SOIL STABILIZATION WITH LIME AND BITUMEN
How this technical can be easily applied in the brazilians soils used to pavements constructions.
In this work the authors have studied the validate of chemical stabilization of soils, typical of Vicosa country, with lime and bitumen to be applied in highways pavements, one of many researchs studies developed at Civil Engineer Departament of the Vicosa Federal University.
In the first step of the project, studied the efficiency of the lime-bitumen-soil stabilization in a red-lathossoil, with abundant argillaceous characteristics, that has not adapted in the geotechnical specifications propers for soil-bitumen mixtures. Has utilized lime with low quantity to make the plasticity break, changing the grain size distribution of the soil turning, thus your structure more granular putting in the specifications to the soil-bitumen, proper to granular one. To each lime quantity, was utilized slow rupture asphalt emulsion (RL-1C) with different percentual, varying a 2% to 8% in relation of the dry specific mass of the soil.
In the second step, was investigate the same quantity of lime and bitumen to a different soil (saprolitic soil) that have high micaceous quantity in your mineral structure. Thus, it have a high expansion measured in C.B.R. (California Bearing Ratio) tests that not put itself in the brazillian highways specifications (upper 2%).
The results show that the lime-bitume-mixture have more research because the ideal proportion to the mixture varying to each soil type. But, the lime influenced in the mechanical stranght and the bitume make a increase in the soil plasticity.
More studies need changing the sampling metodologies, increasing the statisticals samples analisys arround optimum humidity and curing ones through acelerated conditions by specifics high enviroment temperature. Firstly, the lime-soil mixtures need to more time to make a strongly pozolanics and cementations links with the soils studied.
I was tried to told you since 1994 but, you didn't hear me...
The complete paper was published in the SIC/UFSCAR at Sao Carlos Federal University (Sao Carlos-SP) (1995)
Marcelo Ferreira dos Santos - Doctor Science in Geotecnical Engineering at Viçosa Federal University (Minas Gerais State, Brazil).