Effect of PNIPAM Thermosensitive Gel on Sulfate Attack Resistance of Cement Materials

Abstract

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

CLC Number:

TQ172

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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