Volume 19, No. 4, 2022
Cement And Lime Stabilized Sedimentary Silty Soil: Porosity/Cement Index Controlling The Split Tensile Strength
Jair Arrieta , Carlos Millan and Fernando Jove
Abstract
This work evaluates the development of silty soil's split tensile strength (qt) from the Guabirotuba Formation of Curitiba/BR artificially cemented over 28 days. For this, two binders were used: lime and cement. The lime used was hydrated dolomitic type, and the cement had high initial strength, added in percentages of 3, 5, 7 and 9% about the dry mass of the soil. Specimens of 50 mm in diameter and 100 mm in height were molded with different contents of lime (L), different contents of cement (C), different porosities (?), different apparent dry weights (?d), moisture of molding (?) between 20 and 23% and subjected to indirect traction under saturation conditions. The voids/lime (?/Liv) and voids/cement (?/Civ) ratio represented by the porosity/volumetric binder content ratio (?/Biv) was used to evaluate the development of qt in addition to variables such as L, C and ? and its influence on qt. The results demonstrate an increase in strength with increasing lime and cement content and with decreasing voids (i.e., higher dry specific weight and lower ?). In terms of addition, the soil-cement mixture developed greater tensile strength than the soil-lime mixture by 15%. Finally, a dosage equation for qt of the studied soil mixed with lime and cement was calculated using the ?/Biv ratio adjusted to an exponent of 0.20 for cement and lime, obtaining an acceptance of 95% and a mean error of 4%.
Pages: 619-630
Keywords: Soil stabilization, porosity-binding, tensile strength.