한국건축시공학회지 (Journal of the Korea Institute of Building Construction)

  • 제23권1호
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  • Pages.35-43
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  • 2023
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  • 1598-2033(pISSN)
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  • 2233-5706(eISSN)
한국건축시공학회 (The Korean Institute of Building Construction)
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비소성 황토 결합재를 혼합한 콘크리트의 강도 발현 평가를 위한 초음파 속도법의 검토

A Study on Evaluating the Compressive Strength Development of Concrete Mixed with Non-sintered Hwangto Admixture by an Ultrasonic Method

  • Kim, Jeong-Wook (Department of Architectural Engineering, Chungnam University) ;
  • Kim, Won-Chang (Department of Fire and Disaster Prevention, Semyung University) ;
  • Kim, Gyu-Yong (Department of Architectural Engineering, Chungnam University) ;
  • Lee, Tae-Gyu (Department of Fire and Disaster Prevention, Semyung University)
  • 투고 : 2022.11.15
  • 심사 : 2022.11.30
  • 발행 : 2023.02.20
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초록

본 연구에서는 시멘트 대체 재료로서 비소성 황토(NHT)를 혼합한 콘크리트의 역학적 특성을 평가하였으며, 초음파 속도 분석을 통한 콘크리트의 강도 예측식을 제안하였다. 혼합된 NHT의 시멘트 치환율을 0, 15 및 30%로 설정하였으며, 시멘트 및 NHT의 분체량에 대한 영향을 평가하기 위해 목표 강도를 30 및 45MPa로 설정하였다. 평가한 항목은 압축 강도, 초음파 속도 및 탄성계수로 설정하였으며, 재령 1, 3, 7 및 28일마다 설정한 항목을 측정하였다. 실험 결과, NHT 치환율이 증가함에 따라 역학적 특성은 감소하는 경향을 보였으며. 또한, 압축 강도와 초음파 속도의 상관관계 분석 결과 상관계수(R2)는 NHT를 혼합한 콘크리트의 경우 약 0.95로 높은 관계성을 보였다.

In this study, the mechanical properties of concrete mixed with non-sintered hwangto(NHT) as an alternate material for cement were evaluated, and the compressive strength prediction equation of concrete based on ultrasonic pulse velocity analysis was proposed. Cement replacement rates for mixed NHT were set to 0, 15, and 30%, and design compressive strength was set to 30 and 45MPa to evaluate the effect on the amount of cement and NHT powder. The mechanical properties items analyzed were compressive strength, ultrasonic pulse velocity, and elastic modulus, and were measured on days 1, 3, 7, and 28. As the replacement rate of NHT increased, the mechanical properties tended to decrease. In addition, as a result of analyzing the correlation between compressive strength and ultrasonic pulse velocity, the correlation coefficient(R2) showed a high relationship(R2=0.95) on concrete mixed with NHT.

키워드

과제정보

This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIT)(No.2022R1F1A1073333).

참고문헌

  1. Lee CY, Kim JH, Hyung WG. Properties of non-sintered cement mortar using non-activated hwangto. Journal of Korea Society Waste Management. 2019 Jan;36(1):82-7. https://doi.org/10.9786/kswm.2019.36.1.82 
  2. Malhotra VM. Introduction: Sustainable development and concrete technology. Concrete International. 2002 Jul;24(7):1-22. 
  3. Kim YH, Im JS, Yoo DH, Lee SJ, Bae JS, Son YM, Jeon HS, Lee DH. Intended national determined contribution (INDC) and longterm strategy for low GHG emission of major countries under the Paris agreement. National Institute of Forest Science. 2017 July;727:5-19. 
  4. Heo JO, Lee JK, Hyung WG. Properties of Non-sintered Hwangtoh Mortar Using Eco-Friendly Inorganic Binding Material. Journal of the Korea Concrete Institute. 2014 Aug;26(4):499-506. https://doi.org/10.4334/JKCI.2014.26.4.499 
  5. Sung CY. Engineering Properties for Planting of Porous Concrete Block Containing Rice Straw Ash. 2004 Jun;16(3):311-8.  https://doi.org/10.4334/JKCI.2004.16.3.311
  6. Kim JS. Experimental study on the mechanical properties and functionality of mortar using loess powder [master's thesis]. [DaeJeon (Korea)]: ChungNam National University; 2010. 1-5 p. 
  7. Kim BJ, Choi HB, Kang KI, Yi CK. Characteristics of natural loess (Hwangto) paste subjected to geopolymerization. Journal of the Korea Concrete Institute. 2011 Jan;23(1):121-7.  https://doi.org/10.4334/JKCI.2011.23.1.121
  8. Park SJ, Kim JH, Hyung WG. A study on strength and durability of alkali activated slag mortar by replacement ratio on metakaolin. Journal of Korea Society of Waste Management. 2015 Jan;32(1):70-7. https://doi.org/10.9786/kswm.2015.32.1.70 
  9. Lee SS. A study on the fluidity properties and strength properties of non-sintered hwangtoh mixed with PVA fiber. Journal of the Korea Institute of Building Construction. 2010 Jun;10(3):49-56. https://doi.org/10.5345/JKIC.2010.10.3.049 
  10. JASS 5. Japanese Architectural Standard Specification(JASS 5). Tokyo (Japan): Architectural Institute of Japan; 2009:74-7. 
  11. Pyzsniak J. Method of concrete strength control, in prefabricated slabs. by ultrasound. Build.Sci. 1968 Jan;2(4):331-5. https://doi.org/10.1016/0007-3628(68)90013-3 
  12. Lee TG, Lee JH, Choi HG. Assessment of strength development at hardened stage on high-strength concrete using NDT. Materials. 2020 Sep;10(18):6261. https://doi.org/10.3390/app10186261 
  13. Sua-iam G, Sokrai P, Makul N. Novel ternary blends of Type 1 Portland cement, residual rice husk ash, and limestone powder to improve the properties of self-compacting concrete. Construction and Building Materials. 2016 Oct;125:1028-34. https://doi.org/10.1016/j.conbuildmat.2016.09.002 
  14. Krishna Rao S, Sravana P. Chandrasekhara Raob T. Experimental studies in ultrasonic pulse velocity of roller compacted concrete pavement containing fly ash and M-sand. International Journal of Pavement Research and Technology. 2016 Jul;9(4):289-301. https://doi.org/10.1016/j.ijprt.2016.08.003 
  15. Sung CY, Ryu NH, Youm JN. Physical and mechanical properties of mortar using non-active hwangto and stone dust. Journal of the Korean Society of Agricultural Engineers. 2022 Nov;44(6):83-9. 
  16. Cho YH, Jung HY, Lee SS, Song HY. Engineering properties of mortar according to the replacement ratio of lime and the ratio between non-sintered hwangto and sand. 2008 Autumn Academic Presentation Conference;2008 Dec; Changwon, Korea. Jenju (Korea): The Regional Association of Architectural Institute of Korea; 2008. p. 919-24. 
  17. Demirboga R, Turkmen I, Karakoc MB. Relationship between ultrasonic velocity and compressive strength for high-volume mineral-admixtured concrete. Cement and Concrete Research. 2004 Dec;34(12):2329-36. https://doi.org/10.1016/j.cemconres.2004.04.017