Improving Shrinkage and Cracking Resistance of Manufactured Sand Concrete Through Internal Curing with Super-Absorbent Polymer

doi:10.16552/j.cnki.issn1001-1625.2024.1471

Abstract

Abstract: To enhance the crack resistance of manufactured sand concrete in the arid and cold northwest environment(temperature 5 ℃,humidity 30%), super-absorbent polymer (SAP) was used as an internal curing material. Drying shrinkage, autogenous shrinkage, flat crackingand and compressive strength tests were conducted to analyze the effect of SAP on the early-age shrinkage cracking and mechanical properties of manufactured sand concrete. Isothermal calorimetry and thermogravimetric analysis were utilized to study the impact of SAP internal curing on cement hydration. The results indicate that SAP can effectively increase the early hydration degree of cementitious materials, reduce the risk of shrinkage and cracking of manufactured sand concrete in the arid and cold northwest environment, extend the cracking time of manufactured sand concrete, and reduce the cracking area. The effect of SAP after water absorption treatment is more significant, and the optimal SAP pre-absorption capacity is 6%. Further analysis through thermogravimetric and hydration heat tests reveal that SAP improves internal humidity through a water absorption and slow-release mechanism, prolonging the hydration reaction time and thereby enhancing crack resistance. However, the introduction of SAP increases porosity, leading to decrease concrete strength.

Key words: arid and cold environment, super-absorbent polymer, manufactured sand concrete, drying shrinkage, cracking

CLC Number:

TU528.1

ZHANG Wenlong, FENG Taotao, WANG Fengjuan, ZHANG Yu, WANG Xi, JIANG Jinyang. Improving Shrinkage and Cracking Resistance of Manufactured Sand Concrete Through Internal Curing with Super-Absorbent Polymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(7): 2447-2457.

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