Aplicação de solo eólico para construção de tijolos maciços

Abstract

The objective of this work is to study the geotechnical improvement of a aeolian soil with incorporation of cement and rice husk silica (RHS), for the manufacture of solid bricks. To do this, samples of the aeolian soil were initially collected and geotechnical characterization tests were performed in the laboratory. After that, tests was carried out to evaluate the soil-cement-RHS mixture, in the proportions 88%-12%-0%, 80%-10%-10%, 80%-12%-8%, 85%-7.5%-7.5% and 80%-8%-12%. Thus, each of the proportions of the mixture was subjected to compaction tests by the Proctor method, enabling the confection of cylindrical specimens. After a curing time, compressive strength tests were applied to the cylindrical specimens. The adherence adhesion capacity in the molding of the cylindrical specimens and the results of compressive strength were determining factors in the choice of three proportions of soil-cement-silica rice husk, to be used in the manufacture of solid bricks, being 80%-10%-10%, 80%-12%-8% and 80%-8%-12%. The soils bricks were made to accordcance NBR 8491/12 and their molding occurred with using a metal mold of dimensions of brick type A (20.0 cm x10.0 cm x 5.0 cm), in an industrial hydraulic uniaxial press of SIWA, with a capacity of 100 tonnes. After, the bricks were placed in a humid place, in the shadow and with wetting cycles to maintain humidity for a curing period of 28 days. Finally, in order to evaluate the quality of the bricks as required by national standards ABNT NBR 8491/12 and 8492/12, theses were submitted to control tests, such as compressive strength tests and water absorption tests. The three proportions (80%-10%-10%, 80%-12%-8% and 80%-8%-12%) of the mixture used in the manufacture of solid bricks, met the requirements of the aforementioned standards, with an average compressive strength greater than 2.0 MPa and water absorption below 20%. Keywords: Soil-cement. Silica of rice husk. Simple compressive strength.