Effects of LiAl-layered double hydroxides on early hydration of calcium sulphoaluminate cement paste
Effects of LiAl-layered double hydroxides on early hydration of calcium sulphoaluminate cement paste
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LiAl层状双氢氧化物对硫铝酸钙水泥浆体早期水化的影响
DOI：
10.1007/s11595-017-1717-4
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发表时间：
2017-10
期刊：
影响因子：
--
通讯作者：
Yanan GUO
中科院分区：
文献类型：
--
作者：
Lei YANG;Songhui LIU;Jianwu ZHANG;Yanan GUO
层状双氢氧化物作为一种三维微纳材料，在许多领域有着广泛的应用，尤其是在增强复合材料方面。本文采用水热法制备了LiAl-LDHs。为了研究LiAl-LDHs对硫铝酸钙水泥浆体早期水化的影响，采用X射线衍射仪、傅立叶变换红外光谱仪、扫描电子显微镜和差示扫描量热仪对其抗压强度、凝结时间和水化热进行了测试。结果表明，LiAl-LDHs能显著提高硫铝酸钙水泥浆体的早期抗压强度，缩短凝结时间。此外，随着LiAl-LDHs含量的增加，5h内的水化放热速率加快。此外，LiAl-LDHs的加入没有导致新相的形成，但增加了水化产物的数量，提供了更高的抗压强度、更短的凝结时间和更致密的组织。
As a 3D micro-nano material, layered double hydroxides have been widely used in many fields, especially for reinforced composite materials. In this paper, LiAl-LDHs was obtained by a hydrothermal method. In order to investigate the effects of LiAl-LDHs on the early hydration of calcium sulphoaluminate (CSA) cement paste, compressive strength, setting time and hydration heat were tested while X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scaning electron microscopy (SEM) and differential scanning calorimetry (DSC) analysis were employed. The results indicated that LiAl-LDHs could significantly improve the early compressive strength and shorten the setting time of calcium sulphoaluminate cement paste with 3wt% concentration. Besides, the hydration exothermic rate within 5 h was accelerated with increasing LiAl-LDHs content. Moreover, the addition of LiAl-LDHs did not result in the formation of a new phase, but increased the quantity of hydration products providing higher compressive strength, shorter setting time and denser microstructure.
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