Bacteria-based self-healing concrete exposed to frost salt scaling

被引：15

作者：

Cappellesso, Vanessa Giaretton ^{[1
,2
]}

Van Mullem, Tim ^{[1
]}

Gruyaert, Elke ^{[2
]}

Van Tittelboom, Kim ^{[1
]}

De Belie, Nele ^{[1
]}

机构：

[1] Univ Ghent, Fac Engn & Architecture, Dept Struct Engn & Bldg Mat, Magnel Vandepitte Lab, Technologiepk Zwijnaarde 60, B-9052 Ghent, Belgium

[2] Katholieke Univ Leuven, Dept Civil Engn Mat & Construct, Ghent Technol Campus,Gebroeders De Smetstr 1, B-9000 Ghent, Belgium

来源：

CEMENT & CONCRETE COMPOSITES | 2023年 / 139卷

基金：

欧盟地平线“2020”;

关键词：

Self-healing concrete; Bacteria-based healing agent; Frost salt scaling; Chloride attack; Durability; FREEZE-THAW RESISTANCE; CRACK WIDTH CONTROL; SURFACE-TREATMENT; PORE STRUCTURE; MORTARS;

D O I：

10.1016/j.cemconcomp.2023.105016

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Self-healing concrete is an innovative and promising technology to increase the durability and service life of the structure by limiting the influence of aggressive attacks. However, knowledge on the performance in realistic conditions is limited. This paper presents the benefits of introducing a bacteria-based healing agent in concrete to enable self-healing, assessed under frost salt scaling conditions. Durability tests such as scaling, water perme-ability and chloride ingress were performed. In addition, a microstructural analysis was realized based on mercury intrusion porosimetry (MIP), fluorescence microscopy, thin section analysis, scanning electron micro-scopy (SEM) and energy-dispersive X-ray (EDX) spectroscopy. The bacteria enhanced the concrete properties, resulting in a 90% higher frost salt scaling resistance than the reference concrete and reduced chloride pene-tration by 46%. The bacteria-based concrete furthermore showed fewer microcracks. However, chloride pene-tration through cracks could not be prevented since only partial crack healing was achieved for the studied mix design.

引用

页数：14

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