双掺矿物添加剂对水泥基材料自修复性能的影响

doi:10.11896/cldb.20120065

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Abstract In order to study the effect of double mineral additives on the early self-healing performance of cement-based materials, silica fume, meta-kaolin, quicklime, expansive agent and Na₂CO₃ were used to replace 10% (mass percent) cement by double mixing. The repair laws of nine kinds of specimens with double mixing ratio under immersion curing and standard curing environment were evaluated by crack observation and water permeability test, and the compressive strength test was conducted before and after water curing. The results show that with the extension of the repair time, the crack width and water permeability coefficient of the double-mixed specimens gradually decrease, and the repair effect under the water immersion environment is better than that under the standard curing environment; the crack repair rate of the specimens mixed with quicklime and silica fume or metakaolin respectively is better. The best effect is the specimens mixed with quicklime and metakaolin, and its 28 d crack repair rate can reach 100% and the water permeability recovery rate can reach 80% under water immersion environment in 28 d.The compressive strength of the specimens can be increased by 10%—30%, reaching 60%—80% of the strength of the undamaged specimens, and the strength improvement effect has a high correlation with the repair degree of crack width and permeability coefficient. The main repair products of the double-mixed specimens containing quicklime are calcium carbonate, calcium hydroxide and magnesium compounds. The repair products mixed with silica fume and metakaolin include calcium silicate hydrate, calcium aluminosilicate hydrate and some aluminum phase compounds.

Key words： self-healing mineral admixture cement-based material double mixing

Published: 10 March 2022 Online: 2022-03-08

CLC number:

TU52

Fund:Shandong Natural Science Foundation Youth Fund of Shandong Province of China (ZR2019QEE017), the National Natural Science Foundation Youth Fund of China (51908327) and Special Fund Support Project for Basic Research Business Fee of Shandong University (31560078614117).

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	Articles by authors
	WANG Kai
	CHEN Fanyu
	CHANG Honglei
	ZUO Zhiwu
	LIU Jian

Cite this article:

WANG Kai,CHEN Fanyu,CHANG Honglei, et al. Effect of Double Mineral Additives on Self-healing Performance of Cement Based Materials[J]. Materials Reports, 2022, 36(5): 20120065-7.

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http://www.mater-rep.com/EN/10.11896/cldb.20120065 OR http://www.mater-rep.com/EN/Y2022/V36/I5/20120065

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