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Architectural Institute of Korea (대한건축학회)
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Effect of Cementitious Materials on Compressive Strength and Self-healing Properties of Cement Mortars Containing Chitosan-Based Polymer

  • Jae-In Lee (Dept. of Architectural Engineering, Wonkwang University) ;
  • Chae-Young Kim (Dept. of Architectural Engineering, Wonkwang University) ;
  • Joo-Ho Yoon (Dept. of Architectural Engineering, Wonkwang University) ;
  • Se-Jin Choi (Dept of Architectural Engineering, Wonkwang University)
  • Received : 2023.06.07
  • Accepted : 2023.09.19
  • Published : 2023.09.30
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Abstract

Concrete is widely used in the construction industry; however, it has the disadvantage of deteriorating durability due to cracks occurring because of climate change and shrinkage. In addition, when cement is used as a binder, CO2 emitted during the manu-facturing process accounts for ~8% of global CO2 emissions. In this study, ecofriendly cementitious materials such as blast furnace slag powder and fly ash (FA) were used as cement substitutes in the production of mortar containing a chitosan-based polymer (CP), and their fluidity, compressive strength, and self-healing performance were examined. The 28-day compressive strength of the control sample was ~32.4 MPa (the lowest for all tested samples), while that of the sample containing 5% CP and 20% FA was ~49.6 MPa (the highest for all tested samples) and ~53.1% higher than that of the control sample. Even at a healing age of 56 days, the control sample exhibited the lowest healing performance, whereas the samples containing CP (5%, 10%) and 20% FA demonstrated excellent healing performance. After 28 days, the decrease in crack size for the control sample was minimal; however, for the sample containing only cement and CP, a significant decrease in crack size was observed even after 28 days. This study confirmed that the appropriate use of CP and cementitious materials improves not only compressive strength but also the selfhealing performance of mortar.

Keywords

Acknowledgement

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea, funded by the Ministry of Education (NRF-2019R1I1A3A01049510).

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