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SHEN Ai-qin, YANG Jing-yu, GUO Yin-chuan, QIN Xiao, LI Peng. Review on cement concrete internally cured by SAP[J]. Journal of Traffic and Transportation Engineering, 2021, 21(4): 1-31. doi: 10.19818/j.cnki.1671-1637.2021.04.001
Citation: SHEN Ai-qin, YANG Jing-yu, GUO Yin-chuan, QIN Xiao, LI Peng. Review on cement concrete internally cured by SAP[J]. Journal of Traffic and Transportation Engineering, 2021, 21(4): 1-31. doi: 10.19818/j.cnki.1671-1637.2021.04.001
shu

Review on cement concrete internally cured by SAP

doi: 10.19818/j.cnki.1671-1637.2021.04.001

  • School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

Funds:

National Natural Science Foundation of China 51778061

Natural Science Basic Research Program of Shaanxi 2020JZ-22

Innovation Ability Training Program for Doctoral Students in Chang'an University 300203211214

More Information
  • Author Bio:

    SHEN Ai-qin(1957-), female, professor, PhD, saq6305@163.com

  • Corresponding author: YANG Jing-yu(1994-), male, doctoral student, geloushaoyu@126.com
  • Received Date: 2021-03-05
  • Publish Date: 2021-08-01
    Abstract
  • The material properties of a superabsorbent polymer (SAP) were analyzed. Key parameters of mix ratio designs for SAP internally curing concrete were evaluated. A design method for internally cured concrete was developed. The water transmission mechanism of SAP internally curing concrete was investigated from the perspective of the water absorption and water release behavior of the SAP and the hydration characteristics of concrete. The shrinkage and crack resistance, mechanical properties, and durability of SAP internally curing concrete were examined. Its performance enhancement mechanism was explored by considering the characteristics of the interfacial transition zone, hydration products, and pore structure. The engineering applications of SAP internally curing concrete at home and abroad, as well as future research directions and application prospects, were identified. Analysis results show that the principle of SAP internally curing concrete relies on its water absorption and release characteristics. However, there is some variability in the performance of internally cured cement concrete because of the differences in SAP performance and concrete mix ratio and other factors. SAP, as a result of osmotic pressure and ionic concentration, is able to release water over time to replenish the loss of water inside the concrete, reduce the early heat of hydration, and enhance the later hydration. The properties of SAP internally curing concrete are affected by its particle size and admixture amount, and additional water quantity. SAP can effectively suppress the self-shrinkage and drying shrinkage and enhance the mechanical properties of concrete when all the parameters are suitable. SAP can also promote the hydration reaction, generate more hydration products, fill pores of concrete, enhance the compactness of concrete, refine the pore structure, and break off the connected pores, thereby improving the durability of concrete, including its frost resistance and impermeability. The reswelling ability of SAP can block concrete cracks and generate hydration products, such as CaCO3, to enable concrete to self-heal. The curing effects of SAP can enhance the adhesion between cement stones and aggregates, reduce or even eliminate the microcracks in the interfacial transition zone, and improve the strength of the interfacial transition zone. The SAP internally curing concrete can be successfully applied to bridge deck integrative layers, cross diaphragms, wet joints, bridge piers, tunnel secondary linings, etc. with an excellent anti-cracking effect. 46 figs, 137 refs.

     

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