Characteristics of the alkali-silica reaction in seawater and sea sand concrete with different water-cement ratios

被引：11
作者：
Wu, Wenda [1 ]
Wang, Tao [1 ]
Gong, Qingnan [1 ]
Zhang, Kaijian [1 ]
An, Xiaopeng [2 ]
Wang, Dehui [1 ]
机构：
[1] Fuzhou Univ, Coll Civil Engn, Fuzhou 350116, Peoples R China
[2] China Bldg Mat Acad, State Key Lab Green Bldg Mat, Beijing 100024, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2023年 / 400卷
基金：
中国国家自然科学基金;
关键词：
Seawater and sea sand concrete; Alkali-silica reaction; Expansion rate; Na-shlykovite; ASR-P1; MECHANICAL-PROPERTIES; AGGREGATE; PERFORMANCE; MODEL; SIZE;
D O I：
10.1016/j.conbuildmat.2023.132822
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Research of seawater and sea sand concrete (SWSSC) is the current hot topic, but effects of water-cement ratios (W/C) on alkali-silica reaction (ASR) of SWSSC haven't been investigated. To solve this issue, the ASR products, pore structure and expansion rate of specimens with different W/C (0.35 similar to 0.55) were measured. The study shows that pore structure and Na+ consumption are two key factors influencing ASR of SWSSC. When the W/C increases from 0.45 to 0.55, Na+ in specimen replaces K+ in ASR-P1(K0.52Ca1.16Si4O8(OH)(2.84)center dot 1.5H(2)O), and ASR-P1 is converted into Na-shlykovite(NaCaSi4O8(OH)(3)center dot 2.3H(2)O); the porosity is the dominant factor for the expansion rate of SWSSC. When the W/C increases from 0.35 to 0.45, the Na+ consumption is the dominant factor for the expansion rate of SWSSC. Magnesium element mainly coexists in Na-shlykovite and transition zone in SWSSC with W/C = 0.55. The research results are beneficial to inhibit ASR of SWSSC with different W/C and improve their durability.
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页数：11
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