Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 272, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2020.121719
Keywords
Alkali-activated materials; Early-age reaction stages; Structural development; Electrical resistivity; Nondestructive testing
Categories
Funding
- Chinese National Natural Science Foundation [52078300, 51508337, 51538007]
- Natural Science Foundation of Guangdong Province [2019A1515012014]
- Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering (SZU) [2020131212060074]
- Natural Science Foundation of SZU [827000091]
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The electrodeless resistivity method was newly applied to investigate the early-age reaction of Na2SiO3 activated slag, showing that resistivity curves can be used as an indirect index for monitoring the early-age reaction, setting, and hardening behavior of AAMs, providing fresh perspectives for understanding mechanisms and engineering applications.
Electrodeless resistivity method was newly applied to investigate the early-age reaction of Na2SiO3 activated slag, one branch of eco-friendly alkali-activated materials (AAMs). Under the proposed model, physical meanings at different stages of 0-24 h resistivity curves of pastes with water-solids ratios ranging from 0.35 to 0.5 were explained, in which reaction heat, TEM, MIP, pH value, compressive strength providing comparative analyses from three aspects: rate of product formation, structural development and pore solution. Besides, initial/final setting time were linearly correlated with the turning points on resistivity curve respectively and, unlike the case of ordinary Portland cement (OPC), the initial setting time was not coincided with turning point on resistivity, probably due to the quick formation of initial gel on the slag particles. For a given water-solids ratio or curing age within 24 h, compressive strength and resistivity were actually inverses of one another, but the relationship seemed to be blurred by other factors beyond 24 h. This study shows that resistivity could be used as indirect index for monitoring the early-age reaction of AAMs and subsequent setting and hardening behavior, by which fresh vistas may be opened up for mechanisms understanding and engineering applications. (C) 2020 Elsevier Ltd. All rights reserved.
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