eprintid: 10108122
rev_number: 21
eprint_status: archive
userid: 608
dir: disk0/10/10/81/22
datestamp: 2020-08-24 15:07:35
lastmod: 2021-10-12 21:56:03
status_changed: 2021-01-21 19:37:47
type: article
metadata_visibility: show
creators_name: Wang, Y
creators_name: Chan, CL
creators_name: Leong, SH
creators_name: Zhang, M
title: Engineering properties of strain hardening geopolymer composites with hybrid polyvinyl alcohol and recycled steel fibres
ispublished: pub
divisions: UCL
divisions: B04
divisions: C05
divisions: F44
keywords: Fibre reinforced concrete, Alkali-activated materials, Bendable concrete, Engineered geopolymer composites, Recycled fibre, Toughening mechanism
note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.
abstract: Strain hardening geopolymer composite (SHGC) is an alkali-activated material reinforced with randomly dispersed short fibres, which exhibits high ductility and strain hardening and multiple cracking behaviour. This paper presents an experimental study on the effect of hybrid polyvinyl alcohol (PVA) and recycled tyre steel (RTS) fibres on engineering properties of fly ash-slag based SHGC cured at ambient temperature, including flowability, setting time, drying shrinkage, compressive strength and flexural behaviour in terms of stress–deflection response, first-crack strength and flexural strength, flexural toughness and toughening mechanisms. Four mix proportions of specimens with various volume fractions of hybrid PVA and RTS fibres including 1.5% PVA, 2% PVA, 1.75% PVA + 0.25% RTS and 1.5% PVA + 0.5% RTS were considered. The results indicated that the hybridisation of PVA fibre with RTS fibre led to a significant reduction in flowability, setting time and flexural strength of SHGC. However, the resistance to drying shrinkage and compressive strength of SHGC were greatly improved. Moreover, all specimens exhibited the expected deflection hardening behaviour with multiple stable microcracks formed over the tensile face of specimens under four-point bending. The addition of RTS fibre resulted in reduced crack widths in specimens where over 90% of cracks had a width of smaller than 60 μm. The mixture containing 2.0 vol% PVA fibre can be regarded as the optimal mixture for SHGC considering the strengths and deflection (or strain) hardening behaviour.
date: 2020-11-20
date_type: published
publisher: Elsevier
official_url: https://doi.org/10.1016/j.conbuildmat.2020.120585
oa_status: green
full_text_type: other
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 1808657
doi: 10.1016/j.conbuildmat.2020.120585
lyricists_name: Zhang, Mingzhong
lyricists_id: MZHAA72
actors_name: Zhang, Mingzhong
actors_id: MZHAA72
actors_role: owner
full_text_status: public
publication: Construction and Building Materials
volume: 261
article_number: 120585
issn: 0950-0618
citation:        Wang, Y;    Chan, CL;    Leong, SH;    Zhang, M;      (2020)    Engineering properties of strain hardening geopolymer composites with hybrid polyvinyl alcohol and recycled steel fibres.                   Construction and Building Materials , 261     , Article 120585.  10.1016/j.conbuildmat.2020.120585 <https://doi.org/10.1016/j.conbuildmat.2020.120585>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10108122/1/Full_Manuscript.pdf