Dosagem de solo-cimento para reforço de base de fundações superficiais.

Abstract

Stabilization with soil-cement is one of the possibilities for construction of buildings in regions of soil with low support capacity. The mixture of the local soil with cement, properly dosed and compacted, acquired resistance and presents durability compatible with the necessary criteria for the constructions. In this work, the chemical stabilization of a clayey sand with the use of Portland cement of high initial resistance (CP V - ARI) was studied as a base reinforcement of shallow foundations isolated by the methodology of /Civ. The study focused on the design of the shallow foundations from the geotechnical profile of the soil, as well as on the calculation of the natural and improved soil loading capacity, through calculation methods obtained in the literature and the /Civ dosage curves from the results of the unconfined compression test for soil with 4%, 6% and 8% of cement and dry density of 14, 15 and 16 kN / m³, and finally, in the definition of the budget of the shallow foundation seated in natural soil and improved soil. The shallow foundation was designed to withstand a load of 187.3 tons centered on a pillar of dimension 80 x 35 cm, coming from data of the construction of the technical school of Campina Grande-PB, where this type of solution was adopted. Both shallow foundations were dimensioned for settlement at 2.00 m depth. The shallow foundation over natural soil requires dimensions of 190x80 cm to be able to support the load of the abutment, while the shallow foundation over cemented soil needs dimensions below recommended by ABNT NBR 6122: 2010, being adopted for this case a shallow foundation of 140x60 cm, generating a cost reduction of 44%. This result is due to the smaller dimensions required for the shallow foundation seated in soil-cement and consequent reduction of the quantitative of materials