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Investigation on the Self-Healing Performance of Cement Mortar Incorporating Inorganic Expansive Additives

무기질계 팽창재가 포함된 시멘트 모르타르의 자기치유성능에 관한 연구

  • Shin, Jin-Wook (Department of Acrhitectural Engineering, Hanyang University) ;
  • Her, Sung-Wun (Department of Acrhitectural Engineering, Hanyang University) ;
  • Bae, Sung-Chul (Department of Acrhitectural Engineering, Hanyang University)
  • 신진욱 (한양대학교 건축공학과) ;
  • 허성원 (한양대학교 건축공학과) ;
  • 배성철 (한양대학교 건축공학과)
  • Received : 2020.09.18
  • Accepted : 2020.10.12
  • Published : 2020.12.30

Abstract

Herein, the properties and self-healing performance of cement mortar incorporating calcium sulfoaluminate(CSA), crystalline admixture(CA), and magnesium oxide(MgO) were investigated. Mortar strength test and water permeability experiments were conducted to analyze self-healing performance of the mortar. Also, variation in crack width were measured via digital optical microscope observation. The hydration products formed in the crack via self-healing were analyzed using x-ray diffraction(XRD), thermogravimetry(TG), and digital optical microscope. The analysis revealed that compressive strength and tensile strength increased as CA substitutional ratio increased. However, in the case of MgO replacement, the compressive strength and tensile strength decreased as the CA substitution ratio increased. The products in the recovered cracks are found to be mostly Ca(OH)2, MgCO3, and CaCO3. CaCO3 was shown to be the main healing product and had a higher portion than Ca(OH)2 and MgCO3 in the recovery products. Moreover, the optimal mix derived via water permeability and crack width results was 8% CSA + 1% CA + 2.5% MgO.

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