TY - JOUR
T1 - Influence of seawater concentration on alkali-silica reaction of seawater sea-sand concrete
T2 - Mimicking through NaCl solution and recycled glass aggregate
AU - Zhang, Yangyang
AU - Zhang, Qunli
AU - Xue, Caihong
AU - Wu, Kai
AU - Chang, Jun
AU - Lu, Jianxin
AU - Shen, Peiliang
AU - Zhao, Qingxin
AU - Poon, Chi Sun
N1 - Funding Information:
We wish to thank the financial supports of National Natural Science Foundation of China (52108252), the Theme-Based Research Scheme of the Research Grants Council of the Hong Kong SAR Government (T22-502/18-R), Science and Technology Project of Hebei Education Department (BJK2023023), Natural Science Foundation of Hebei Province (E2021203147). The project is also supported by Key Laboratory of Advanced Civil Engineering Materials (Tongji University), Ministry of Education (No. 202305).
Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/8/29
Y1 - 2023/8/29
N2 - Seawater sea-sand concrete (SSC) is one environment-friendly and promising construction material. Nevertheless, limited research shed favorable light on alkali-silica reaction (ASR) of SSC. This work provided a novel insight regarding the fast test method that (i) the recycled glass aggregate (RGA) was used for fast assessing the effect of seawater concentration on ASR, reusing its characteristic resource; (ii) the NaCl solutions with different concentrations were used to mimic different salinities of sea waters; and (iii) a modified curing method was adopted. The results showed that the NaCl solution could be used for assessing ASR risk of SSC instead of seawater. The specimens mixed with twice and above the sodium concentration of seawater would exhibit ASR expansion, strength reduction, coarsening of nanopore distribution, and the cracks on the macro and micro levels. However, the change of NaCl concentration scarcely affected the composition and content of hydration products. Additionally, with increasing the mixing Na+ concentration, the ASR crack would firstly appear in the interface between the cement paste layer and the glass layer, and then developed in the internal zone of RGA matrix with different hardness, elastic modulus, and Si contents based on the destroyed degree.
AB - Seawater sea-sand concrete (SSC) is one environment-friendly and promising construction material. Nevertheless, limited research shed favorable light on alkali-silica reaction (ASR) of SSC. This work provided a novel insight regarding the fast test method that (i) the recycled glass aggregate (RGA) was used for fast assessing the effect of seawater concentration on ASR, reusing its characteristic resource; (ii) the NaCl solutions with different concentrations were used to mimic different salinities of sea waters; and (iii) a modified curing method was adopted. The results showed that the NaCl solution could be used for assessing ASR risk of SSC instead of seawater. The specimens mixed with twice and above the sodium concentration of seawater would exhibit ASR expansion, strength reduction, coarsening of nanopore distribution, and the cracks on the macro and micro levels. However, the change of NaCl concentration scarcely affected the composition and content of hydration products. Additionally, with increasing the mixing Na+ concentration, the ASR crack would firstly appear in the interface between the cement paste layer and the glass layer, and then developed in the internal zone of RGA matrix with different hardness, elastic modulus, and Si contents based on the destroyed degree.
KW - Alkali-silica reaction
KW - Microstructure
KW - Nanoindentation
KW - Recycled glass aggregate
KW - Seawater sea-sand concrete
UR - http://www.scopus.com/inward/record.url?scp=85162130393&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2023.132110
DO - 10.1016/j.conbuildmat.2023.132110
M3 - Journal article
AN - SCOPUS:85162130393
SN - 0950-0618
VL - 394
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 132110
ER -