Effect of a crystalline admixture on the self-healing capability of high-performance fiber reinforced concretes in service conditions

被引：78
作者：
Escoffres, P. [1 ]
Desmettre, C. [1 ]
Charron, J. -P. [1 ]
机构：
[1] Polytech Montreal, Dept Civil Geol & Min Engn, POB 6079,Stn Ctr Ville, Montreal, PQ H3C 3A7, Canada
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2018年 / 173卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
Self-healing; Crystalline admixture; Fiber reinforcement; Crack openings; Water permeability; Mechanical recovery; SEM observations; Calcite; Aragonite; WATER PERMEABILITY; CRACKED CONCRETE; CEMENTITIOUS COMPOSITES; FLY-ASH; BEHAVIOR; LOAD;
D O I：
10.1016/j.conbuildmat.2018.04.003
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
In presence of water, cracks of reinforced concrete structures can heal naturally or with the help of admixtures. The project aimed to measure the water permeability and self-healing of a high-performance concrete (HPC), a HPC with fibers (HPFRC) and a HPC with fibers and crystalline admixture (HPFRC-CA). Under monotonic loading, HPFRC and HPFRC-CA showed maximal crack widths 39% lower and water permeability 3.1 times inferior than HPC. Under a 7-day constant loading and a continuous water flow, cracks of HPFRC and HPFRC-CA were completely healed in comparison to 60% for those of the HPC. The self-healing kinetics was slower for the HPFRC-CA than for the HPFRC, but a higher load had to be applied in the HPFRC-CA to reach again the initial permeability. SEM observations of self healed products allowed identification of calcite and ettringite in the HPFRC in comparison to aragonite in the HPFRC-CA. (C) 2018 Elsevier Ltd. All rights reserved.
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页码：763 / 774
页数：12
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