8.

SAPPI Forests Grootgeluk

9.

Tzaneen Wood from plantation to processing plants as well as to rail station

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