Evaluation of early age cracking in rendering mortars with polypropylene fibers

Autores

Palavras-chave:

rendering mortar, polypropylene fiber, cracking, mechanical strength, ring test

Resumo

The incorporation of fibers in concrete produces an improvement in the characteristics of the material as observed in different studies. In order to obtain the same good results, fibers are added to rendering mortars to reduce some of their drawbacks. However, this type of mortar has some specific characteristics, such as hydrated-lime utilization or higher air, which is not usual in concrete. Thus, this study aims to evaluate the potential of polypropylene fibers to reduce early age cracking caused by restrained shrinkage in rendering mortars. Two types of mortars were used to verify possible differences in the way they responded to the introduction of fiber. The influence of the fiber content was also investigated. Mortars were evaluated in fresh state, and mechanical behaviors were measured at several ages. The restrained shrinkage cracking was followed for 21 days using the ring test method. The use of polypropylene fibers leads a smaller value of total crack width and a delay of the first crack. Also, the elastic modulus shows a higher correlation with the mortars crack width. Both parameters were successfully used to predict the mortars crack width. The ring test method may be a suitable test method to evaluate the capacity of fibers to control the crack formation in rendering mortars.

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Biografia do Autor

Renata Monte, Department of Civil Engineer, Escola Politécnica - USP

PhD from Escola Politécnica-USP in 2015. Research interests are fiber reinforced concrete, concrete quality control, admixtures for concrete and rendering mortars.

Department of Civil Engineer, Escola Politécnica - USP

Mercia Maria Semensato Bottura Barros, Department of Civil Engineer, Escola Politécnica - USP

Civil enginner and lector Professor at University of São Paulo. Received BS in Civil Enginner from UFSCAR in 1985 and PhD from Escola Politécnica-USP in 1996. 

Department of Civil Engineer, Escola Politécnica - USP

Antonio Domingues de Figueiredo, Department of Civil Engineer, Escola Politécnica - USP

Associated Professor at University of São Paulo. Received BS in Civil Enginner from Escola Politécnica of USP in 1987 and his PhD from the same institution in 1997.

Department of Civil Engineer, Escola Politécnica - USP

Publicado

06.06.2018

Como Citar

MONTE, R.; BARROS, M. M. S. B.; FIGUEIREDO, A. D. de. Evaluation of early age cracking in rendering mortars with polypropylene fibers. Ambiente Construído, [S. l.], v. 18, n. 2, p. 21–32, 2018. Disponível em: https://seer.ufrgs.br/index.php/ambienteconstruido/article/view/72657. Acesso em: 28 mar. 2024.