Is electrodeless resistivity method suitable for monitoring the early-age reaction of Na2SiO3-activated slag? Mechanism and application
| Autor: | Bao Liu, Le Shuai, Kunde Zhuang, Wu-Jian Long, Guo Ying, Feng Xing, Yuan Fang, Biqin Dong |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
0211 other engineering and technologies 020101 civil engineering 02 engineering and technology Building and Construction 0201 civil engineering law.invention Portland cement Compressive strength law Electrical resistivity and conductivity 021105 building & construction Setting time Hardening (metallurgy) General Materials Science Turning point Product formation Composite material Curing (chemistry) Civil and Structural Engineering |
| Zdroj: | Construction and Building Materials. 272:121719 |
| ISSN: | 0950-0618 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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