Experimental Study on Guabirotuba’s Soil Stabilization Using Extreme Molding Conditions

Autor: Jair de Jesús Arrieta Baldovino, Fernanda Feltrim, Ronaldo Luis dos Santos Izzo, Érico Rafael da Silva
Rok vydání: 2020
Předmět:
Zdroj: Geotechnical and Geological Engineering. 38:2591-2607
ISSN: 1573-1529
0960-3182
DOI: 10.1007/s10706-019-01171-x
Popis: The porosity/cement ratio (η/Civ) was employed in this research to study the evolution of unconfined compressive strength (UCS or qu) and split tensile strength (STS or qt) of a silty soil stabilized with cement in several molding conditions not shown in the literature. Five molding moisture contents (ω) fixed between 14.67 and 33.34%, three dry unit weight of molding between 13 and 16 kN/m3, four cement contents (C) between 3 and 9% (by dry mass of the natural soil) and a curing time of 28 days were used to study the influence of η/Civ on qt and qu under normalized conditions. With the increase in dry molding unit weight and cement content, as well as reducing the initial porosity of the samples, qu and qt strengths increase for all mixtures. On the other hand, qu and qt also increase potentially depending on the η/Civ ratio, adjusted to an exponent of 0.44, which remained constant for all molding conditions. The η/Civ ratio was able to establish empirical ratios between qt/qu, which obtained values between 0.135 and 0.163 and which depended on the moisture content used during compaction. Regarding molding moisture content, there was an augment in qu and qt, with an increased molding moisture content up to 28% (converting into an optimum value) using the η/Civ ratio in normalized terms. After ω = 28%, the strength of the mixtures was reduced. Finally, two equations to dose and estimate qt and qu were obtained, set to 96.5%, and with a 6% error. Thus, all strengths showed the same normalized potential trend as a function of ω, compatible with the value of η/Civ0.44 = 35.
Databáze: OpenAIRE
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