Mechanical properties and antifreeze performance of cement-based composites with liquid paraffin/diatomite capsule low-temperature phase change
Mechanical properties and antifreeze performance of cement-based composites with liquid paraffin/diatomite capsule low-temperature phase change
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DOI：
10.1016/j.conbuildmat.2022.127773
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发表时间：
2022-07
影响因子：
7.4
通讯作者：
Zhi-yong Liu;C. Zang;Yunsheng Zhang;Jin-yang Jiang;Zheng-cheng Yuan;Guojian Liu;Hua-jian Li
中科院分区：
文献类型：
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作者：
Zhi-yong Liu;C. Zang;Yunsheng Zhang;Jin-yang Jiang;Zheng-cheng Yuan;Guojian Liu;Hua-jian Li
冻融循环是混凝土在服役过程中最常见、最严重的破坏因素之一。研究重点是突破传统混凝土材料被动抗冻性的瓶颈。基于相变储放热原理，采用可控组装法制备了液体石蜡/石蜡微胶囊相变材料。采用现代表征手段对其物理化学性能和热性能进行了研究。同时将其引入水泥基体中，探讨其对混凝土材料导热性能、力学性能和抗冻性的具体影响。结果表明，液体石蜡/石蜡胶囊相变材料水泥基试块具有稳定的化学性能和优异的热性能。耐热极限为280 ℃。加入液体石蜡/石蜡胶囊相变材料会削弱水泥基体的导热性和力学性能，但同时会显著提高水泥基体的抗冻性。冻融循环后的质量损失可减少47%，抗压强度损失和抗折强度损失分别减少186%和99%。液体石蜡/石蜡胶囊相变材料对水泥基体抗折强度的负面影响大于抗压强度。
Freezing-thawing cycles is one of the most common and severe factors to concrete in service. The research focuses on breaking through the bottleneck of passive frost resistance of traditional concrete materials. Based on the principle of phase change heat storage and release, liquid paraffin/diatomite microcapsule phase change material was prepared by controllable assembly method. Its physical and chemical properties and thermal properties were explored by modern characterization methods. At the same time, it is introduced into the cement matrix to explore its specific effects on the thermal conductivity, mechanical properties and frost resistance of concrete materials. The results show that liquid paraffin/diatomite capsule phase change materials (CPCMs) cement-based test block has stable chemical properties and excellent thermal properties. The heat resistance limit is 280 ℃. Adding liquid paraffin/diatomite capsule phase change material will weaken the thermal conductivity and mechanical properties of cement matrix, but at the same time, it will significantly improve the frost resistance of cement matrix. The mass loss after freeze–thaw cycles can be reduced by 47%, the compressive strength loss and flexural strength loss are reduced by 186% and 99%, respectively. The negative effect of liquid paraffin/diatomite capsule phase change material on the flexural strength of the cement matrix is greater than the compressive strength.