Verificação da resistência ao cisalhamento e estabilidade de taludes de um solo natural e melhorado com cimento, cal e cinza da casca de arroz

Abstract

The study investigated the technical feasibility of improving the region a solo chemically extracted from a deposit located in Alegrete / RS. The soil was characterized and improved with the addition of lime, cement and rice husk ash (RHA). The lime and cement are widely used in soil improvement , the difference is the inclusion of percentages of CCA that is in the group of large volume waste generated annually and are often improperly disposed of in the environment , without any technical criteria, or require high costs for storage and disposal . Samples were compressed in the normal CPs with Proctor test power of the natural ground and blended with additions of 10 % lime + 15 % OA 10% Cement + 15% CCA. These traits were chosen because, exhibit unconfined compressive strength (RCS) exceeding 2.1 MPa, minimum value stipulated by DNIT for applying improved layered base floor soils. The direct shear tests were performed with samples in flooded condition in all traits , the undisturbed samples were molded from CPs molded in the normal Proctor energy and after the curing period of 7 , 14 , 56 and 112 days . The results show the strength gain with the addition of chemical agents, both in friction between the particles and the cohesive intercept. Having the strength parameters typical slopes of feeder roads were modeled and verified the stabilization with different vehicular traffic and geotechnical conditions.