Abstract
Soil is widely used in road engineering works. However, it does not always satisfy the specifications for the pavement layers (bases, sub-bases, and subgrade reinforcement) in which it can be used, and it is necessary to look for alternatives so that the paving project is executed. Among the existing alternatives, it is mentioned: to accept the natural soil and adapt the projects to the limitations imposed by it; Remove the material and replace it with a better quality one or adapt the properties of the existing soil in order to create a material capable of meeting the project requirements. The latter is called soil stabilization, which is a cost-effective solution for the preservation of natural resources. For the lateritic soil of the Distrito Federal, it was chosen to perform stabilization with lime, which is an abundant and low cost material in the district. In this presentation, seven lime contents (1%, 2%, 3%, 4%, 5%, 6% and 7%) and two different types of quicklime (CHI and CHIII) were used. The soil characterization tests were carried out and afterwards the Compaction and California Bearing Ratio (CBR) tests of the blends were performed. Results obtained show that there was little variation in moisture content with values ranging between 33.01% and 35.80% for CHI and between 32.10% and 36.21% for CHIII. There was also little variation in dry density, with values ranging between 1.26 g/cm3 and 1.29 g/cm3 for CHI and 1.24 g/cm3 and 1.31 g/cm3 for CHIII. For values of CBR, there was gradual increase according to the percentage of lime content to the two types of specimens. These values of CBR ranged between 1.42% and 34.63% for CHI lime, and between 2.70% and 10.50% for CHIII lime. With this, it is concluded that, it is more advantageous to stabilize this type of soil with the hydrated lime CHI in order to obtain high values of CBR, which is an indication of the soil compaction characteristics.
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Barbosa, T.S., da Silva, L.G.L., de Jesus da Costa Farias, R. (2019). Geo-Mechanical Characterization in Laterite Soil Mixtures - Aerial Lime for Road Based Use in Federal District, Brazil. In: Hemeda, S., Bouassida, M. (eds) Contemporary Issues in Soil Mechanics. GeoMEast 2018. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-030-01941-9_17
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