期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 147, 期 -, 页码 101-116出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2017.04.171
关键词
Red mud; Ca(OH)(2)-Na2CO3-activated; Fly ash; Recycling; Cementless binder
资金
- Commercializations Promotion Agency for R&D Outcomes (COMPA) - Ministry of Science, ICT and Future Planning (MISP) [2016K000146]
- International Collaborative R&D Program - Ministry of Trade, Industry, and Energy (MOTIE), Republic of Korea [1415144246, N0000936]
- Korea Evaluation Institute of Industrial Technology (KEIT) [N0000936] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This paper explored the effectiveness of red mud and a mixture powder of Ca(OH)(2) (=C), Na2CO3 (=N), and fly ash (=F) (denoted CNF powder) as precursor materials to produce an environment-friendly high strength brick product. Overall, despite the inclusion of up to similar to 81% of red mud and fly ash, 7-day strengths were developed similar to 17-34 MPa; this was high enough to be used as a structural binder for brick production. In particular, the use of NaOH was very effective in increasing flowability, and, more importantly, early strength in the red mud-CNF blended system, despite the red mud inclusion, because NaOH greatly improved the degree of reaction of the system, resulting in more calcium silicate hydrates (C-S-H) formation as well as significant pore size refinement at early days of curing. Trial bricks were also prepared to examine possible toxicity due to the inclusion of red mud and fly ash using the toxicity characteristic leaching procedure (TCLP) test and the TCLP concentrations were very low. (C) 2017 Elsevier Ltd. All rights reserved.
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