한국건설순환자원학회논문집 (Journal of the Korean Recycled Construction Resources Institute)

한국건설순환자원학회 (Korean Recycled Construction Resources Institute)
권호 표지
DOI QR코드

DOI QR Code

저품질의 순환골재를 혼입한 초속경 시멘트 모르타르의 기초물성 및 부피안정성

Basic Properties and Dimension Stability of Ultra Rapid Setting Cement Mortar Containing Low-Quality Recycled Aggregate

  • 전상민 (조선대학교 건축공학과) ;
  • 김형기 (조선대학교 건축공학과)
  • Jeon, Sang-Min (Department of Architectural Engineering, Chosun University) ;
  • Kim, Hyeong-Ki (Department of Architectural Engineering, Chosun University)
  • 투고 : 2021.06.30
  • 심사 : 2021.08.26
  • 발행 : 2021.09.30
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

초속경 시멘트 모르타르에 KS 기준보다 흡수율이 높고 비중이 낮은 저품질의 순환골재가 혼입되었을 때 모르타르의 기초물성과 부피안정성을 실험적으로 확인하였다. 순환골재를 사용하지 않는 배합은 관련 업체에서 사용하고 있는 일반 보수 모르타르의 것을 따랐다. 라텍스 혼입 및 미혼입 배합에 대해 잔골재에 대해 부피비로 15%, 30% 치환하였으며, 모르타르의 슬럼프, 응결시간, 압축/휨강도, 그리고 밀봉/노출 양생에 따른 길이변화량을 확인해 보았다. 실험 결과 저품질의 순환골재가 사용될 때, 사용하지 않은 경우에 비해 24시간 이내 극초기 강도가 최대 50%까지 감소하거나, 건조수축이 최대 2배 까지 증가할 위험이 있는 것을 확인하였다.

The basic properties and volume stability of the ultra-rapid setting cement mortar containing low-quality recycled aggregate with a higher water absorption and lower specific gravity than relavent Korea Standard were experimentally confirmed. The mix proportion without recycled aggregate followed that of the general repair mortar used in the fields. 15% and 30% of the fine aggregate was substituted by the recycled aggregate in the mixtures with and without latex emulsion, and properties and characteristics of the mortar including mortar flow, setting time, compressive and flexural strength, and linear deformation under sealed and unsealed conditions were evaluated. It was confirmed that when low-quality recycled aggregate was used by 30%, there were risks of decrease in the early-age strength by up to 50% within 24h and increases in drying shrinkage by up to 2 times for 2 weeks compared to the the mixtures without the recycled aggregate.

키워드

과제정보

본 연구는 2019년 한국연구재단 기초연구실사업(2019R1A4A1028116)의 지원에 의해 수행되었습니다.

참고문헌

  1. Abate, S.Y., Song, K.I., Song, J.K., Lee, B.Y., Kim, H.K. (2018). Internal curing effect of raw and carbonated recycled aggregate on the properties of high-strength slag-cement mortar, Construction and Building Materials, 165, 64-71. https://doi.org/10.1016/j.conbuildmat.2018.01.035
  2. Ali, U., Shahid, S., Ali, S. (2021). Combined effects of styrene-butadiene rubber(SBR) latex and recycled aggregates on compressive strength of concrete, Journal of Rubber Research, 24(1), 107-120. https://doi.org/10.1007/s42464-020-00077-1
  3. Assaad, J., Daou, Y. (2017). Behavior of structural polymer-modified concrete containing recycled aggregates, Journal of Adhesion Science and Technology, 31(8), 874-896. https://doi.org/10.1080/01694243.2016.1235750
  4. Chaunsali, P., Mondal, P. (2015). Influence of calcium sulfoaluminate(CSA) cement content on expansion and hydration behavior of various ordinary portland cement-CSA blends, Journal of the American Ceramic Society, 98(8), 2617-2624. https://doi.org/10.1111/jace.13645
  5. Choi, H.B., Shin, Y.S., An, S.H., Chung, H.S., Kang, K.I. (2007). A properties and durability of recycled aggregate concrete, Journal of Architectural Institute of Korea, 23(9), 125-132.
  6. Eren, F., Godek, E., Keskinates, M., Tosun-Felekoglu, K., Felekoglu, B. (2017). Effects of latex modification on fresh state consistency, short term strength and long term transport properties of cement mortars, Construction and Building Materials, 133, 226-233. https://doi.org/10.1016/j.conbuildmat.2016.12.080
  7. Kim, H.K. (2015). Utilization of sieved and ground coal bottom ash powders as a coarse binder in high-strength mortar to improve workability, Construction and Building Materials, 91, 57-64. https://doi.org/10.1016/j.conbuildmat.2015.05.017
  8. Lee, W.Y., Lee, D.G., Han, S.I., Kwak, E.G., Kim, J.W., Kim, J.M. (2009). The strength properties of latex-modified mortar using recycled fine aggregate, Journal of the Korea Institute of Building Construction, 9(2), 179-182.
  9. Padmini, A.K., Ramamurthy, K., Mathews, M.S. (2009). Influence of parent concrete on the properties of recycled aggregate concrete, Construction and Building Materials, 23(2), 829-836. https://doi.org/10.1016/j.conbuildmat.2008.03.006
  10. Park, S.H., Jung, S.Y., Kim, H.Y., Choi, K.K. (2019). Mechanical and durability characteristics of latex-modified concrete using ultra rapid hardening cement, Journal of the Architectural Institute of Korea Structure & Construction, 35(5), 153-160. https://doi.org/10.5659/JAIK_SC.2019.35.5.153
  11. Pera, J., Ambroise, J. (2004). New applications of calcium sulfoaluminate cement, Cement and Concrete Research, 34(4), 671-676. https://doi.org/10.1016/j.cemconres.2003.10.019
  12. Sirtoli, D., Wyrzykowski, M., Riva, P., Lura, P. (2020). Autogenous and drying shrinkage of mortars based on Portland and calcium sulfoaluminate cements, Materials and Structures, 53(5), 1-14. https://doi.org/10.1617/s11527-019-1420-3
  13. Yun, K.K., Jung, W.K., Choi, S.R., Kim, D.H., Lee, B.H. (2002). Durability of latex-modified concrete with rapid-setting cement, International Journal of Highway Engineering, 4(2), 1-8.
  14. Zhang, J., Li, G., Ye, W., Chang, Y., Liu, Q., Song, Z. (2018). Effects of ordinary Portland cement on the early properties and hydration of calcium sulfoaluminate cement, Construction and Building Materials, 186, 1144-1153. https://doi.org/10.1016/j.conbuildmat.2018.08.008