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

Jefferson, Anthony Duncan, Joseph, C., Lark, Robert John, Isaacs, B., Dunn, S. C. and Weager, B. 2010. A new system for crack closure in cementitious materials using shrinkable polymers. Cement and Concrete Research 40 (5) , pp. 795-801. 10.1016/j.cemconres.2010.01.004

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Abstract

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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TH Building construction
Uncontrolled Keywords: Long-term performance; Durability; Shape Memory Polymer; Crack–healing
Publisher: Elsevier
ISSN: 1873-3948
Last Modified: 04 Jun 2017 02:03
URI: http://orca.cf.ac.uk/id/eprint/8266

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