Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Examination of the Characteristics of Mortar Mixed with Boron Compounds Presenting Various Levels of Alkalinity

다양한 알칼리도를 가진 붕소화합물이 혼입된 모르타르의 특성 검토

  • Lee, Binna (Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Jong-Suk (Korea Institute of Civil Engineering and Building Technology) ;
  • Min, Jiyoung (Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Jang Hwa (Korea Institute of Civil Engineering and Building Technology)
  • 이빛나 (한국건설기술연구원 구조융합연구) ;
  • 이종석 (한국건설기술연구원 구조융합연구) ;
  • 민지영 (한국건설기술연구원 구조융합연구) ;
  • 이장화 (한국건설기술연구원 구조융합연구)
  • Received : 2016.11.02
  • Accepted : 2017.01.17
  • Published : 2017.02.28
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Abstract

This study examines the characteristics of mortar mixed with various boron compounds. The adapted boron compounds, classified into acid, slightly alkaline and strongly alkaline with respect to the value of the pH are acid-based boron (AA), low-alkaline-based boron (AB), and high-alkaline-based boron (HB). The pH test, setting test and compressive strength test are performed to evaluate the physical and chemical properties of mortar, and SEM imaging is conducted to analyze the microstructure of mortar. The measured pH shows that the specimens mixed with boron compounds have lower pH than the basic mortar without boron and that loss of pH occurs according to time. The setting test reveals that the initial and final setting times of the specimens mixed with boron compounds occur later than the basic mortar, which disagrees slightly with the previous literature stating that the setting time can be shortened according to the alkalinity. From the compressive strength test and SEM imaging results, it is recommended to determine the optimal content of boron considering type and composition of the boron compounds.

본 연구에서는 붕소화합물을 혼입하여 제작한 모르타르의 특성에 대한 검토를 수행하였다. 사용된 붕소화합물은 pH 값에 따라 산성 및 약알칼리성, 강알칼리성으로 구분하여 선별한 것으로 산성 기반인 붕산(AA)과 약알칼리 기반의 붕사(AB), 강알칼리성인 붕사(HB)이다. 실험은 모르타르의 물리적 화학적 특성을 파악할 수 있는 pH 측정 및 응결 시험, 압축강도 시험을 수행하였으며 모르타르 내 미세구조 분석을 위해 SEM 촬영을 수행하였다. pH 측정 결과 붕소화합물을 혼입한 시험체 전반적으로 기본 모르타르보다 pH가 낮게 측정되었으며 시간이 지남에 따라 pH가 저하되는 양상을 보였다. 또한, 응결 시험에서도 기본 시험체보다 초결 및 종결 시점이 늦게 발생되었으며 알칼리도에 따라 응결 지연을 저감할 수 있다는 기존 문헌과 다소 다른 결과를 나타냈다. 압축 강도 및 SEM 촬영 결과, 붕소화합물의 종류 및 성분에 따라 강도 등의 물리적 성능이 결정되기 때문에 이를 고려하여 최적 혼입량을 결정하는 것이 바람직할 것으로 판단된다.

Keywords

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