PNIPAM温敏凝胶对水泥材料抗硫酸盐侵蚀性能的影响

摘要/Abstract

摘要： 利用自制聚N-异丙基丙烯酰胺(PNIPAM)温敏凝胶制备水泥材料,并开展硫酸盐溶液侵蚀试验,测量试件质量与强度变化;同时采用SEM、MIP和水化热测试等手段,研究PNIPAM凝胶对水泥材料抗硫酸盐侵蚀性能的影响机理。结果表明,PNIPAM凝胶相变会释水,促进水泥材料的水化,改善内部孔结构,提高水泥材料力学性能;质量分数为1.0%的PNIPAM凝胶可降低水泥材料受硫酸盐侵蚀的质量损失和强度损失; PNIIPAM凝胶具有相变特性,可以抵消部分膨胀型侵蚀产物对水泥材料内部造成的破坏,提高水泥材料的抗硫酸盐侵蚀性能。

关键词: 水泥材料, 温敏凝胶, 硫酸盐侵蚀, 孔结构, 干湿循环, 水化热

Abstract: The cement materials were prepared by self-prepared poly N-isopropylacrylamide (PNIPAM) thermosensitive gel, and the sulfate solution attack test was carried out to measure the mass and strength changes of specimens. In addition, SEM, MIP and hydration heat test were used to study the effect mechanism of PNIPAM gel on the sulfate attack resistance of cement materials. The results show that PNIPAM gel phase transition canrelease water, promote the hydration of cement materials, improve the internal pore structure, and enhance the mechanical properties of cement materials.1.0% (mass fraction) PNIPAM gel can reduce the mass loss and strength loss of cement materials subjected to sulfate attack. The PNIPAM gel can counteract the internal damage caused by some expansive erosion products and improve the sulfate attack resistance of cement materials due to its phase transformation characteristics.

Key words: cement material, thermosensitive gel, sulfate attack, pore structure, dry-wet cycle, hydration heat

中图分类号:

TQ172

王振军, 史文涛, 张婷, 李梦, 王泽辉. PNIPAM温敏凝胶对水泥材料抗硫酸盐侵蚀性能的影响[J]. 硅酸盐通报, 2023, 42(2): 429-438.

WANG Zhenjun, SHI Wentao, ZHANG Ting, LI Meng, WANG Zehui. Effect of PNIPAM Thermosensitive Gel on Sulfate Attack Resistance of Cement Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(2): 429-438.

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