Influência da qualidade da cal (envelhecimento) na estabilização de solos lateríticos.

Abstract

The stabilization of lateritic soils is usually done with lime. Neverthelen, the aged effects of hydrated lime »iiL the stabilization are not well known. The aged accurs by the action of CO- of air in a carbonation reaction during storage. The study presented here deals with the effects of two limes (new, aged), in the stabilization of three lateritic soils of Paraíba State. The characterization an thechnological test were caried and following the methodology of laboratory of mineral Analysis of CCT and of DNER. he following properties of soils-lime mixtures ( (for three soils and two lime) with 0% , 31, 6% and 9% cf lime and cure periods of 7, 14, 28 and 56 without imersion and three different moisture contents for moulding were studied. For determination of simples compression strenght of soil-lime and later on the obtain ideal percentage of lime test structrus: were prepared, aged and tested. After cure periods, simples compression tests were carried out to study the influence of lime percentage, cure time and minimum quantity of lime necessary for adequate value of simples compression strenght. With the results obtained, it may be verified that lime quality is fundamental in the road stabilization. Because of demaging effects caused by the use of aged lime and the fact that such effets are frequently neglected during the execution of road sections, a sistematic control of lime quality must by carried out. In namy of the cases studied maximum simples compression strenght was obtained, therefore additional use of lime quantity is necessary. The results are limited to the studied materials and hence extrapolation withaut specific verifications can not he made. More details about the present research are presented in the course of this study.