Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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Compressive Strength and Water Contact Angle Properties of Cement Mortar by Type of Water Repellent

발수제종류별 잔골재 입도에 따른 시멘트 모르타르의 강도 및 발수특성

  • Kang, Suk-Pyo (Department of Construction Engineering, Woosuk University) ;
  • Kang, Hye-Ju (Construction Test and Certification Department, Korea Institute of Civil Engineering and Building Technology) ;
  • Kim, Sang-Jin (Department of Construction Engineering, Woosuk University) ;
  • Suh, Jeong-In (Department of Construction Engineering, Woosuk University)
  • Received : 2021.09.01
  • Accepted : 2021.10.12
  • Published : 2021.12.20
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Abstract

In this study, the compressive strength and water contact angle were measured before and after surface abrasion of mortar specimens prepared by mixing two types of water repellents and two types of sands. In addition, the hydration products and chemical bonding of cement mortar by repellent were examined using X-ray diffraction(XRD), thermogravimetry-differential thermal analysis(TG-DTA), and Fourier-transform infrared spectroscopy(FT-IR) to evaluate the performance of these cement mortar mixtures as repair materials. We found that the compressive strength of the cement mortar with water repellent added was decreased compared to that of the plain cement mortar, and that of the oligomeric system was higher than that of the monomeric system. We further found that the contact angle of mortar with water repellent added was increased compared to that of the plain cement mortar, and that of the oligomeric system was increased compared to that of the monomer.

본 논문은 발수제 첨가 모르타르의 강도 및 발수성에 미치는 다양한 요인 중에서 발수제 종류 및 잔골재 입도에 대한 영향을 검토하고자 하였다. 그 결과 발수제 첨가 시멘트 모르타르의 압축강도는 무첨가 시멘트 모르타르와 비교하여 감소하였고, 올리고머계 발수제 첨가 모르타르의 압축강도는 모노머계 발수제와 비교하여 높게 나타났다. 또한 잔골재 입도에 따른 시멘트 모르타르 압축강도 영향은 크게 나타나지 않았다. 발수제 첨가 모르타르의 접촉각은 무첨가 모르타르와 비교하여 증가하였고, 올리고머계 발수제보다는 모노머계 발수제가 상대적으로 증가하였다. 또한 연마 전후 접촉각은 잔골재 입도에 따라서 상이한 경향을 보이고 있다.

Keywords

Acknowledgement

This work is supported by the Korea Agency for Infrastructure Technology Advancement(KAIA) grant funded by the Ministry of Land, Infrastructure and Transport(Grant 21TBIP-C160747-01).

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