Influence of Molding Moisture Content and Porosity/Cement Index on Stiffness, Strength, and Failure Envelopes of Artificially Cemented Fine-Grained Soils

An effort is being carried out to encompass the influence of molding moisture content ($\omega$) on the dose procedures aimed at binder enhanced fine-grained soils built on sound criteria. The porosity/cement index ($\eta /C_{iv}$) plays an essential role in initial shear stiffness ($G_0$), tensile ($q_t$), and compressive ($q_u$) strength, and triaxial failure envelope parameters determination. This study aims to assess $G_0$, $q_t$, $q_u$, $q_t/q_u$ and $G_0/q_u$ relationships of fine-grained soils treated with distinct cement amounts, distinguishing dry densities and different molding moisture contents to show that the effect of distinct structures because of the influence of moisture content and the porosity/cement index play a major function in establishing stiffness and resistance of fine-grained materials. The ruling factors assessed were molding moisture content and adjusted porosity/cement index. Ultrasonic pulse velocity, unconfined compression, split tensile and drained triaxial tests were performed in current research. Higher values of parameters $G_0$, $q_t$, and $q_u$ are observed with the rise of binder content and reduction of porosity of the compacted mixture. In addition power functions are used to represent these interaction diagrams relating $G_0$, $q_t$, or $q_u$ with cement content or porosity/cement index. Therefore, the porosity/cement index is shown to be suitable to evaluate $G_0$, $q_u$, and $q_t$ of the fine-grained soil-binder blend studied. $q_t/q_u$ ends to be independent of parameters $\eta /C_{iv}$ and $\omega$ for the fine-grained soil-cement studied. Distinctive relations between $G_0/q_u$ and $\eta /C_{iv}$ of the silt-cement mixtures are presented for every moisture content considered, connecting stiffness and resistance.