Shear strength of microfine cement grouted sands

Abstract

Unconsolidated–undrained (single and multi-stage) triaxial compression tests were conducted to evaluate the shear strength of microfine cement grouted sands. Microfine cements of three different types were obtained by pulverising ordinary cements produced in Greece. Multi-stage triaxial compression tests can be used dependably for determination of the shear strength parameters of cement grouted sands. It has been observed that the Mohr–Coulomb failure criterion represents adequately the behaviour of the grouted sands. Grouting with microfine cement suspensions improves the strength of sands significantly, and the improvement is primarily controlled by the water-to-cement (W/C) ratio of the suspensions. The positive effect of microfine cement grouting on the shear strength of sands is mainly the addition of cohesion, which is substantial even at a distance of 1·2 m from the injection point. Grouting with suspension, using W/C = 1 provides the sand with cohesion of about 2·6 MPa. The shear strength parameters vary with axial strain, and cohesion attains a maximum value well before failure.

Prediction of Unconfined Compressive Strength of Microfine Cement Injected Sands Using Fuzzy Logic Method

“…Zebovitz et al [7], Karol [1] and Warner [8] stated that grouting could be performed easily for materials ranging from microfine cements to fine sands. Christodoulou et al [9], Markou and Droudakis [10], Hashimoto et al [11] observed that the strength of the sands increased after microfine cement was injected. Schwarz and Krizek [12] and Avci [13] suggested that the permeability coefficients of sands decreased after injecting microfine cement.…”

Prediction of Unconfined Compressive Strength of Microfine Cement Injected Sands Using Fuzzy Logic Method

“…Zebovitz et al (1989), Karol (2003) and Warner (2003) stated that grouting could be performed easily for materials ranging from microfine cements to fine sands. Christodoulou et al (2009), Markou andDroudakis (2013), Hashimoto et al (2016) observed that the strength of the sands increased after microfine cement was injected. Schwarz and Krizek (1994) and Avci (2019) suggested that the permeability coefficients of sands decreased after injecting microfine cement.…”

Field testing of permeation grouting using microfine cement

“…Permeation grouting using sodium silicate solutions has also been widely applied for its mitigation effects on individual structures (e.g. Granata et al, 2015;Lirer et al, 2006;Tsukamoto et al, , 2007, while the use of microfine cement for grouting has also been developed and examined (Markou and Droudakis, 2013;Tunçdemir and Ergun, 2009;and others). However, with the recent advent of ultra-microfine cement, with particle diameters on the order of 1 μm (Kanazawa, 2012), it has become important to seek advancement in geo-technology for permeation grouting using such micro-scaled cement materials (Hashimoto et al, 2015).…”