Influência da área específica na atividade pozolânica do sistema solo laterítico-cal.

Abstract

Previous works show evidence that the behaviour of the lateritic soils are straight related with some intrinsic properties. It is observed that such properties are not sufficient to explain some behaviour of these soils. For this reason, or extensive and detailed study has been doing looking for better knowledge of the microstructure of these materiais, in order to have a good comprehension of their behaviour and/ or performance in engineering. With objective of to know well the pozzolanic proper ties of the lateritic soils when using the system soil-lime, it has been studied sixteen samples of the lateritic soils from North and Northeastern regions of the Brazil. These soils were studied at natural state and with additions of the 3,0%, 6,0% and 9,0% of lime; following cure at humid chamber with 100% of humidity and room temperature of 22ºC for curing time of 7 days, 28 days and 60 days. After curing time the samples were tested through simple compression strenght and Califórnia Bearing Ratio. At the same time were determinated the specific surface, using the fine fractions of lateriticsoils by the methods of permeameter of Blaine and Fisher. From these results related to specific surface, simple compression strenght and Califórnia Bearing Ratio. Were carried out a statistical analysis through simples correlations (linear, logarithm, exponential and powers regressions) and multiple linear regression. The studies show to exist correlation with high level of significane between specific surface and simple compresion strenght. The best results were obtarned on soils with 6,0% of lime and curing time of 28 days. Also, do not show significant correlations between specific surface and Califórnia Bearing Ratio. It could be an evidence of the limitation of Califórnia Bearing Ratio test. From these results it is observed that the determination of specific surface by the permeameter methods of Blaine and Fisher con be used as auxiliary data for predected of lateritic soils move adequated to be used with lime as additive when submitted to a systematic proposed by Thompson (1966).