Efeito da umidade inicial e do tempo de cura nas propriedades mecânicas de misturas solo-cimento

Abstract

The soil-cement is commonly used as a base course material for pavements, especiallywhere there are limited sources of coarse aggregates. In the mixture design process, it is verified the minimum value of compressive strength after 7 days of curing. The standard mixture procedure is to incorporate the cement to the soil at the hygroscopic humidity. In this study, another mixing process was also investigated, where the soil humidity was kept the same as collected, in order to simulate the mixing procedure in the field. The evaluation was done through the impact compaction, and also mechanical tests, as, triaxial resilient modulus (RM), compressive strength, and indirect tensile strength, for four curing times (7, 14, 21 e 28 days). The results have shown the influence of the initial mixing humidity in the volumetric and mechanical parameters of the soil-cement mixtures. The experimental test site data were compared to the laboratory ones through backcalculation, and the RM from the field data were smaller that the RM from the laboratory, probably due to the initiation of microcracking phenomenon and constructive issues. Also, one may add the differences in the way the humidity is adjusted in the field and in the laboratory.