Cross-linkable polyethers as healing/sealing agents for self-healing of cementitious materials

被引：44

作者：

Araujo, Maria ^{[1
,2
,3
]}

Van Vlierberghe, Sandra ^{[2
]}

Feiteira, Joao ^{[1
]}

Graulus, Geert-Jan ^{[2
]}

Van Tittelboom, Kim ^{[1
]}

Martins, Jose C. ^{[4
]}

Dubruel, Peter ^{[2
]}

De Belie, Nele ^{[1
]}

机构：

[1] Univ Ghent, Fac Engn & Architecture, Dept Struct Engn, Magnel Lab Concrete Res, Technol Pk Zwijnaarde 904, B-9052 Ghent, Belgium

[2] Univ Ghent, Fac Sci, Dept Organ & Macromol Chem, Polymer Chem & Biomat Grp, Campus De Sterre,Bldg S4,Krijgslaan 281, B-9000 Ghent, Belgium

[3] SIM Vzw, Technol Pk Zwijnaarde 935, B-9052 Ghent, Belgium

[4] Univ Ghent, Fac Sci, Dept Organ & Macromol Chem, NMR & Struct Anal Unit, Campus De Sterre,Bldg S4,Krijgslaan 281, B-9000 Ghent, Belgium

来源：

MATERIALS & DESIGN | 2016年 / 98卷

关键词：

Self-healing; Concrete; Hydrogel precursor; Michael type addition reaction; In-situ curable hydrogels; ADDITION-REACTIONS; POLYURETHANE; HYDROGELS; CONCRETE; ACRYLATE; EFFICIENCY; COMPOSITE; DESIGN;

D O I：

10.1016/j.matdes.2016.03.005

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

To date, the potential of several types of polymeric materials as healing agents for self-healing of concrete has already been investigated. Generally, for self-healing concrete with encapsulated polymeric healing agents, the curing mechanism is triggered upon contact with moisture/air or upon reaction with a second component provided by additional capsules. The present work explores the use of in-situ curable hydrogels formed as a result of the elevated pH of the cementitious matrix, via a Michael-type addition reaction, as potential healing/sealing materials for concrete applications. For this purpose, a variety of acrylate-endcapped urethane-based precursors were synthesized and combined with a thiol-based cross-linker. Various properties including the viscosity, the curing time, the swelling capacity and the cross-linking efficiency have been evaluated. The potential of the developed materials to seal concrete cracks was assessed through manual injection. The results indicate that the cross-linking reaction can readily occur in-situ due to the alkaline environment of the cementitious matrix and that the hydrogels exhibit favorable sealing properties. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：215 / 222

页数：8

共 37 条

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