Effect of sand equivalent (SE) on strength of soilcement-fibre matrix

Soil-cement is a mixture of Portland cement, soil and water that sticks together due to the hydration of the cement and compression of its components to create a dense, durable compound, which has low permeability and is resistant to erosion. Unfortunately, these mixtures do not perform well under tensile load because soil-cement materials are brittle. In this study, three types of fibres were used to reinforce the materials to compensate for this flaw: jute, polypropylene, and steel fibres. These fibres were randomly added to the soil- cement mixture in three percentages (۱, ۲, and ۳%). Tests were then conducted on three different soil-cement gradations each with three fine contents of different mineral types . First, sand equivalent and Atterberg limits were conducted on the soil samples. Then indirect tensile strength and flexural tests were conducted on the soil-cement samples in two conditions: control (unreinforced) and reinforced soil-cement samples. Results showed an undeniable role of fibres in changing the behaviour of the soil-cement-fibre matrix from brittle to ductile producing post-peak behaviour.

کلیدواژه ها:

Soil-cement ، Tensile strength ، Flexural strength ، fibres.