Environmental Effect of Adding Zeolite and Sawdust on the Unconfined Strength of Stabilized Sandy Soil by Cement

Nowadays unlike decades ago, environment plays decisive role for using materials in construction. For example, one considerable part in a project is exploring environmental aspects as a preparatory topic. Chemicals such as cement have been used for decades in construction projects, however chemicals will lead to health catastrophe for both environment and human consequently. One considerable hitches in human life is waste materials such as sawdust which will jeopardise environment. One solution to alleviate these problems is using wastes in construction projects as substitution for cement. In this research, sawdust and zeolite were used to decrease cement use on sandy soil's improvement. Amount of materials are as follows: 4% cement (base on main soil weight), 0,1,3 and 5 % sawdust with two different sizes include powder and fibers (as supersede by cement) and 0, 10, 30 and 50 % zeolite as a supersede by cement. Results showed that zeolite and sawdust increase OMC but decrease MDD. Zeolite meets its optimum in 30% and powdered and fibrous sawdust in 3 and 1% subsequently. Finally, rupture strain will experience a sharp increase by enhancing amount of sawdust. Overall it can be concluded that longer sawdust is more effective than short one.