The Self-Degradation Mechanism of Polyvinyl Chloride-Modified Slag/Fly Ash Binder for Geothermal Wells
The Self-Degradation Mechanism of Polyvinyl Chloride-Modified Slag/Fly Ash Binder for Geothermal Wells
复制标题
地热井用聚氯乙烯改性矿渣/粉煤灰粘结剂的自降解机理
DOI：
10.3390/en12142821
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发表时间：
2019-07
期刊：
影响因子：
3.2
通讯作者：
Xia Bairu
中科院分区：
文献类型：
--
作者：
Tan Huijing;Zheng Xiuhua;Chen Long;Liu Kang;Zhu Wenxi;Xia Bairu
聚氯乙烯(PVC)在热降解过程中释放出盐酸(HCl)，盐酸与碱活性粘结剂的水化产物发生反应。根据聚氯乙烯的这一特性和地热井开发过程中的温度变化，将聚氯乙烯添加到矿渣/飞灰粘结剂中，研制出自降解材料。测试了聚氯乙烯在不同阶段的热降解性能、抗压强度、水化产物和粘结剂的微观结构，以研究材料的降解机理。结果表明，当聚氯乙烯用量为20%时，复合材料的抗压强度降低，粘结剂含量由13.95%降至76.63%。聚氯乙烯促进材料降解的机理主要包括：(1)在高温下，聚氯乙烯的热降解增加了材料中多个损伤气孔的数量；(2)聚氯乙烯热降解产生的HCl与粘结剂凝胶反应，使其破碎成颗粒；(3)HCl还与粘结剂中的其他物质反应，包括孔溶液中的CaCO3和NaOH。
Polyvinyl chloride (PVC) releases hydrochloric acid (HCl) during its thermal degradation, and hydrochloric acid can react with hydration products of alkali-activated binders. According to this characteristic of PVC and the temperature change that occurs during the development of a geothermal well, the PVC was added into slag/fly ash binder to develop self-degradable materials. The thermal degradation properties of PVC, compressive strength, hydration products, and microstructure of binders at different stages were tested, in order to study the degradation mechanism of the material. It was found that 20% PVC reduced the compressive strength, decreasing the level of binder from 13.95% to 76.63%. The mechanism of PVC promoting the material degradation mainly includes the following: (1) the thermal degradation of PVC increases the number of multiple damage pores in the material, at a high temperature; (2) HCl generated by the PVC thermal degradation reacts with the binder gels, and breaks them into particles; and (3) HCl also reacts with other substances in the binder, including CaCO3 and NaOH in the pore solution.
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