Laboratory study on the effect of sawdust ash and zeolite replacement on sandy soil stabilized by cement

Nowadays cement is one of the most common material for construction projects, due to its long time usage it has been handy for engineers. Cement has a lot of deleterious effects on environment from production process to cement itself. So looking for a substitution material is vital for future generation, this research evaluated the effect of zeolite and sawdust ash (SDA) replacement with cement separately and simultaneously. There are some variation parameters: the amount of zeolite and sawdust ash and curing time for each sample. Overall 57 samples were made the amount of cement is 4% by weight of base soil and 0, 0.5, 1, 1.5 percent sawdust ash replaced by cement and 0, 10, 30, 50, 70 percent of zeolite replaced by cement. The curing times are 7, 14, 28 days. According to results by replacement 0.5% sawdust ash with cement the amount of optimum moisture will increased and in higher amounts of sawdust ash it will decrease. Also dry density will decreased. Unconfined compressive strength (UCS) test data shows that optimum amount of zeolite and sawdust ash replacement with cement are 10% and 0.5% respectively. These optimum amounts make compressive strength increased 250.46 and 245.01 percent respectively compared with base soil and 73.9 and 87.42 percent respectively compared with stabilized sandy soil with 4% cement only.