Effect of Double Mineral Additives on Self-healing Performance of Cement Based Materials
WANG Kai1, CHEN Fanyu2, CHANG Honglei3, ZUO Zhiwu1, LIU Jian3
1 Shandong Expressway Group Co., Ltd, Jinan 250002, China 2 School of Civil Engineering, Shandong University, Jinan 250061, China 3 School of Qilu Transportation, Shandong University, Jinan 250002, China
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.
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2022, Vol. 36 
