Plasticidade de solos lateríticos: métodos de ensaios e efeito da temperatura de secagem.

Abstract

This dissertation presents the results of the plasticity study of sixteen lateritic soils from North and Northeast of Brazil, evaluating the test methods for the determination of liquidity limit (LL) and plasticity limit (LP) and the effect of drying temperature. A complementary study was developed in order to correlate the liquidity limits determined with Casagrande and penetration cone devices. The results allowed us to conclude that the test methods used were adequate to the soil types studied since they presented repeatability within the acceptable range, and the LL determined with the penetration cone showed a repeatability slightly higher than the LL determined with the device. de Casagrande, although the latter has also produced satisfactory results. A highly significant simple linear correlation was also found between the liquidity limits determined with the Casagrande apparatus and penetration cone. Regarding the effect of drying temperature, the results showed that the values ​​of the limits of liquidity and plasticity both increase and decrease, but with a tendency to decrease the plasticity index values. However, from a civil engineering standpoint, these increases or decreases were not significant.