Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
권호 표지
DOI QR코드

DOI QR Code

Effects of Crushed Coal Bottom Ash on the Properties of Mortar with Various Water-to-binder Ratios

다양한 물-결합재비를 갖는 모르타르의 물성에 대한 파쇄 바텀애시의 영향

  • Received : 2016.09.20
  • Accepted : 2016.11.18
  • Published : 2016.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

Effects of crushed coal bottom ash (CBA) with maximum size of 1 mm on the properties of mortar with various water-to-binder ratios (w/b) were evaluated. The present work is a fundamental study to establish a method of mix proportion design for mortar and concrete with CBA. The workability, air contents, and compressive strength of mortar were measured. Efficiency of CBA on the compressive strength at 28 days, which was adopted for mix proportion design, was evaluated based on concepts of 'equivalent strength' in CEN/TR 16637. It was found that the CBA could be contributed as a binder in mortar in some cases, while in other cases act as at aggregates. The efficiency of CBA was influenced by types of CBA and their replacement ratio, and w/b of mortar.

최대 입경 1 mm 이하의 파쇄 바텀애시 혼입이 다양한 물-결합재비를 갖는 모르타르의 성능에 미치는 영향 확인하였다. 이는 파쇄 바텀애시를 혼입한 모르타르 및 콘크리트의 배합설계기법을 성립하기 위한 기초연구로서 수행된 것이다. 모르타르의 유동성 및 공기량, 압축강도가 측정되었다. 배합설계기준인 28일 압축강도를 기반으로 CEN/TR 16637에서 제안한 등가압축강도 개념을 고려하여 파쇄 바텀애시의 강도기여 효율을 평가하였다. 실험결과, 파쇄 바텀애시가 우수한 결합재로서의 역할을 하는 경우도 있는 반면, 골재에 가까운 역할을 하는 경우도 있음을 확인하였다. 파쇄 바텀애시의 효율은 바텀애시의 종류 및 치환률, 모르타르의 w/의 변화에 따라 달라진다.

Keywords

References

  1. Kim, H.K., Lee, H.K., 2015: Coal bottom ash in field of civil engineering: A review of advanced applications and environmental considerations, KSCE Journal of Civil Engineering, 19(6), pp. 1802-1818. https://doi.org/10.1007/s12205-015-0282-7
  2. Kim, K.G., Kim, D.Y., Lee, S.W., 2015: A study on the locational conflicts of thermal power plants - Focused on the construction agreement processes for thermal power plants, Korean Journal of Local Government & Administration Studies, 29(1), pp. 21-44. https://doi.org/10.18398/kjlgas.2015.29.1.21
  3. Korean Recycled Construction Resource Institute, 2014: State-of-art and future technologies on recycled construction resources, Technical report of KRCRI, pp. 464-465. (In Korean)
  4. Korea South-East Power Co., 2016: Annual report on ash recycle, Open API (http://www.koenergy.kr/kosep/fr/main.do)
  5. Andrade, L. B., Rocha, J. C., and Cheriaf, M., 2009: Influence of coal bottom ash as fine aggregate on fresh properties of concrete, Construction and Building Materials, 23(2), pp.609-614. https://doi.org/10.1016/j.conbuildmat.2008.05.003
  6. Kim, H.K., 2015a: Properties of normal-strength mortar containing coarsely-crushed bottom ash considering standard particle size distribution of fine aggregate, Journal of the Korea Concrete Institute, 27(5), pp. 531-539. https://doi.org/10.4334/JKCI.2015.27.5.531
  7. Kim, H.K., 2015b: 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, pp. 57-64. https://doi.org/10.1016/j.conbuildmat.2015.05.017
  8. CEN/TR 16639, 2014: Use of k-value concept, equivalent concrete performance concept and equivalent performance of combinations concept, CEN/TC104.
  9. KS L 5405, 2016: Fly ash, ICS Code 91.100.10; 91.100.50,Korean Agency for Technology and Standards
  10. KS F 4570, 2012: Bottom ash aggregate for precast concrete products, ICS Code 91.100.30,Korean Agency for Technology and Standards
  11. Papadakis, V.G., Tsimas, S., 2002: Supplementary cementing materials in concrete: Part I: efficiency and design, Cement and Concrete Research, 32(10), pp. 1525-1532. https://doi.org/10.1016/S0008-8846(02)00827-X
  12. Babu, K.G., Kumar, V.S.R., 2000: Efficiency of GGBS in concrete, Cement and Concrete Research, 30(7), pp. 1031-1036. https://doi.org/10.1016/S0008-8846(00)00271-4
  13. Yoon, H.S., Yang, K.H, 2015: Determination of water-to-binder ratios on the equivalent compressive strength of concrete with supplementary cementitious materials, 27(6), pp. 687-693. https://doi.org/10.4334/JKCI.2015.27.6.687