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- W4300687785 endingPage "129230" @default.
- W4300687785 startingPage "129230" @default.
- W4300687785 abstract "The use of recycled construction demolition (C&D) waste in geo-environmental infrastructure as a carbon neutralization strategy has gained traction recently. This review aims to provide a state-of-the-art on the unsaturated hydro-mechanical properties of C&D waste and its unexplored application in possible geo-environmental infrastructures. More than 100 studies comprising theoretical and numerical modelling, laboratory investigation, and field tests on the use of C&D waste have been discussed in this review systematically. The effects of particle size distribution, water absorption capacity, abrasion index, flakiness index, pH, reactivity index and microstructural cracks of C&D waste on its unsaturated hydro-mechanical properties were evaluated. Due to its porous nature and the presence of adhesive ettringite and needle-like minerals on the C&D waste’s surface, its water absorption capacity is usually 2.3–4.6 times higher than natural aggregates. The applications of soil-recycled aggregates composite in geo-environmental infrastructures, such as slopes, landfill cover system, subgrade in pavements, geosynthetic reinforced backfill soil, green roof, are discussed in the context of unsaturated soil behaviour. From this review, the effects of freeze-thaw cycling, high precipitation events, and extreme desiccation on the performance of C&D waste based geo-environmental infrastructure were seen to be lacking in literature. Even though the C&D waste is deemed to be a suitable adsorbent due to its chemical composition, very few studies have explored C&D waste as a filter material for heavy metal retention in geo-environmental infrastructure. The thermodynamic properties of C&D waste as an adsorbent indicated that the sorption process is exothermic, and the entropy and Gibbs free energy being positive and negative, respectively. The review identifies new research themes for developing C&D waste as an adsorbent by optimizing the C&D waste particle size, adsorbent concentration, imparting surface functionality, contact time and making C&D waste compatible with other geo-materials. The feasibility of C&D waste for geo-polymerisation and application in slope stability measures is discussed by highlighting its recent progress in concrete industry application. The potential of bio-mediated techniques such as microbial and enzyme induced calcite precipitation to amend C&D waste based geo-environmental infrastructure has been put forward." @default.
- W4300687785 created "2022-10-04" @default.
- W4300687785 creator A5036279220 @default.
- W4300687785 creator A5071715952 @default.
- W4300687785 creator A5077026765 @default.
- W4300687785 date "2022-11-01" @default.
- W4300687785 modified "2023-10-14" @default.
- W4300687785 title "Feasibility of construction demolition waste for unexplored geotechnical and geo-environmental applications- a review" @default.
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