Estabilização de solo argiloso com adição de cimento e cinza de casca de arroz

Abstract

With the increase in world demand for food, efforts have been made to increase cultivated areas and productivity, with the use of new production techniques, development of equipment and agribusiness management methods. However, the cultivation and processing of production has generated a series of environmental problems, generating a very large amount of waste, many of which do not have a proper use, being discarded, often incorrectly. In view of this environmental perception, in this work it was roposed to use the gray rice husk byproduct (CCA), derived from abundant agricultural waste, which without an appropriate final destination is an environmental liability, adding value to it, and in a way, the exploration of natural deposits used for the production of cement, in addition to using the soil, an abundant resource, with the addition of cementing material, in order to reduce construction costs. This work aims to assess the mechanical behavior (compressive strength) of a clayey soil stabilized by adding cement and rice husk ash (CCA), checking through bibliographic research and investigating through laboratory tests, whether CCA provides better resistance performance by adding the percentages of 4%, 7% and 10% cement and 5%, 10% and 15% CCA (by mass), to the soil, through the evaluation of specimens. The compaction tests proved that with the addition of cement and CCA to the soil, there is a reduction of the optimum moisture content and an increase in the maximum dry apparent density of the mixture. The best results with resistance gain obtained were with the contents of cement of 4%, 7% and 10% of cement for addition of up to 5% CCA, with significant gains in strength of the specimens, due to the improvement of the compressive strength of the soil-cement mixture, in order to provide the necessary characteristics for use as a stabilizing material in landfills. The results of the simple compression tests show that the natural soil, resists to a higher tension before the breaking in relation to the soil mixtures of up to 5% CCA, above that content the resistance of the soil decreases, due to the difficulty of interaction between the particles soil and CCA. As only cement is added to the soil, there is a gradual gain of resistance due to the increase in the cement content because more interactions of the particles occur, forming a cement layer due to the moisture in the mixture. There was difficulty in homogenizing the mixture and loss of resistance for the levels of 10% and 15% CCA respectively.