Estudo da influência da variação de umidade pós compactação no comportamento mecânico de três solos típicos de subleitos rodoviários brasileiros

Abstract

This work evaluates the influence of the variation of post-compaction humidity and of the suction in the mechanical behavior of three soils, through triaxial tests of repeated loads. The tests were carried out on specimens compacted at optimal humidity and subsequently submitted to saturation or air drying. In order to evaluate the suction, the retention curves were determined through tests carried out in the HYPROP and Richards Extractor equipment’s. Additionally, with the results obtained, simulations were performed in the MeDiNa program in order to evaluate the effects of post-compaction moisture variation on pavement design. It was found that air drying caused a small reduction in permanent deformations, while saturation produced a significant increase, contrary to the behavior observed for the resilience modulus tests. In addition, it was found that with the addition of suction, the resilience modulus increases and the permanent deformation decreases. In the design of pavements, it was observed that the addition of post-compaction humidity can make a pavement, designed with parameters obtained in the optimal humidity, reach the percentage of cracked area and/or maximum wheel track sinking recommended by the program before the end of its useful life. Furthermore, this work contributed to the expansion of the database of the MeDiNa program, mainly by incorporating humidity conditions different from the optimum