Estudo da estabilização química de solos para o uso em comadas de pavimento, na cidade de São Luis-MA

Abstract

The main objective of the pavements is to offer security and comfort to its users, supporting the efforts and bad weather throughout its life. However, the lack of paving quality in Brazil is a routine problem and can be caused by poor condition both in the coating and in its subsequent layers. Having the stabilization as a way to solve this problem, giving a greater mechanical resistance as much as a longer shelf life. The present work presents the study of a soil stabilized chemically with cement, where the mechanical behavior of the soil-cement mixture for the use in layers of pavements was evaluated. The materials involved in the research were sandy soil, rated A-2-4 according to the Transportation Research Board (TRB), Portland cement type CP II-Z 40. The methodology covered the mechanical strength tests of the mixture, Soil characterization was extracted from Torres (2017). With the research developed in the Laboratory of Soils and Pavement (LSP) of the State University of Maranhão (UEMA). In the simple compressive strength test (RCS) the specimens were molded into the normal Proctor energy in three cement contents (4%, 6%, 8%), taking advantage of the optimum moisture results found in the compaction test. It was possible to verify a good reactivity between the soil and the cement used, mainly due to the affinity between sandy soils and Portland cement, thus presenting satisfactory results regarding the mechanical resistance of the mixture. The RCS test evidenced an increase of resistance, with increase of cement content and curing time. The 4% cement content would already be sufficient to give the soil adequate resistance to be used in the base layer of pavement