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Stabilised Base with Soil-Cement for Unpaved Roads “Ruta Del Cacao” (Guayas, Ecuador)

Abstract:

Soil-cement has been a constructive method that has contributed to the stabilization of roads, where the soil is mixed with cement, providing an improvement in the physical and mechanical characteristics of the roads, and can be applied to any type of soil. It is necessary to consider that due to the experience of projects executed using this method, it has been possible to work more efficiently during their evolution, both in equipment and in construction procedures. The soil-cement structure supports a greater load, since the stress is distributed over a larger area, thus avoiding greater vertical deformation in the subgrade, which provides a longer useful life. The cement dosage required for the stabilization of this study depends on the material in situ, for which the soil is classified using the AASHTO methodology, it is depending on the soil characteristic, the required cement range is obtained. This study seeks to obtain the least amount of cement necessary to carry out an adequate design considering the traffic, environmental conditions and price. To achieve cement optimization, tests are carried out with a lower dosage and a dosage within the range stipulated by the PCA Design Methodology for soil-cement mixtures (ACI, 1997). After comparing the results of the tests, design and budget, a dosage of 6% of cement by required weight is chosen, which yields a resistance to simple compression strength greater than 24.5 kg / cm2, a road structure made up of the subgrade, the improvement material found on site of 15 cm and the soil stabilized with cement of 25 cm. Due to the fact that this project is carried out with the material in situ, it is friendly to the environment since it avoids the exploitation and transport of materials from other sources.