期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 146, 期 -, 页码 312-320出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2017.04.103
关键词
Strength; Microstructure; Coffee grounds; Rice husk ash; Slag; Geopolymer
资金
- Rajamangala University of Technology Isan
- Thailand Research Fund under the TRF Senior Research Scholar program [RTA5980005]
This paper investigates the strength and microstructure properties of spent coffee grounds stabilized with rice husk ash and slag geopolymers to produce a green construction subgrade material. Spent coffee grounds (CG) and rice husk ash (RHA) are organic wastes derived from agricultural products. CG is the residue from ground coffee beans. RHA is a by-product from the burning rice husk used to generate electricity. Ground granulated blast furnace slag (S) is a waste by-product derived from steel production. RHA and S were used as geopolymeric precursors (P). This study provides an insight on the long-term strength performance and microstructural formation of geopolymers synthesized from agricultural waste products. The influence factors studied were liquid alkaline activator content (L), RHA content, S content, temperature and curing time. By observing the strength development of CG-RHA geopolymers for up to 90 days, it was found that elevated temperature curing was needed for these CG:RHA geopolymers to develop long-term strengths. Test results show that an optimum mix of CG:RHA:S 70:20:10 cured at 50 degrees C can achieve an Unconfined Compressive Strength (UCS) of 2 MPa after 90 days of curing. The outcome of this research will enable CG, S and RHA waste products to be used as sustainable materials in pavement applications. (C) 2017 Elsevier Ltd. All rights reserved.
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