محمد قدسيان

Most of the produced mineral wastes have the potential to be used in road construction. The main purpose of this study is to use these travertine stone filter press wastes to stabilize the sub-base in road construction as cheap local materials and eliminate their negative environmental effects. In this article, filter press waste and lime were combined with the percentages of 0%, 5%, 10%, 15%, 20% and 0%, 2%, 4%, 6%, 8% of the dry weight of the materials with the sub-base, respectively, and the experiments Different methods were tested to find the optimal percentage for stabilizing the weak foundation. In the process of tests, first the obtained samples were subjected to Proctor's density test and their maximum dry density and optimal moisture content were measured. Then the structural parameters of the sample, such as the load capacity of the sample, internal friction angle and adhesion, compressive strength in the form of California bearing ratio tests, direct and uniaxial cutting to eva‎luate the properties of stabilized and unstabilized sub-base have been done. Then, the results of different mixtures were compared to see the effect of additives on subbase stabilization. The results showed that mixing the substrate with filter press waste increases the maximum dry density and decreases the optimum moisture content. Also, tests of unconfined compressive strength (UCS), California bearing ratio (CBR) and direct shear showed that optimally adding 15% of stone filter press waste along with 8% of lime to the sub-base increases the life of the pavement by about 20%. On the other hand, the addition of more than 15 percent by weight of filter press waste decreased UCS, shear strength and CBR.

ضايعات فيلتر پرس , آهك , زيراساس , طول عمر روسازي

Filter press waste , Lime , Sub base , Pavement life span

mohammad ghodsian

Hassan Ziari