Influência da fração vermelha do resíduo de construção civil com cal na estabilização de um solo da formação Guabirotuba para pavimentação

Abstract

In 2014 Brazil had about 1.7 million kilometers of road mesh network extension, of which only 12.1% was paved. One of the reasons for this low number is the high cost in the paving process caused by several factors, including the need to stabilize the soil for the sub-base of the highway. This research aims to contribute to the increase of road paving in Brazil, by reducing the cost of stabilizing soils with low support capacity. Several tests were carried out to characterize the soil and the red fraction from the Residue of the Civil Construction, such as Granulometric Test, Grain Actual Density, Atterberg Limits, Fixed Calcium Hydroxide Content, X-ray Diffractometry (XRD), Spectrometry of X-ray Fluorescence (FRX) and Compaction. Also, molding and curing of specimens, single compression strength tests (RCS) and California Support Index (ISC-CBR) were performed. This demonstrates the need for the soil to be replaced by another with higher ISC or to undergo a stabilization process. The soil was also classified as silica-silty granulometry group A-5 typical of silty soils moderately plastic and with presence of mica. As for SUCS, the soil is classified as clay with low sandy plasticity. In the results of the Simple Compression test, a resistance of 1.09 MPa wasreached that is lower than the value stipulated by the Paraná Department of Roads and Rolling (DER-PR). Finally, Statistica Software showed that, theoretically, with the addition of 10% of lime and 26% of red fraction, the criterion of resistance to the simple crisis of the DER/PR.