钢渣-偏高岭土基导电地聚合物的压敏性能研究

doi:10.11896/cldb.22040039

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Abstract Conductive geopolymer was prepared with steel slag and metakaolin as main raw material. Meanwhile the influence of steel slag mixing amount and curing temperature on compressive strength, electrical resistivity, piezoresistive property and microstructure were analyzed, and then piezoresistive property was evaluated. The results show that with the increase of curing period and curing temperature, compressive strength of specimen is all increased somewhat, among which the compressive strength is the highest when steel slag mixing amount is 30%. Another, at different curing temperatures, the more the steel slag is mixed, the lower the electrical resistivity of specimen. Increase of curing temperature improves early physical and mechanical properties of specimen. However, with the growth of curing period, influence of temperature on the electrical resistivity of specimen becomes weaker. In addition, under the stress of cyclic compression load, the optimal strain sensitivity of specimen is 40.35—50.31, which is much higher than that of the resistance strain sheet (strain sensitivity is 2). Among them, when curing temperature is 40 ℃ and steel slag mixing amount is 30%, the correlation coefficient R² between FCR and cyclic compression stress is as high as 0.953, and the piezoresistive stability is optimal. At last, microscopic analysis shows that when curing temperature is 60 ℃, microstructure is the most compact and has the best stability, resulting in a low strain sensitivity. At the same curing temperature, with increase of steel slag mixing amount, the density of specimen is first enhanced and then weakened, and the SS-30 group is optimal, which is in good agreement with the strength results. Obviously, the steel slag-metakaolin based conductive geopolymer will be an ideal piezoresistive matrix material.

Key words： conductive geopolymer piezoresistive property compressive strength steel slag mixing amount curing temperature

Published: 25 March 2024 Online: 2024-04-07

CLC number:

TU528.41

Fund:National Natural Science Foundation of China (12162010), Science Technology Base and Talent Special Project of Guangxi (AD19245143), and Natural Science Foundation of Guangxi (2021GXNSFAA220087).

Corresponding Authors: ^*shawvivi@163.com

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	MA Bin
	HUANG Qiqin
	XIAO Weiwei
	HUANG Xiaolin

Cite this article:

MA Bin,HUANG Qiqin,XIAO Weiwei, et al. Piezoresistive Property of Steel Slag-Metakaolin Based Conductive Geopolymer[J]. Materials Reports, 2024, 38(6): 22040039-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22040039 OR http://www.mater-rep.com/EN/Y2024/V38/I6/22040039

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