Influence of the initial moist curing time on the sulfate attack resistance of concretes with different binders
Influence of the initial moist curing time on the sulfate attack resistance of concretes with different binders
复制标题
初始湿养护时间对不同粘结剂混凝土抗硫酸盐侵蚀性能的影响
DOI：
10.1016/j.conbuildmat.2017.03.235
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发表时间：
2017-07
影响因子：
7.4
通讯作者：
Zhou Yuqi
中科院分区：
文献类型：
--
作者：
Zhang Zengqi;Wang Qiang;Chen Honghui;Zhou Yuqi
通过测定硫酸盐侵蚀前混凝土的抗压强度和氯离子渗透性、硫酸盐侵蚀后混凝土的抗压强度以及腐蚀后混凝土基体的微观结构，研究了初始湿养护时间对不同粘结剂和不同水胶比混凝土抗硫酸盐侵蚀性能的影响。结果表明，硫酸钠结晶和硫酸盐侵入形成的钙矾石是硫酸盐侵蚀环境下混凝土的主要膨胀源。掺加粉煤灰和矿渣粉在充分湿养护的前提下，均有显著降低混凝土透气性和增强混凝土抗硫酸盐侵蚀性能的趋势。在各湿养护初始状态下，GGBS对混凝土抗硫酸盐侵蚀性能的增强作用均大于粉煤灰。在湿养护不足3天或7天的情况下，掺粉煤灰混凝土的抗压强度损失率与素水泥混凝土的抗压强度损失率接近，说明掺粉煤灰对混凝土抗硫酸盐侵蚀性能的增强贡献不大。虽然GGBS对混凝土抗硫酸盐侵蚀的增强作用随着湿养护时间的减少而减弱，但含GGBS混凝土的抗压强度损失率约为普通水泥混凝土的一半。水胶比较低时，混凝土抗硫酸盐侵蚀性能对湿养护时间的敏感性较低。
The influence of the initial moist curing time on the resistance to the sulfate attack of concretes with different binders and at different water/binder ratios was studied by determining the compressive strength and the chloride ion permeability of the concrete before sulfate attack, the compressive strength after sulfate attack, and the microstructure of the corroded concrete matrix. The results illustrate that both the crystallized sodium sulfate and ettringite formed due to invaded sulfate are the principal expansion sources of the concrete subjected to the sulfate attack environment. Both the additions of fly ash and ground granulated blast furnace slag (GGBS) tend to significantly reduce the permeability and enhance the sulfate attack resistance of concrete on the premise of sufficient moist curing. The enhancing effect of GGBS is greater than that of fly ash on the sulfate attack resistance of concrete with each initial moist curing regime. In the case of insufficient moist curing for 3 or 7 days, the compressive strength loss rate of concrete containing fly ash is close to that of the plain cement concrete, indicating that the addition of fly ash makes little contribution to the enhancement of the sulfate attack resistance of concrete. Though the enhancing effect of GGBS on the sulfate attack resistance of concrete decreases with the decrease of moist curing time, the compressive strength loss rate of the concrete containing GGBS is about half of that of the plain cement concrete. The sulfate attack resistance of concrete is less sensitive to the moist curing time at lower water/binder ratio.
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