Effect of Three-dimensional Graphene-Carbon Nanotubes on the Smart Performance of Ultra-high Performance Concrete
LIU Jintao, CUI Jiaowei, ZHOU Yu, QIAN Rusheng, KONG Deyu*
1 College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, China 2 Key Laboratory of Civil Engineering Structure & Disaster Prevention and Mitigation Technology of Zhejiang Province, Hangzhou 310023, China
Abstract: Three-dimensional graphene-carbon nanotubes (Graphene-CNT, GC) were incorporated with ultra-high performance concrete (UHPC) in this work. The effects of GC content, loading amplitude, loading speed, temperature and water content on the resistivity variation pattern of UHPC were analyzed based on the four-electrode method. The results showed that the GC content has little effect on the 28 d compressive strength of UHPC. UHPC resistivity decrease gradually with the increase of GC content, and the resistivity of UHPC with 2.0wt%GC decreased by 55.1% compared with the control group. UHPC resistivity decreased with increasing internal relative water content, and there was a good linear relationship between relative water content and resistance. UHPC resistivity decreased with increasing temperature, and the natural logarithm of resistivity was linearly related to the inverse of the absolute temperature. The amplitude of resistivity change of UHPC increased with the increase of loading amplitude and showed excellent piezoelectric properties and electric conductivity. Moreover, the compressive stress and strain sensitivity coefficients of UHPC specimens with 1.2wt%GC reached 0.2%/MPa and 85.2, respectively.
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2024, Vol. 38 
