일반모래를 잔골재로 사용한 고연성 시멘트 복합체의 인장거동
Tensile Behavior of Highly Ductile Cementitious Composites Using Normal Sand as Fine Aggregate
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초록
이 연구에서는 PE 섬유를 사용한 고연성 시멘트 복합체에 대해 최대입경 4.75 mm의 일반모래(강모래)를 규사와 서로 다른 비율로 혼합하여 사용하였을 때, 그에 따른 고연성 시멘트 복합체의 인장거동 변화를 실험을 통해 살펴보고자 하였다. 유동성 평가 실험에서는 강모래 치환율이 증가함에 따라 유동성이 증가하는 것으로 나타났다. 압축강도는 평균압축강도에는 큰 차이가 없었으나, 편차의 크기가 강모래 치환율이 증가할수록 증가하는 것으로 나타났다. 일축인장시험 결과에서는 강모래 치환율에 따른 인장강도의 변화는 거의 없는 것으로 나타났으며, 인장변형률 성능에서는 강모래 치환율이 증가함에 따라 향상되는 결과를 나타내었다. 강모래 치환율이 증가함에 따라 다중균열의 분포밀도가 증가하면서 인장변형률 성능의 향상된 것으로 보인다. 한편, 인장변형률 성능의 편차는 압축강도에서와 마찬가지로 강모래 치환율이 증가함에 따라 커지는 양상을 나타내었다. 이 연구를 통해 규사 대신 일반모래를 사용한 경우에도 고연성 시멘트 복합체의 인장거동의 변동성은 증가하지만, 규사를 사용한 고연성 시멘트 복합체와 비교할 때 등가 이상의 인장성능을 나타낼 수 있음을 확인하였다.
Abstract
This study was aimed to investigate the tensile behaviors of PE(Polyethylene) fiber-reinforced highly ductile cementitious composites with different combinations of micro silica sand and normal sand(river sand) with maximum particle size of 4.75 mm. Flow test result indicated the increase of flowability with higher replacement ratio of river sand. There was no noticeable difference in the mean compressive strength with different replacement ratio of river sand, but the variation in the compressive strength increased as higher amount of river sand was adopted for the replacement. The difference in the uniaxial tensile strength was negligible, but the tensile strain capacity was significantly influenced by the replacement ratio of river sand. It is thought that increased density of multiple cracks induced improved tensile strain capacity when higher percentage of river sand was adopted for fine aggregate. The deviation in the strain capacity increased as the replacement ratio of river sand was higher, as in the compressive strength. This study presented the feasibility of using normal sand instead of micro silica sand for highly ductile cementitious composites with equivalent or better uniaxial tensile performance, even though it might increase the deviation in the performance.
참고문헌 (17)
- De Koker, D., "Extrusion of Engineered Cement-Based Composite Material", Proceedings of BEFIB, pp.1301~1310 (2004)
- de Larrard, F., "Optimization of Ultra-High Performance Concrete by the Use of A Packing Model", Cement and Concrete Research, 24(6), pp.997~1009 (1994)
- Fuller, W. B., "The Laws of Proportioning Concrete", Transactions of the American Society of Civil Engineers, 59, pp.67~143 (1907)
- JCI-DFRCC Committee, "DFRCC Terminology and Application Concepts", Journal of Advanced Concrete Technology, 1(3), pp.335~340 (2003)
- Strain Hardening Cement Composites: Structural Design and Performance, State-of-the-Art Report of the RILEMTechnical Committee 208-HFC, "Kanakubo, T.", SC3~ (2013)
- 권성준, "규사 혼입과 플라이애쉬 혼입에 따른 폴리에틸렌 섬유보강 복합재료의 압축및 인장거동", 한국건설순환자원학회 논문집, 4(1), pp.25~30 (2016), 한국건설순환자원학회[DOI]
- 이방연, "그라우팅에 적합한 점성을 갖는 변형률 경화 시멘트 복합재료", 한국구조물진단유지관리공학회 논문집, 16(1), pp.55~63 (2012), 한국구조물진단유지관리공학회
- Lee, B. Y., "Polypropylene Fiber-Based Strain-Hardening Cementitious Composites", Proceedings of the 2013 World Congress on Advances in Structural Engineering and Mechanics (ASEM13), pp.444~457 (2013)
- Li, V. C., "Fiber Reinforced Concrete: Present and the Future", pp.64~97 (1998), CSCE
- Li, V. C., "On Engineered Cementitious Composites (ECC) - A Review of the Materials and its Applications", Advanced Concrete Technology, 1(3), pp.215~230 (2003)
- Li, V. C., "Tensile Strain-Hardening Behavior of PVA-ECC", ACI Materials Journal, 98(6), pp.483~492 (2001)
- Maalej, M., "Effect of Fiber Volume Fraction on the Off-Crack Plane Energy in Strain-hardening Engineered Cementitious Composites", Journal of American Ceramic Society, 78(12), pp.3369~3375 (1995)
- Matsumoto, T., "Mechanisms of Multiple Cracking and Fracture of DFRCC under Fatigue Flexure", Journal of Advanced Concrete Technology, 1(3), pp.299~306 (2003)
- Mechtcherine, V., "Behavior of Strain-Hardening Cement-Based Composites Under High Strain Rates", Journal of Advanced Concrete Technology, 9(3), pp.51~62 (2011)
- Nallthambi, P., "Effect of Specimen and Crack Sizes, Water", Cement Ratio and Coarse Aggregate Texture upon Fracture Toughness of Concrete, 1984, pp.36(129), 227~236
- Shin, S. K., "Investigation of the strengthening effect of DFRCC applied to plain concrete beams", Cement and Concrete Composites, 29(6), pp.465~473 (2007)
- Wang, S., "Lightweight Engineered Cementitious Composites(ECC)", Proceedings of High Performance Fiber Reinforced Cement Composites(HPFRCC4), pp.379~390 (2003)