HEC分散剂和纤维掺量对短切碳纤维水泥基材料压敏性的影响

doi:10.11896/cldb.22020152

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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%.

Key words： carbon fiber reinforced cement-based composites dispersant compression-sensitivity short carbon fiber

Published: 10 August 2023 Online: 2023-08-07

CLC number:

TU528.582

Fund:National Natural Science Foundation of China (51978346) and the Collaborative Innovation Center of Coastal Urban Rail Transit in Ningbo University (XT2021013).

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	Articles by authors
	FANG Siyi
	BA Mingfang
	XU Haofeng
	ZHANG Chenjian
	XIE Jialei
	WANG Zhihao

Cite this article:

FANG Siyi,BA Mingfang,XU Haofeng, et al. Effects of HEC Dispersant and Fiber Content on Compression-sensitivity of Short Carbon Fiber Cement-based Materials[J]. Materials Reports, 2023, 37(15): 22020152-9.

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http://www.mater-rep.com/EN/10.11896/cldb.22020152 OR http://www.mater-rep.com/EN/Y2023/V37/I15/22020152

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