Estabilização granulométrica e química de areias eólicas aplicadas na construção de estradas rurais

Abstract

In the southwest region of the state of Rio Grande do Sul there is a phenomenon called arenization, the result of natural physical processes of geological formations and also by processes caused by improper soil management in the region's agriculture and livestock. Another occurrence of this region is the municipal dirt roads in poor condition, either due to lack of maintenance or overloading at harvest time. Rice cultivation, which through the processing industries produces an important waste, Rice Husk Ash (RHA), which if disposed of incorrectly can bring serious environmental problems. Given this, the work seeks, through physical stabilization, with thin soil, and chemical stabilization, with a thin soil and the RHA, to study the geotechnical utilization of the sandy soils, aiming its use in rural roads. Aeolian soil-thin soil- RHA mixtures were used in the proportions of 75% wind soil (Ae) + 25% thin soil (Sf), 80% Ae + 20% Sf, 85% Ae + 15% Sf, 75% Ae + 20 % Sf + 5% RHA, 80% Ae + 15% Sf + 5% RHA, 85% Ae + 10% Sf + 5% RHA. The laboratory tests performed were dynamic compression, California Bearing Ratio (CBR) and Unconfined Compressive Strength (UCS). With the results it was concluded that the RHA decreases the compacted dry mass of the mixtures and in these, with higher content of the fine fraction in the mixture with RHA, higher values of UCS were obtained (75% Ae + 20 % Sf + 5% RHA). Related to CBR, the mixtures did not reach considerable values to be used as a base or subfloor, but their values are sufficient to be used as a road subgrade.