Abstract
The use of marginal materials stabilized by cement for base course applications has grownrapidly. Marginal materials consist of marginal crushed rock (MCR), marginal lateritic soil (MLS), andreclaimed asphalt pavement (RAP). However, the use of cement will release high CO2 causing the greenhouseeffect. This research investigates the stabilization of marginal crushed rock using cement (C) and fly ash (FA)as a green base course material. FA used as pozzolanic binders was obtained from the Mae Moh power plantin Thailand. The physical and engineering properties of MCR stabilized by OPC-FA were evaluated accordingto the specification of the Department of Highways in Thailand. The influencing factors studied included bindercontent of 1%, 3%, and 5% by weight of the crushed rock material, C/FA ratios of 100/0, 90/10, 80/20, 70/30,60/40, and 50/50, and curing time of 7. The optimum ingredient of MCR stabilized by B was found at a bindercontent of 3% and C/FA ratios of 60/40. The strength development in MCR mixed with C and FA at all Bcontent and C/FA ratio can be normalized by 28-day compressive strength. The proposed equation is usefulfor predicting the compressive strength of MCR mixed with C and FA. This research enables FA, which is aresidue material, to be used as a green base course material.
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