[논문]2단계 배합방법으로 제조된 순환굵은골재 콘크리트의 장기재령 역학적 성능 및 내구성 평가

정철우; 김영찬; 허성욱; 손정진

doi:10.14190/jrcr.2022.10.4.475

2단계 배합방법으로 제조된 순환굵은골재 콘크리트의 장기재령 역학적 성능 및 내구성 평가
Evaluation on Long-term Mechanical Performance and Durability of Recycled Coarse Aggregate Concrete Produced by Two-stage Mixing Approach 원문보기

Journal of the Korean Recycled Construction Resources Institute = 한국건설순환자원학회 논문집, v.10 no.4, 2022년, pp.475 - 481

정철우 (부경대학교 건축공학부) , 김영찬 (부경대학교 건축공학부) , 허성욱 (부경대학교 건축.소방공학부) , 손정진 (부경대학교 건축.소방공학부)

초록
AI-Helper

순환골재는 생산과정에서 발생하는 미세균열 및 순환골재 표면에 존재하는 시멘트 페이스트 성분의 존재로 인해, 천연골재에 비해 높은 흡수율을 가지며, 이로 인해 콘크리트에 골재로서 사용할 경우 작업성 저하, 강도의 저하 등의 문제가 발생하게 된다. 골재의 수급이 점점 어려워지고 있는 현 상황에, 골재 수급의 대안이 될 수 있는 순환골재를 적극적으로 활용하기 위한 방법으로, 본 연구에서는 Tam et al.이 제안한 2단계 배합과정을 활용하였고, 이를 이용해 제조한 콘크리트의 압축강도, 탄성계수, 및 염소이온 확산계수를 일반 배합과정을 적용한 천연골재 콘크리트 및 100 % 치환율의 순환골재 콘크리트와 비교 분석하였다. 실험 결과에 따르면, 압축강도와 탄성계수는 물시멘트비에 관계없이, 2단계 배합방법으로 제작한 순환골재 콘크리트가 일반배합과정으로 배합된 순환골재 콘크리트에 비해 높게 나타났으며, 천연골재 콘크리트에 근접하는 역학적 성능을 발휘하였다. 그러나 염소이온 확산계수의 경우 순환골재 콘크리트가 천연골재 콘크리트보다 높게 측정되었으며, 2단계 배합과정의 적용에 따른 염소이온 확산계수의 감소는 확인할 수 없어, 2단계 배합이 내구성에는 크게 기여하지 않는 것으로 판단된다.

Abstract ▼ AI-Helper

Recycled aggregates show high water absorption rate compared to natural aggregates due to microcrack developed during production process and adhered cement pastes at the surface of recycled aggregates. This leads to the deterioration of mechanical properties and slow work flow. Currently it is getting hard to satisfy high demand for natural aggregates. Utilizing recycled aggregate more widely may be a substitutable countermeasure for the shortage of natural resources. In this study, two-stage mixing approach(TSMA) suggested by Tam et al. is used to produce recycled aggregate concrete(RAC) with 100 % replacement of coarse natural aggregate and tests for compressive strength, elastic modulus, and chloride ion diffusion coefficient are conducted to find out the effect of TSMA compared to normal mixing method. According to experimental result compressive strength and elastic modulus of RAC with TSMA was superior to those of RAC with normal mixing irrespective of water-cement ratio, and in some cases mechanical properties of RAC with TSMA approached to those of natural aggregate concrete(NAC). However, chloride ion diffusion coefficient of RAC was higher than that of NAC. This illustrates that TSMA is not an appropriate method in reducing chloride ion diffusion coefficient, resulting in inconsequential contribution of TSMA to the durability of RAC.

주제어

표/그림 (10)

표 Table 1. Chemical compositions of type I ordinary portland cement (%)
그림 Fig. 1. The images of elastic modulus measurement set-up
표 Table 2. Mix proportions of concrete
그림 Fig. 2. Schematic diagram of chloride ion migration test
그림 Fig. 3. Chloride ion diffusion depth measurement
그림 Fig. 4. w/c 0.3 concrete load-displacement graph
그림 Fig. 5. w/c 0.5 concrete load-displacement graph
그림 Fig. 6. Compressive strengths of concrete specimens
그림 Fig. 7. Elastic modulus of concrete specimens
그림 Fig. 8. Chloride ion coefficient of concrete specimens

참고문헌 (19)

American Society for Testing and Materials C 192. (2020). Standard？Practice for Making and Curing Concrete Test Specimens in the？Laboratory, West Conshohocken; ASTM International.
American Society for Testing and Materials C 469. (2020). Standard？Test Method for Static Modulus of Elasticity and Poisson's Ratio？of Concrete In Compression, West Conshohocken; ASTM？International.
Choi, H.B. (2015). Water absorbtion controlling type surface？treatment method for quality enhancement of recycled？aggregate, Journal of the Korea Institute of Building Construction,？15(6), 561-567 [in Korean].

원문보기 상세보기
Choi, W.Y. (2019). Quality standards for republic of Korea and？foreign replacement aggregates, Magazine of RCR, 14(2), 77-83？[in Korean].

원문보기 상세보기
Jeong J.D., Lee D.H. (2008). A study for improvement of testing？methods for quality control of recycled aggregate, Journal of the？Korea Institute of Building Construction, 8(4), 105-114 [In？Korean].
Kim, J.M., Kang, K.W. (2020). The current status and？countermeasures on the supply and demand of aggregate,？Magazine of the Korea Concrete Institute, 32(4), 14-20 [in？Korean].
Kim, N.W., Kim, H.J., Bae, J.S. (2008). A study on the property？estimation of recycled coarse aggregate and characteristic of？recycled aggregate concrete using the surface coated treatment？method, KSCE Journal of Civil and Environmental Engineering？Research, 28(4A), 603-609 [in Korean].
Kim, Y.J., Kim, G.W., Chung, C.W. (2020). Contribution of two-stage？mixing approach on compressive strength of mortar made of？recycled fine aggregate, Journal of the Korean Recycled？Construction Resources Institute, 8(4), 490-497 [in Korean].
Kisku, N., Rajhans, P., Panda, S.K., Pandey, V., Nayak, S. (2020).？Microstructural investigation of recycled aggregate concrete？produced by adopting equal mortar volume method along with？two stage mixing approach, Structures, 24, 742-753.

상세보기
Korea Institute of Construction Technology(KICT). (2014). Study on？Activation Measure of Recycled Aggregate, Report No.？11-161300-000638-01, Ministry of Land, Infrastructure and？Transport, Goyang, Gyeonggido, 3-34 [in Korean].
Kwon, K.C. (2006). Revision details of laws and enforcement？ordinance and regulations on recycling promotion of？construction wastes, Magazine of RCR, 2(2), 13-17 [in Korean].
Nordtest. (1999). Concrete, Mortar and Cement Based Repair？Materials: Chloride Migration Coefficient from Non-Steady-State？Migration Experiments, NT BUILD 492, Nordtest.
Park, S.H., Choi, J.H., Lee, C.Y., Koo, M.S., Chung, C.W. (2022).？Investigation on fire resistance of h igh-performance cement？motar with recycled fine aggregate mixed by two-stage mixing？approach, Journal of the Korean Recycled Construction？Resources Institute, 10(1), 23-29 [in Koreans].
Sim, H.S., Park, C.W., Park, S.J., Kim, H.J., Kim, T.G., Lim, C.H.？(2006). Development of Recycling & Practical Using for Value？Added Resourcing of the Recycled Aggregate Obtained from？Waste-Concrete, The Final Report of Hanyang University's？Industrial-Academic Cooperation Group [in Korean].
Tam, V.W.Y., Gao, X.F., Tam, C.M. (2005). Microstructural analysis？of recycled aggregate concrete produced from two-stage mixing？approach, Cement and Concrete Research, 35(6), 1195-1203.

상세보기
Tam, V.W.Y., Gao, X.F., Tam, C.M. (2006). Comparing performance？of modified two-stage mixing approach for producing recycled？aggregate concrete, Magazine of Concrete Research, 58(7),？477-484.

상세보기
Tam, V.W.Y., Tam, C.M. (2007). Assessment of durability of？recycled aggregate concrete produced by two-stage mixing？approach, Journal of Materials Science, 42(10), 3592-3602.

상세보기
Tam, V.W.Y., Tam, C.M. (2008). Diversifying two-stage mixing？approach(TSMA) for recycled aggregate concrete: TSMAs and？TSMAsc, Construction and Building Materials, 22(10), 2068-2077.

상세보기
Tam, V.W.Y., Tam, C.M., Wang, Y. (2007). Optimization on？proportion for recycled aggregate in concrete using tow-stage？mixing approach, Construction and Building Materials, 21(10),？1928-1939.？

상세보기

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