Synergistic chemical and microbial cementation for stabilization of aggregates
MetadataShow full item record
© 2017 The use of Portland cement as a stabilizer of granular materials such as sand, is comparable to that in concrete. Although a relatively small percentage of cement is used for a stabilized soil system, the consumption of cement in Australian road bases and mining backfills is only second to the concrete industry. Conventionally, Portland cement is used as a binder for these applications. This paper explores low embodied energy alternative binders such as geopolymers and microbial cementation. A combination of the chemical and microbial binders has been attempted. The performance of the stabilized systems in terms of compressive strength, elastic modulus and water absorption was determined. It is noted that the chemical and the microbial cementation work synergistically. A microstructural investigation has been performed to reveal the synergistic nature of the two binding systems. The new technology is able to significantly reduce the embodied energy and emission of stabilized granular materials.
Showing items related by title, author, creator and subject.
Upscaling Effects of Soil Improvement by Microbially Induced Calcite Precipitation by Surface PercolationCheng, Liang; Cord-Ruwisch, R. (2014)This study has contributed to the technology of soil stabilization via biocementation based on microbially induced calcite precipitation. The newly described method of in situ soil stabilization by surface percolation to ...
Dekuyer, A.; Cheng, L.; Shahin, Mohamed; Cord-Ruwisch, R. (2012)Existing methods for improving the engineering properties of soils are diverse with respect to their final outcome. Grouting by chemical additives is currently one of the most commonly used soil stabilization techniques; ...
Nusit, K.; Jitsangiam, Peerapong; Kodikara, J.; Bui, H.; Leung, G.L.M. (2015)One of the most common methods used in road-pavement construction is the stabilizing of the conventional pavement base course layer. This is achieved by adding cement or lime to gain better material performance. However, ...