Study on a high strength ternary binder cured under different conditions
Study on a high strength ternary binder cured under different conditions
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DOI：
10.1016/j.conbuildmat.2016.01.022
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发表时间：
2016-03
影响因子：
7.4
通讯作者：
Guoxin Li;A. Zhang;Ge Zhang;Ting Tian
中科院分区：
文献类型：
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作者：
Guoxin Li;A. Zhang;Ge Zhang;Ting Tian
采用以普通硅酸盐水泥（OPC）、铝酸钙水泥（CAC）、硫酸钙（CS）为主的高强三元粘结剂作为修补材料。然而，温度和湿度决定了这种粘合剂的强度。此外，OPC-CAC-CS的比例对体系的流动性、凝结时间和机械性能有很大影响。本研究中使用三元粘结剂的砂浆在不同条件下固化。然后评价不同龄期的抗压强度和抑制膨胀率。结果表明，采用82%~10%~8%比例的OPC-CAC-CS体系可得到高强度粘结剂。蒸汽养护的早期抗压强度高于标准养护，但28天时出现相反的结果，并且干养护的强度没有下降。在标准养护和蒸汽养护下，砂浆的膨胀率都随着时间的增加而增加，但在干燥箱中则降低。 XRD、TG和SEM表明，当样品在不同温度和湿度下固化时，钙矾石和氢氧化钙的含量与微观结构之间存在关系。
High strength ternary binder based on ordinary Portland cement (OPC), calcium aluminate cement (CAC) and calcium sulfate (CS) is used as repair materials. However, temperature and humidity govern the strength of this binder. In addition, the proportions of OPC–CAC–CS have strong influence on the fluidity, setting time and mechanical properties of the system. The mortars with the ternary binder were cured under different conditions in this study. Then the compressive strength and the restrained expansion rate at different ages were evaluated. The results show that high strength binder was obtained using the proportion of 82%–10%–8% of the OPC–CAC–CS system. The early compressive strength under steam curing was higher than that of under standard curing, but a contrary result was occurred at 28 days and the strength did not decrease under dry curing. The expansion rates of the mortars increased with the increase of time under both the standard and the steam curing, but decreased in the dry oven. XRD, TG and SEM show that a relationship between the content and microstructure of ettringite and calcium hydroxide was found when the samples were cured under different temperatures and humidity.