Abstract
Production of sewage sludge have raised increasing concerns due to negative environmental effect. Sewage Sludge Ash (SSA) is used as a new type of additive for clay. Laboratory tests were performed on clay samples to study the mechanism of sewage sludge ash (SSA) and Hydrated Lime (HL) soil stabilization. Different SSA contents (0, 5, 10, 15%) and hydrated lime (0, 1, 3 and 5%) were added to the soil samples. 288 samples were prepared, and unconfined compressive strength tests were carried out. The samples were tested under optimum water content and also saturated conditions with three replications. The results of the coefficient of softening indicated that by adding SSA and hydrated lime to clay soil simultaneously, the stabilized clay soils can be applied in the moist and saturated condition. According to the results, the samples of SSA contents 0% with hydrated lime 5% and SSA contents 10% with hydrated lime 5% can be placed in the vicinity of moisture.
Highlights
Soft clay soil is one of the problematic soils covering considerable parts of the earth including many low-land and coastal regions where many urban and industrial hubs are located and are frequently encountered in civil engineering projects
In order to obtain the water absorption percentage according to ASTMD 4609-00, after curing the samples, their weights were recorded and they were kept in water for two days
The most significant influence on the coefficient of softening happened to be from a 28 day test specimen corresponding to the addition of 5% Hydrated Lime (HL), 0% sewage sludge ash (SSA) and 5% HL, 10% SSA
Summary
Soft clay soil is one of the problematic soils covering considerable parts of the earth including many low-land and coastal regions where many urban and industrial hubs are located and are frequently encountered in civil engineering projects. Some of the major behavioral and strength problems associated with these types of soils are low strength, excessive settlements, expansive, collapsible, liquefiable, soluble, dispersive, silty fine sands, highly organic weak soils, high plasticity, swelling, dispersivity, erodibility, high compressibility and sensitivity to environmental conditions Problematic soils such as soft clay soils were improved in order to improve their behavioral and strength properties [1, 2]. One of the major techniques used to overcome the problems created by soft soils is the mixing with a cementitious binder These binders are cement and/or lime, which ‘glue’ the soil particles together mainly through chemical and not physical reactions.
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