Effect of metakaolin addition and seawater mixing on the properties and hydration of concrete
Effect of metakaolin addition and seawater mixing on the properties and hydration of concrete
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DOI：
10.1016/j.clay.2015.06.043
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发表时间：
2015-10-01
影响因子：
5.6
通讯作者：
Huang, Yun
中科院分区：
文献类型：
--
作者：
Li, Qiu;Geng, Haining;Huang, Yun
采用分析技术研究了偏高岭土(MK)和海水掺合料对混凝土性能和水化产物的影响。MK在不改变孔隙率的情况下，通过细化孔结构提高了抗压强度。海水增加了早期的抗压强度，但不改变孔结构。MK和海水的结合提高了早期和后期的强度。含有MK的浆体中的水化产物为波兰石、钙矾石、半碳铝酸盐、单碳铝酸盐和C-S-H凝胶。在含有海水的糊状物中，发现了氢解铝石，而不是半碳铝酸盐和单碳铝酸盐。MK促进了水方解石的形成。MK含量随着MK含量的增加和年龄的增加而降低。早期海水中CH含量随着MK含量的增加而增加。这种组合在幼龄时增加了CH含量，后来又降低了。28d时，海水中的大部分氯化物被水合方解石固定。这种组合改善了混凝土在早期和后期的性能。(C)2015爱思唯尔B.V.保留所有权利。
The effect of metakaolin (MK) and seawater mixing on the properties and hydration products of concrete was studied by analytical techniques. MK improved compressive strength by refining pore structure without altering porosity. Seawater increased compressive strength at early age without altering pore structure. The combination of MK and seawater improved both early and later age strength. Hydration products in pastes containing MK were Portlandite, ettringite, hemicarboaluminate, monocarboaluminate and C-S-H gels. In pastes with seawater, instead of hemicarboaluminate and monocarboaluminate, hydrocalumite was identified. MK promoted hydrocalumite formation. MK decreased CH content with increase of MK content and age. Seawater increased CH content at early age with MK content. The combination increased CH content at early age and decreased later. At 28 days, most chloride in seawater was immobilized by hydrocalumite. The combination improved properties of concrete at both early and later age. (C) 2015 Elsevier B.V. All rights reserved.