Effect of metakaolin and lime addition on geopolymerization of construction and demolition waste.

Autor: Pathak A; Department of Chemistry, Tri-Chandra Multiple Campus, Tribhuvan University, Ghantaghar, Kathmandu, Nepal., Kumar S; CSIR-National Metallurgical Laboratory, Jamshedpur, India., Jha VK; Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu, Nepal. vinayj2@yahoo.com.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2024 Oct 08. Date of Electronic Publication: 2024 Oct 08.
DOI: 10.1007/s11356-024-35234-1
Abstrakt: Construction and demolition waste generates the largest amount of waste by volume, which threatens sustainable development and adversely affects the environment. These wastes contain a significant amount of aluminosilicates that have the potential to be used as building materials for value-added applications applicable to alternative construction materials. This study aims to synthesize geopolymers from brick powder using metakaolin/lime as additives and compare their physico-mechanical properties. The compressive strengths of the geopolymer products GP-1, GP-2, and GP-3 developed at 28 days from brick powder and metakaolin/lime with the activator solution were found to be 8.35, 21.30, and 25.0 MPa respectively, 2.55 and 2.99 times higher when metakaolin and lime were added. FTIR spectra and SEM-EDX micrographs of the reaction products showed structural changes and formation of aluminosilicate hydrate and calcium silicate hydrate gel with Al 2 O 3 /Na 2 O ratios of 0.75, 1.67, and 1.98 respectively. The reaction products containing SiO 2 /(SiO 2  + Al 2 O 3  + Fe 2 O 3 ) ratios of 0.70 and 0.76 were found to be desirable. The geopolymer product GP-3 was found to have a higher bulk density and mechanical strength than those of GP-1 and GP-2. These products are found to be very hard, with potential applications in construction industries to conserve the environment.
(© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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