eprintid: 11098
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/01/10/98
datestamp: 2023-11-10 03:25:39
lastmod: 2023-11-10 03:25:39
status_changed: 2023-11-10 01:14:29
type: article
metadata_visibility: show
creators_name: Mohammed, B.S.
creators_name: Haruna, S.
creators_name: Mubarak bn Abdul Wahab, M.
creators_name: Liew, M.S.
title: Optimization and characterization of cast in-situ alkali-activated pastes by response surface methodology
ispublished: pub
keywords: Alumina; Aluminum oxide; Binders; Blast furnaces; Carbon footprint; Concrete products; Fly ash; Geopolymers; Inorganic polymers; Manufacture; Portland cement; Silica; Silicates; Slags; Surface properties; Water absorption, Alkali activated; Alkali-activated binder; Ground granulated blast furnace slag; Microstructural assessments; Response surface; Response surface methodology; Sodium silicate; Strengths, Sodium compounds
note: cited By 53
abstract: Due to its low carbon footprint and the capacity to be used for in situ applications, cast in-situ geopolymers are recognized as a feasible substitute of Portland cement. One of the limiting factors of using geopolymer in concrete sectors is dealing with viscous and dangerous alkaline alternatives, making it hard to adopt for mass concrete manufacturing. The advanced binder comprises of aluminosilicate components and granular sodium metasilicate to which water has been added like OPC. This document reports on the novel experimental method of producing cast in-situ alkali-activated binders using fly ash, ground granulated blast furnace slag (GGBS) and anhydrous sodium metasilicate. The defined method is described with a logical experimental study conducted to examine a feasible manufacturing method for casting in-situ geopolymer production. Replacement concentrations for slag were 0�100 percent by fly ash weight, while activator is used at 8�16 of the complete binder content. The strengths, absorption rate and microstructural behaviour of cast in-situ alkali-activated pastes were regarded for up to 28 days. The resistance development of one-part/cast in-situ alkali-activated binders was discovered to be comparable to that of OPC. Microstructural assessment disclosed that the incorporation of GGBS in the paste resulted in structural changes of the in-situ geopolymer paste that could be attributed to the creation of C-A-S-H gel owing to the existence of extremely reactive alumina and silica in the source materials. Using the variance analysis, the impact of slag and sodium metasilicate activator on the behaviour of cast in-situ geopolymer pastes was acquired. The defined models were discovered to be important for all P-value reactions of <5. Results of numerical optimizations showed that the best mixture can be obtained by replacing 100 percent fly ash with slag and 11.19 percent sodium metasilicate with total binders weight. © 2019 Elsevier Ltd
date: 2019
publisher: Elsevier Ltd
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85073156064&doi=10.1016%2fj.conbuildmat.2019.07.267&partnerID=40&md5=3785199ce0a6a5b28a04b65941ac7aec
id_number: 10.1016/j.conbuildmat.2019.07.267
full_text_status: none
publication: Construction and Building Materials
volume: 225
pagerange: 776-787
refereed: TRUE
issn: 09500618
citation:   Mohammed, B.S. and Haruna, S. and Mubarak bn Abdul Wahab, M. and Liew, M.S.  (2019) Optimization and characterization of cast in-situ alkali-activated pastes by response surface methodology.  Construction and Building Materials, 225.  pp. 776-787.  ISSN 09500618