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A new system for crack closure of cementitious materials using shrinkable polymers / Anthony Jefferson in Cement and concrete research, Vol. 40 N° 5 (Mai 2010) 

Public ISBD [article]  in Cement and concrete research > Vol. 40 N° 5 (Mai 2010) . - pp. 795–801 Titre : A new system for crack closure of cementitious materials using shrinkable polymers Type de document : texte imprimé Auteurs : Anthony Jefferson, Auteur Année de publication : 2012 Article en page(s) : pp. 795–801 Note générale : Bibliogr. Langues : Anglais (eng) Mots-clés : Long-term  performance;  Durability;  Shape  Memory  Polymer;Crack–healing Résumé : 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. En ligne : http://www.sciencedirect.com/science/article/pii/S0008884610000062 [article] A new system for crack closure of cementitious materials using shrinkable polymers [texte imprimé] / Anthony Jefferson, Auteur . - 2012 . - pp. 795–801. Bibliogr. Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 5 (Mai 2010) . - pp. 795–801 Mots-clés : Long-term  performance;  Durability;  Shape  Memory  Polymer;Crack–healing Résumé : 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. En ligne : http://www.sciencedirect.com/science/article/pii/S0008884610000062