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Title |
Tensile and Strain-sensing Properties of Hybrid Fibers Reinforced Strain-hardening Cement Composite (Hy-SHCC) with Different Carbon Nanotube (CNT) Dosages
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Authors |
윤다애(Da-Ae Youn) ; 김지현(Ji-Hyeon Kim) ; 이건철(Gun-Cheol Lee) ; 서수연(Soo-Yeon Seo) ; 윤현도(Hyun-Do Yun) |
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DOI |
https://doi.org/10.4334/JKCI.2020.32.3.285 |
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Keywords |
변형경화형 시멘트복합체(SHCC); 자기감지; 탄소나노튜브(CNT); 인장변형; 게이지 상수(GF) strain-hardening cement composite (SHCC); self-sensing; carbon nanotube (CNT); tensile strain; gauge factor (GF) |
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Abstract |
Smart hybrid steel and polyethylene (PE) fiber reinforced strain-hardening cement composite (smart Hy-SHCC) sensors were manufactured by incorporating carbon nanotube (CNT) into SHCC material. The influence of CNT dosages on the tensile and self-sensing properties of smart Hy-SHCC was investigated. Also, the effect of measurement technique (two-probe and four-probe) on the piezoresistive response of smart Hy-SHCC material. Smart Hy-SHCC was reinforced with 0.5 % steel fiber and 1.0 % PE fiber to give strain hardening and multiple cracking performance to brittle cement composite and included 0.5 % and 1.0 % CNT to enhance self-sensing capacity. Test results show that within 1 % volume fraction of CNT, the addition of CNT improved compressive strength, direct tensile behavior and multiple cracking behavior of smart Hy-SHCC material. The gauge factor of smart Hy-SHCC material from four-probe measurements was higher than that of two-probe method. The best performance as strain sensor was obtained for the Hy-SHCC with 0.5 % CNT, reaching values of gauge factor up to 33 with R2 Pearson’s coefficient above 0.99.
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