Effects of HEC Dispersant and Fiber Content on Compression-sensitivity of Short Carbon Fiber Cement-based Materials
FANG Siyi1, BA Mingfang1,2,*, XU Haofeng1, ZHANG Chenjian1, XIE Jialei1, WANG Zhihao1
1 School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, Zhejiang, China 2 Collaborative Innovation Center of Coastal Urban Rail Transit, Ningbo University, Ningbo 315211, Zhejiang, China
Abstract: In order to improve the compression-sensitivity of CFRCC, the effect of hydroxyethyl cellulose (HEC) on the dispersion characteristics of short carbon fibers in CFRCC was studied, the influence of different HEC content and short carbon fiber content on CFRCC compression-sensitivity was explored by the sensitivity coefficient method, and the pore structure characteristics of the corresponding CFRCC were analyzed according to the electrochemical impedance method and the evaporation water content method, and then the dispersion status of the short carbon fibers in the CFRCC matrix and the interface characteristics between the fibers and the matrix were deeply observed by SEM testing technology. The results show that when the dosage HEC dispersant in CFRCC is 0.4% to 0.6% of the total mass of the cementitious material, it can make CFRCC exert better compression-sensitivity under the condition of enduring its good mechanical properties. When the water-binder ratio of the CFRCC matrix is 0.35, short carbon fiber has the best dispersion effect. Under the same water-binder ratio, with the increase of short carbon fiber content, the flexural strength of CFRCC increases to varying degrees, while the compressive strength decreased gradually. When the volume of short carbon fibers is 0.2%, short carbon fibers do not overlap and cluster with each other in the CFRCC matrix. Considering the compression-sensitivity and mechanical properties, the suitable content range of short carbon fibers in CFRCC is 0.2% to 0.25%.
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2023, Vol. 37 
