การประมาณค่าความหนาแน่นแห้งสูงสุดและปริมาณน้ำที่เหมาะสมของทรายบดอัด

Abstract

Fine content in sands and its plasticity have significant effect on compaction of sands. The objective of this study was to determine how the fine contents and their plasticity affect the maximum dry density and optimum water content of compacted sands. Well-graded and poorly-graded sands were mixed with 3 fines which were Ranong Kaolin (PI=17.84%), Kho Yo marine clay (PI=24.90%), and Khor Hong Lateritic soil (PI=28.71%). The fine contents used were 5%, 10%, 15% and 30% by weight of sand-fine mixtures. Sands and fine contents were mixed and compacted following Standard Proctor compaction method. For fine content of 5 to 15%, experimental results show that the maximum dry density of sand-fine mixtures increases with increasing fine content and decreasing its plasticity. The optimum water content decreases with increasing fine content and decreasing its plasticity. Multiple variable mathematical equations were developed based on experimental results and can be used to predict maximum dry density and optimum water content of sands. Verification of the equations was conducted and it was found that maximum dry density and optimum water content can be fairly predicted by these equations.