The use of industrial by-products in the stabilisation of problematic soils presents economic, environmental and social benefits. The geotechnical and physico-chemical behaviour of some Australian clayey soils of contrasting mineralogy stabilised with commonly employed industrial by-products has been investigated in the laboratory for developments in pH, plasticity, and undrained shear strength at curing periods of up to 1 year. Stabilising agents including hydrated lime, fly ash and ground granulated blastfurnace slag (‘slag') were utilised. The results of this study showed that soils mixed to moisture contents well above their respective liquid limits developed substantial undrained shear strength directly upon exposure to cementitious stabilisers and continued to gain significant strength thereafter. It is noteworthy that samples treated with slag activated with hydrated lime gained more strength at shorter periods of curing than comparable samples of activated fly ash and samples simply treated with e...

Factors Affecting Cementitious Stabilization in a Range of Geo-Environments

Stabilisation of clayey soils with industrial by-products: part A

This paper compares experimental results on the stabilization of clayey dredged material (DM) using quicklime (QL), hydrated lime (HL), portland cement (PC), and Class F fly ash (FA). The D...

Stabilization of Silty Clayey Dredged Material

When an unsuitable soil is come across in areas with limited resources, engineers must add transportation cost to the overall cost if a suitable soil has to be hauled from a long distance. In such instances, improvement of the existing soils with locally available materials would be the most beneficial solution. Most of the rural roads in Sri Lanka are now under a phase lift although with lot of constraints. Road Development Authority is practicing a guideline developed consisting of the grading of soil, Atterberg limits, Proctor density and California Bearing Ratio (CBR) to select a suitable subgrade material. However, in most of the cases, soils are rejected due to low CBR, although the other conditions are satisfactory. This study discusses the improvements of such rejected soils from distinct places of Sri Lanka with quarry dust, lime stone dust, paddy husk ash, fly ash and copper slag. Basic soil tests such as particle size analysis, Atterberg limits, Proctor compaction and CBR tests were conducted on unimproved and improved soils. A considerable increase in the CBR (in the range of 10–20 times) was observed with the addition of industrial byproducts to improve rejected soils. Mixing is proposed with a traditional conveyor belt mechanism. Use of industrial byproducts in the infrastructure development is to be encouraged with the objective in preserving environment by reducing utilization of new resources and excessive dumping of by products to the environment.

Factors Affecting Cementitious Stabilization in a Range of Geo-Environments

Citations

Stabilisation of clayey soils with industrial by-products: part A

Stabilization of Silty Clayey Dredged Material

Use of Industrial Byproducts to Improve Unsuitable Soils for Road Construction in Sri Lanka