Aplicação do método de dosagem físico-química na determinação do teor mínimo de cimento para estabilização de três tipos de solos da formação Guabirotuba de Curitiba - PR e região metropolitana

Abstract

In this study, the physical-chemical dosage method provided by DNIT was explored to determine the minimum cement dosage for soil stabilization. Three silty soils from different regions of the city of Curitiba and its borders, belonging to the Guabirotuba Formation, were analyzed. For this purpose, analyses were conducted to characterize the soils, including compaction, particle size distribution, and consistency limits. Additionally, the soil behavior was examined in terms of chemical stabilization with Portland cement, considering the perspective of pavement recycling. The percentage used by the Curitiba City Hall for this purpose was also analyzed, revealing that a constant value does not seem to be the best option from the physicochemical stabilization standpoint. As a result of the minimum cement content, it was found to be 2% for the pink-colored soil, 4% for the red-colored soil, and 9% for the yellow-colored soil. The results indicate that, in the context of chemical stabilization, only the soil-cement mixture of the yellow soil meets the minimum strength requirements for sub-base and base according to Brazilian standards, although this value is very high and environmentally unfeasible. This study contributes to understanding the properties of these soils, particularly the minimum cement content, and provides valuable insights for pavement engineering.