Influência do teor de umidade, da porosidade e do intervalo de tempo até a aplicação da mistura solo-cimento em pavimento rodoviário

Abstract

In this paper it intends to evaluate the moisture content, porosity and time lapse until the application influences over their unconfined strength of soil-cement mixtures. They were made three groups of laboratorial tests, over compacted soil-cement mixtures, using 6 and 7 % Portland cement. In the first group, the dosage mixture was made under the optimum humidity (optimun) and Proctor normal energy. In the second group, the dosage mixture was made under the optimun + 1 % and Proctor normal energy. In the third group, the dosage mixture was made under the optimun + 1% and altered Proctor energy. These conditions were adopted for moisture content influence verifications. Over each dosage mixture, the compac-tion was made after 10 time lapses between the until application works, varying for 0 min to 6 h, to verify in the mechanical performance, the influence of the time lapse until the application influences. The results appointed to the unconfined strength decreasing for the increasing time lapse until the mixture application and this time lapse was limited for the 21 kg/cm² minimum unconfined strength required, varying according to the cement content, moisture content and compaction energy. When the compaction was made with the optimun + 1 %, the unconfined strength obtained was higher, for the same time lapse until application. For all dosage mixtures was verified that the better mechanical performance occurred to the lower mixture porosity.