Expansion evaluation of a soil of the municipality of Paulista-PE improved with lime

The effect of lime treatment on the proper- ties of Paulista expansive soil was investigated, comparing the behavior of natural soil and soil mixed with lime in the proportions of 3%, 5%, and 7% by weight. Physical, chemical and mineralogical characterization tests (by thermogravimetry (TG) and X-ray diffractometry), free expansion and expansion stress were carried out. The natural soil presented high expansiveness.

The determination of the expansion voltage was influ- enced by the voltage trajectory followed during the test. The addition of lime to the soil caused an aggrega- tion or flocculation of the particles and a reduction in the plasticity index. The addition of 5% of hydrated lime to the soil of Paulista stabilized in relation to the free expansion and the expansion tension.