Skip to main content

Research Repository

Advanced Search

Effect of curing conditions on the pore solution and carbonation resistance of alkali-activated fly ash and slag pastes

Nedeljkovi?, Marija; Ghiassi, Bahman; van der Laan, Sieger; Li, Zhenming; Ye, Guang

Effect of curing conditions on the pore solution and carbonation resistance of alkali-activated fly ash and slag pastes Thumbnail


Authors

Marija Nedeljkovi?

Bahman Ghiassi

Sieger van der Laan

Zhenming Li

Guang Ye



Abstract

The effect of curing conditions (sealed and unsealed) on the pore solution composition and carbonation resistance of different binary alkali-activated fly ash (FA) and ground granulated blast furnace slag (GBFS) pastes is investigated in this study. The studied mixtures were with FA/GBFS ratios of 100:0, 70:30; 50:50, 30:70, 0:100. Ordinary Portland cement (OPC) and Cement III/B (70?wt% of GBFS and 30?wt% OPC) pastes with the same precursor content were also studied to provide a baseline for comparison. Accelerated carbonation conditions (1% (v/v) CO2, 60% RH for 500?days) were considered for evaluating the carbonation resistance of the pastes.

The results show a substantial lower [Na+] in the pore solution of the unsealed cured samples compared to the sealed cured samples. It is also found that unsealed curing of the samples leads to a faster carbonation rate. Additionally, it is observed that the carbonation rate decreases with increasing GBFS content independent of the curing conditions. The potential risks with respect to carbonation of the pore solution are also identified and discussed.

Journal Article Type Article
Acceptance Date Nov 14, 2018
Online Publication Date Nov 27, 2018
Publication Date 2019-02
Deposit Date Nov 29, 2018
Publicly Available Date Nov 28, 2019
Journal Cement and Concrete Research
Print ISSN 0008-8846
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 116
Pages 146-158
DOI https://doi.org/10.1016/j.cemconres.2018.11.011
Keywords Alkali-activated fly ash/slag; Curing condition; Pore solution; Carbonation
Public URL https://nottingham-repository.worktribe.com/output/1338136
Publisher URL https://www.sciencedirect.com/science/article/pii/S0008884618303272?via%3Dihub

Files





Downloadable Citations