Effect of CaO on the Autogenous Shrinkage of Alkali-Activated Slag Mortar
Effect of CaO on the Autogenous Shrinkage of Alkali-Activated Slag Mortar
复制标题
CaO对碱活化矿渣砂浆自收缩的影响
DOI：
10.1155/2021/9918834
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发表时间：
2021-11
影响因子：
--
通讯作者：
Guojie Wang
中科院分区：
文献类型：
--
作者：
Dengdeng Zheng;Tao Ji;Guojie Wang
碱矿渣（AAS）的自收缩显著高于普通波特兰水泥（OPC）。由于自生收缩，混凝土开裂的风险较高，这是广泛使用这种有前途的替代粘结剂的一个关键缺点。研究了CaO掺量对AAS砂浆自收缩性能的影响。采用比较法测定了AAS砂浆的自收缩。用压汞法测定了浆料的孔结构。采用傅里叶变换红外光谱、热重分析、X射线衍射和29 Si固体魔角旋转核磁共振等方法对水泥浆的水化产物进行了分析。结果表明，随着CaO含量的增加，钙钛矿的含量增加。浆料中的CaO导致C-S-H（II）（高刚度）部分取代C-S-H（I）（低刚度）。CaO的加入抑制了AAS的水化反应。CaO的加入抑制了水化过程中C-（A-）S-H聚合度的增加和C-S-H（I）的重排，并抑制了微孔的闭合。因此，随着CaO掺量的增加，AAS砂浆的自收缩减小。
The autogenous shrinkage of alkali-activated slag (AAS) is significantly higher than that of ordinary Portland cement (OPC). The higher risk of concrete cracking due to autogenous shrinkage is a critical drawback to wider use of this promising alternative binder. The effect of CaO content on the autogenous shrinkage of AAS mortar was investigated. The autogenous shrinkage of AAS mortars was determined by comparator. The pore structure of the pastes was determined by mercury intrusion porosimetry. The hydration products of the pastes were determined by Fourier transform-infrared, thermogravimetric analysis, X-ray diffraction, and 29Si solid-state magic-angle spinning nuclear magnetic resonance. The results show that the amount of portlandite increases as CaO content increases. CaO in the paste causes the partial replacement of C-S-H(I) (low stiffness) by C-S-H(II) (high stiffness). The hydration reaction of AAS is inhibited by the addition of CaO. The increase of polymerization degree of C-(A-)S-H and rearrangement of C-S-H(I) during hydration are inhibited by the addition of CaO, and micropores closure is also inhibited. Therefore, the autogenous shrinkage of AAS mortar decreases with the increase of CaO content.
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