Caracterização e estabilização de um solo na cidade de Alegrete/RS com cimento Portland e cinza de casca de arroz

Abstract

In Brazil there are serious environmental problems about the constant generation of agroindustrial wastes which cause harm to the environment. The rice beneficiation process generates large amounts of rice husk and these residues are generally deposited on land causing environmental degradation due the slow biodegradation, so its use in engineering works can contribute to the conservation and preservation of the environment and provide a final destination suitable for the rice husk ash (RHA). In this study were investigated diferente mixtures of soil-cement-rice husk ash. The soil is from a field located within the county of Alegrete, RS. The main objective of the research was to study the characteristics of diferente mixtures of soil-cement-ash in order to determine an average compressive resistance equal or larger than 2,1 MPa in 7 days, as a criteria required by the DNIT and the dosage soil cement norm - NBR 12253/92. Starting from the study of similar cases already developed, experiments were performed as: dosage of mixtures, molding the specimens, characterization tests, the intermediate compaction of Proctor energy and simple compression tests. These tests allowed to assess the performance of local soil and soil improved with the inclusion contentes of 6%, 10% and 13% of cement (in weight) to the soil and additions contents of 5%, 10% and 15% of ash (in weight) in the mixture soil + 10% cement. It was concluded that concentrations of 6% cement incorporated in the soil were sufficient to promote a minimal stabilization, resulting in resistance values. And the joint use of rice husk ash with cement presented technical potential for soil stabilization and may have economic advantages in their use as base material and road sub-base.