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Soil improvement techniques as part of the design of transmission towers’ foundations are being studied by the market. Considering the admixture of these materials can be performed by surface mixing, the cement and fibers show potential application in construction sites with difficult access, in which the use of large equipment is unfeasible. In order to make this alternative applicable, it is necessary to understand the complexity of calibrating a dosage method, due to the numerous mixtures’ variables. With the objective of predicting the strength of improved soils with polypropylene fibers and type III cement, previous researchers have developed an equation which ties the amounts of these materials to the unconfined compressive and tensile strength of the mixtures. This equation is adjusted by an external coefficient named Îś. The assessment of some of the key factors that influence the value of Îś was done by the following research. Results suggests the tensile strength of the polypropylene fibers and the curing time of the specimens do not have an influence on the coefficient value. When compared to unimproved soils, the addition of 0.5% polypropylene fibers alone did not result in significant gains in tensile strength (11%) but provided an increase in soil ductility. The combined addition of polypropylene fibers and cement resulted in significant gains in both unconfined compressive (up to 700%) and tensile strength (up to 480%).
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