Strength and dilatancy of a silt stabilized by a cement and fly ash mixture

Abstract

The mechanical behaviour of a weakly cemented silt was studied experimentally. The cementing agent was a cement and fly ash slurry, and the samples so formed were slightly cemented. In triaxial testing, both drained and undrained tests on saturated samples were conducted. Special zero effective stress tests were conducted to measure, directly, the contribution of bonding between grains to the enhanced strength and stiffness. The cemented soils were initially less dilatant than their respective parent soils but eventually became more dilatant than the parent soils. The shear strength data followed a curved failure surface that merged back, at high stress, into that of the parent soil. This feature can be captured by a failure function that models the contribution of cementing agent to strength as two parts, true bonding and increase in dilatancy rate at failure. Both parts degrade with an increase in confining stress, but at different rates.Key words: bonding, cemented soil, dilatancy, strength, triaxial testing.

Cement-Stabilization of Sabkha Soils from Al-Auzayba, Sultanate of Oman

“…This indicates a dilatant behaviour at failure. Similar results were reported by Lo and Wardani (2002) for cemented silt.…”

“…Similar results were obtained by others (Clough et al 1981;Reddy and Saxena 1993). Lo and Wardani (2002) reported that the change in the effective strength parameters of a cemented silt is dependent on the confining pressure. For moderate confining, similar to the one used in the current study, they found that the CSL for cement-treated soil is parallel to that of untreated soil (i.e.…”

Experimental investigation of thermal and mechanical properties of lignin treated silt

“…Chemical stabilizing agents (such as cement, lime, fly ash, gypsum, and other calcium-based materials) have been used extensively for improvement of the soils with poor engineering properties by earlier researchers (Bell, 1996;Lo and Wardani, 2002;Hebib and Farrell, 2003;Sariosseiri and Muhunthan, 2009;Cuisinier et al, 2011;Rahardjo et al, 2013). The engineering behavior of treated soils has been improved dramatically by using these agents.…”

Use of lime and cement treated soils as pile supported load transfer platform

“…The mechanical properties of cemented soils have been investigated by various authors (Horpibulsuk et al, 2003, Horpibulsuk et al, 2004, Kamon and Bergado, 1991, Kasama et al, 2000, Lo and Wardani. 2002Lorenzo and Bergado.…”