Análise do comportamento físico e mecânico do solo do Câmpus Universitário de Várzea Grande adicionado de cimento CP II Z32

Abstract

This study investigates the physical and mechanical behavior of the soil at the Várzea Grande University Campus, stabilized with Portland cement CP II Z32. The objective was to assess variations in expansion and strength through California Bearing Ratio (CBR) tests. The saprolitic soil sample, typical of the Baixada Cuiabana region and derived from phyllite parent rock, underwent grain size distribution tests, Atterberg limits, and compaction at different energy levels, followed by mechanical evaluations. Results indicated significant improvements in mechanical properties with the addition of cement. A 4.5% dosage achieved a CBR value of 193%, compared to 18% for untreated soil. However, economic analysis pointed to a 2.5% cement dosage as the most efficient, meeting DNIT standards and avoiding waste. Unexpected expansion at the 3.5% proportion was attributed to the high reactivity of the soil's clay fraction, as suggested by Skempton's activity index (1953). The study confirms the feasibility of cement stabilization for pavement applications and its contribution to infrastructure projects in regions with similar geological characteristics. The research also highlights the importance of balancing technical efficiency and economic sustainability. Further investigation is suggested with lower cement dosages and the evaluation of natural additives as sustainable alternatives to minimize environmental impact.