eprintid: 14616
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/01/46/16
datestamp: 2023-11-10 03:29:12
lastmod: 2023-11-10 03:29:12
status_changed: 2023-11-10 01:57:22
type: article
metadata_visibility: show
creators_name: Haruna, S.
creators_name: Mohammed, B.S.
creators_name: Wahab, M.M.A.
creators_name: Kankia, M.U.
creators_name: Amran, M.
creators_name: Gora, A.M.
title: Long-term strength development of fly ash-based one-part alkali-activated binders
ispublished: pub
keywords: Binders; Compressive strength; Curing; Drying; Fly ash; Hardening; Pore size; Scanning electron microscopy; Sodium compounds; Surface chemistry, Alkali-activated binder; Ambient conditions; Field emission scanning electron microscopes; Long-term properties; Long-term strength; Microstructural analysis; Sodium metasilicate; Strength property, Water absorption
note: cited By 37
abstract: This research aims to study the effect of the dosage of anhydrous sodium metasilicate activator on the long-term properties of fly ash-based one-part alkali-activated binders (OPAAB) cured at ambient conditions. Powdered sodium metasilicate activator was utilized in the range of 8�16 by weight of the fly ash in producing the OPAAB. The properties examined are hardened density, compressive strength, flexural strength, water absorption, efflorescence formation, and microstructural analysis. The experimental result revealed that the binders exhibited excellent longterm strength properties. The compressive strength of the OPAAP is well correlated with its hardened density. The pastes were found to exhibit good soundness characteristics over the long-term. The absorption of water decreases with an increase in the activator dosage from 8�12, and beyond that, the water absorption relatively remains the same. Field emission scanning electron microscope (FESEM) micrograph revealed uniformly formed solid matrices with the micro-crack present were observed in the samples. The larger pore size promotes the crystallization of the resulting hydrate substances (N, C)-A-S-H gel. The initial dissolution of the OPAAP occurred within the first 30 min. At longer age of curing, mixtures with a higher dosage of powdered activator tend to absorb less water. Strength properties beyond 28 days are considered as the long-term strength. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
date: 2021
publisher: MDPI AG
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85111752494&doi=10.3390%2fma14154160&partnerID=40&md5=c4caf68a0828566ed8096b92b8ded360
id_number: 10.3390/ma14154160
full_text_status: none
publication: Materials
volume: 14
number: 15
refereed: TRUE
issn: 19961944
citation:   Haruna, S. and Mohammed, B.S. and Wahab, M.M.A. and Kankia, M.U. and Amran, M. and Gora, A.M.  (2021) Long-term strength development of fly ash-based one-part alkali-activated binders.  Materials, 14 (15).   ISSN 19961944