A new system for crack closure of cementitious materials using shrinkable polymers

被引：85

作者：

Jefferson, Anthony ^{[1
]}

Joseph, Christopher ^{[1
]}

Lark, Robert ^{[1
]}

Isaacs, Ben ^{[1
]}

Dunn, Simon ^{[1
]}

Weager, Brendon ^{[2
]}

机构：

[1] Cardiff Univ, Cardiff Sch Engn, Cardiff CF24 3AA, S Glam, Wales

[2] NetComposites, Chesterfield S41 9QG, England

来源：

CEMENT AND CONCRETE RESEARCH | 2010年 / 40卷 / 05期

关键词：

Long-term performance; Durability; Shape Memory Polymer; Crack-healing; STRESS;

D O I：

10.1016/j.cemconres.2010.01.004

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This paper presents details of an original crack-closure system for cementitious materials using shrinkable polymer tendons. The system involves the incorporation of unbonded pre-oriented polymer tendons in cementitious beams. Crack closure is achieved by thermally activating the shrinkage mechanism of the restrained polymer tendons after the cement-based material has undergone initial curing. The feasibility of the system is demonstrated in a series of small scale experiments on pre-cracked prismatic mortar specimens. The results from these tests show that, upon activation, the polymer tendon completely closes the preformed macro-cracks and imparts a significant stress across the crack faces. The potential of the system to enhance the natural autogenous crack healing process and generally improve the durability of concrete structures is addressed. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：795 / 801

页数：7

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