1. Stabilisation of soft soil with recycled plaster admixtures.
- Author
-
Ahmed, Aly, Nagy, Nabil M., El Naggar, Mohamed Hesham, and Kamei, Takeshi
- Subjects
- *
SOIL stabilization , *PLASTER , *SOLID waste management , *CLAY soils , *SCANNING electron microscopy - Abstract
Solid waste management is a serious problem worldwide as the amounts of produced wastes are increasing annually. For example, the disposal of waste gypsum plasterboard, used as dry walling across the world, represents a serious environmental issue. Therefore, this study examines the potential for reusing plasterboard wastes as a stabiliser material for earthwork projects, especially for organic soft clay soil. Recycled plaster, mixed with cement or lime at different ratios was used as a stabiliser for tested soil. Atterberg limits, scanning electron microscopy, x-ray diffraction, compressive strength, and secant moduli tests were conducted to evaluate the improvement in stabilised soil properties. The results indicate that the inclusion of plaster-cement (B-C) or plaster-lime (B-L) admixtures improved the geomechanical properties of the stabilised soil, with higher admixture concentrations leading to greater improvement. Moreover, the soil specimens stabilised using the B-L admixture exhibited a higher strength gain rate and reduction in plasticity index and water content than those stabilised by the B-C admixture. The development of cementation compounds in a stabilised soil matrix has a considerable effect on permanent strength enhancement. It is concluded that the proposed stabilising technique can be valuable for both waste management and construction industries. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF