Crack Repairability of Cementitious Materials by Superabsorbent  Polymers in Different Environmental Solutions

Abstract

Abstract: Cracking and repair of concrete have always been the focus of attention in engineering field. Superabsorbent polymers (SAP) have a certain crack self-healing function. In this paper, the liquid absorption properties of SAP under different environmental solutions (NaOH, NaCl and distilled water) were tested. The compressive strength recovery rate of cracked specimens, the self-healing rate of different crack widths (0.1, 0.2 mm ) and the crack filling state were used as repair indicators. The repair effect of SAP with different mass fractions (0%, 0.5%, 1.0%) on cracked mortar specimens under different environmental solutions was analyzed. The results show that the liquid absorption rate of SAP in different environmental solutions increases rapidly and then tends to be stable, and the liquid absorption rate of SAP in NaOH environmental solution is the highest. The incorporation of SAP improves the compressive strength recovery rate of cracked mortar specimens under different environmental solutions to a certain extent. Among them, the compressive strength recovery rate of specimens mixed with 0.5% SAP in NaOH environmental solution for 28 d is the highest, which is 17% higher than that of reference group. The incorporation of SAP improves the self-healing properties of mortar specimens with different crack widths in different environmental solutions. With the increase of SAP content, the self-healing properties of mortar specimens with 0.2 mm crack width repaired in NaOH environmental solution for 28 d is significantly higher than that of distilled water and NaCl solution. The self-healing rate of specimens with 1.0% SAP in NaOH environmental solution is 90%. The incorporation of SAP cooperates with hydration products to seal the crack mouth, so it is beneficial to improve the durability of cement mortar.

Key words: environmental solution, superabsorbent polymer, mortar, crack, compressive strength, self-healing

CLC Number:

TU528

YANG Shijie, ZHANG Shiping, NIU Longlong, ZHANG Shouwei. Crack Repairability of Cementitious Materials by Superabsorbent Polymers in Different Environmental Solutions[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(6): 2012-2021.

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Crack Repairability of Cementitious Materials by Superabsorbent Polymers in Different Environmental Solutions

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