Modification on the chloride binding capacity of cementitious materials by aluminum compound addition

Modification on the chloride binding capacity of cementitious materials by aluminum compound addition
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添加铝化合物对胶凝材料氯离子结合能力的改性

DOI:
10.1016/j.conbuildmat.2019.06.137
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发表时间:
2019-10
影响因子:
7.4
通讯作者:
Xiao Xunguang
Xiao Xunguang
中科院分区:
工程技术1区
文献类型:
--
作者:
Wang Yunyao;Shui Zhonghe;Gao Xu;Huang Yun;Yu Rui;Xiao Xunguang

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研究了铝化合物对混合氯化物在胶凝材料中结合性能的影响。应用了三种常用的铝化合物,氧化铝、氢氧化铝和胶体纳米氧化铝。对结合氯化物含量、水化产物和氢氧化钙含量进行了分析。结果表明,在无有效氯化物存在的情况下,铝化合物转变为碳铝酸盐、单硫铝酸盐等AFM相。当混合水中含有氯化物时,根据氯化钠和铝化合物的含量,上述AFMS转变为氯铝酸盐,例如库泽尔盐或弗里德尔盐。在整个养护龄期内,铝化合物的加入显著提高了结合氯含量,即使在早期养护3 d时也是如此。由于铝化合物的反应速度慢于氧化铝熟料,7 天后,铝化合物混合浆的结合氯含量显著增加,而普通浆体的结合氯含量很小。通常情况下,氯化物的掺入促进了延迟钙矾石的形成,而铝化合物的加入可以抑制这种作用,因为形成的原子力显微镜数量较多。混合氯化物用量越大,体系中结合氯含量越高,氢氧化钙含量越低,自由水含量越低。
This study investigates the effects of aluminum compound on the binding of admixed chloride in cementitious materials. Three commonly available aluminum compounds, aluminum oxide, aluminum hydroxide and colloidal nano-alumina are applied. The bound chloride content, hydration products and calcium hydroxide content are analyzed. The results show that aluminum compounds transform to AFm phases such as carboaluminate, monosulfoaluminate if there is no available chloride. When the mixing water includes chloride, the above AFms transform to chloroaluminate, e.g. Kuzel’s or Friedel’s salt, depending on the sodium chloride and aluminum compound content. The bound chloride content is significantly improved with aluminum compound addition during the whole curing age, even though in an early age of 3 days. Since aluminum compounds react slower than alumina-containing clinker, the bound chloride content of aluminum compound blended pastes experience a considerable increase after 7 days, whereas that for plain paste is very minor. Generally, admixed chloride promotes the formation of delayed ettringite and this effect can be suppressed by aluminum compound addition due to higher amount of formed AFms. A higher dosage of admixed chloride increases the bound chloride content and reduces the calcium hydroxide as well as free water content in the system.
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发表时间: 2010
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