A influência de aditivos químicos em propriedades selecionadas e de engenharia de solos vermelhos tropicais do Norte e Nordeste do Brasil.

Abstract

Five lateritic soils from the North and Northeast of Brazil were studied in order to verify the effects of chemical additives (Cal, NaOH and NaCl) on selected and engineering properties. Initially, characterizing properties were determined such as: specific area, pH, o, CTC, organic matter, with chemical position, amorphous, real specific mass, particle size and mineralogical composition, etc. Subsequently, the influence of the additives considered, in various proportions, on the following properties was verified; Atterberg limits, dynamic compression and unconfined compression stress (RCS). Finally, correlations and statistical regressions were researched, although of limited validity due to the small number of soils studied. These interrelationships were intended to be used as auxiliary data in the justification of certain behaviors, and may eventually and with discretion be used to predict the behavior of other soils of the same physiography. After the studies carried out, the following overall behavior was observed for each of the additives: Sodium chloride (NaCl) proved to be a poor promising agent for improving the studied soil properties in relation to sodium hydroxide (NaOH), lime. and NaOH cal + traces, presenting discouraging results to add soil in the conditions of the present research. Sodium hydroxide (NaOH) has shown to be a promising agent for improving soil characteristics, although it has shown results lower than lime and lime + NaOH traces. Lime proved to be an effective agent to improve the plasticity characteristics, immersion resistance and load bearing capacity of the studied soils. Calcrophage of NaOH showed better results than lime and sodium hydroxide (NaOH) alone as a very promising agent for improving the previously described soil characteristics.