DOI QR코드

DOI QR Code

굴 패각을 잔골재로 활용한 내화모르타르의 잔존강도 특성

Remaining Strength of Fireproof Mortar using the Oyster Shell as a Fine Aggregate

  • Jung, Ui-In (Department of Architectural Engineering, Kongju National University) ;
  • Kim, Bong-Joo (Department of Architectural Engineering, Kongju National University)
  • 투고 : 2017.06.19
  • 심사 : 2017.09.21
  • 발행 : 2017.10.20

초록

본 연구는 산업폐기물로 발생되는 굴 패각을 세척, 건조 및 가공하여 3개의 입도범위로 분급하였다. 이를 이용해 일정한 비율로 잔골재를 대체한 모르타르 실험체를 제작하였으며, 28일 재령을 기준으로 $300^{\circ}C$, $600^{\circ}C$, $900^{\circ}C$의 가열조건에 의해 실험체를 가열하였다. 재령 28일에서 Plain 휨 강도는 9.2MPa로 나타났으며, O 0.15에서는 대체율에 따라 7.9~4.4MPa로 나타났다. O 1.2~2.5에서는 대체율에 따라 7.7~4.4MPa으로 나타났으며, 마지막으로 O 2.5~5.0의 경우에는 대체율에 따라 8.8MPa,~6.1MPa로 나타났다. 재령 28일 압축강도의 경우, O 0.15에서는 대체율에 따라 23.6~43.2MPa의 차이를 나타냈으며, O 1.2~2.5에서는 대체율에 따라 20.4~45.1MPa의 차이로 나타났고, 마지막으로 O 2.5~5.0의 경우 17.1~40.4MPa의 차이가 나타났다. 가열을 통해 잔존강도를 측정한 결과 굴 패각 잔골재 O 0.15 이하를 100% 대체한 경우 강도감소율이 가장 낮은 것으로 나타났으며, 이러한 결과를 통해 굴 패각의 가공 및 적정 배합을 통한 내열성능 발휘가 가능할 것으로 예상된다.

This study classified oyster shells that produced as a industrial waste into 3 distribution by washing, drying and processing them. Mortar specimens with a constant ratio by using this to substitute fine aggregates were made, and the specimens were heated under the heating conditions of $300^{\circ}C$, $600^{\circ}C$ and $900^{\circ}C$ based on the 28-day age. On the age of 28 days, the plain flexural strength was found to be 9.2MPa, and in O 0.15, it was shown to be 4.4~7.9MPa depending on the substitution rate. It was found to be 4.4~7.7MPa in O 1.2~2.5 depending on the substitution rate, and last but not least, it was shown to be 6.1~8.8MPa in case of O 2.5~5.0 depending on the substitution rate. In case of the compressive strength of the 28-day age, it showed the difference of 23.6~43.2MPa in O 0.15 depending on the substitution rate, and 20.4~45.1MPa in O 1.2~2.5 depending on the substitution rate, and last but not least, 17.1~40.4MPa in case of O 2.5~5.0. As a result of measuring the residual strength through heating, in case of substituting fine aggregates less than O 0.15 by 100%, it showed the lowest strength reduction ratio, and it is expected that the heat-resisting property could be achieved through processing and proper mixing of oyster shells through these results.

키워드

참고문헌

  1. Seo CH. Fire material. Journal of the Korea Institute of Building Construction. 2003 Jun;3(2):56-62. https://doi.org/10.5345/JKIC.2003.3.2.056
  2. Pei CC. Fire resistant properties of high strength concrete applying spalling prevention methods and various standard heating curves [Doctor's thesis]. [Cheongju(Korea)]: Cheongju University; 2009. 160 p.
  3. Jung UI. A study on performance of fire-proof board using oyster shell and dry bottom Ash [Master's thesis]. [Cheonan(Korea)]: Kongju National University; 2014. 64 p.
  4. Yoon GL, Kwon OS, Im YJ, Yang EI. Engineering characteristics of waste oyster shell for recycling. Korean Society of Civil Engineers; 2001 Jul;21(4-C):421-31.
  5. Jung UI, Kim BJ. Heating experiment of fireproof board using bottom ash and oyster shell. Proceedings of the Korean Recycled Construction Resource Institute. 2014 Nov 7; Seoul, Korea. Seoul(Korea): Korean Recycled Construction Resource Institute; 2014. p. 60-3.
  6. Korean Standards Association. Methods of testing cements-Determination of strength. KS L ISO 679. 2006.
  7. Kim HS. The study on application of discarded oyster shell powder as an architectural material [Master's thesis]. [Busan(Korea)]: Donga University; 2008. 50 p.