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Chiang Mai J. Sci. 2013; 40(1) Chiang Mai J. Sci. 2013; 40(1) : 126-134 http://it.science.cmu.ac.th/ejournal/ Contributed Paper

Effects of Fine Bagasse Ash on the Workability and Compressive Strength of Mortars Piyanut Muangtong [a], Suvimol Sujjavanich [c], Sansanee Boonsalee [d], Sumate Poomiapiradee [e], and Duangrudee Chaysuwan *[a,b] [a] Department of Materials Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand. [b] Center for Advanced Studies in Industrial Technology, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand. [c] Department of Civil Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand. [d] Department of Science Service, Ministry of Science and Technology, Bangkok 10400, Thailand. [e] Thailand Institute of Scientific and Technological Research, Ministry of Science and Technology, Pathumthani 12120, Thailand. *Author for correspondence; e-mail: [email protected] Received: 30 January 2012 Accepted: 29 June 2012

ABSTRACT There are various kinds of agricultural waste ashes throughout the industrial processes in Thailand such as sugar cane bagasse ash (SCBA), rice husk ash, oil palm ash etc. They are currently exploited as pozzolanic materials and supplements to improve the compressive strength in terms of microstructures of cement by partly replacement of cement with them. One of their advantages is to decrease CO2 gas emission from decreasing consumption of cement in either mortar or concrete production. Appropriate ratio of replacing clinker by fine (