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Stability and bond properties of polymer-modified self-consolidating concrete for repair applications

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ABSTRACT

Latexes including polyvinyl acetate (PVA) and styrene-butadiene rubber (SBR) are widely used to improve adhesion and bond properties of cementitious-based repair materials. The main objective of this paper is to evaluate the effect of such polymers on stability of highly flowable self-consolidating concrete (SCC) during placement and until onset of hardening. Also, the bond properties to existing concrete substrate and steel bars are investigated. Two series of mixtures prepared with relatively low to high water-to-binder ratio and incorporating 5–15 % polymers were tested. Special emphasis was placed to highlight the altered stability responses including flowability, viscosity, passing ability, and segregation resistance with respect to the European Guidelines for SCC. Remarkable improvements in the concrete-bar bond stresses were noticed with PVA and SBR additions. This was attributed to improved concrete elasticity and tensile splitting strength that increased contribution of material bearing strength around the steel bars.

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Acknowledgments

This project was funded by the School of Engineering Research Council of the Lebanese American University (LAU), Byblos, Lebanon. The authors wish to acknowledge the experimental support provided by Finders Technical Services, Amchit, as well as Laboratory of the Civil Engineering Department at LAU including the contributions of undergraduate research assistants Hratch Agopian and Yorguo El-Hachem.

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Authors and Affiliations

  1. Department of Civil Engineering, Lebanese American University, Byblos, Lebanon

    Camille A. Issa

  2. Holderchem Building Chemicals, Amchit, Lebanon

    Joseph J. Assaad

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  1. Camille A. Issa
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  2. Joseph J. Assaad
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Correspondence to Joseph J. Assaad.

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Issa, C.A., Assaad, J.J. Stability and bond properties of polymer-modified self-consolidating concrete for repair applications. Mater Struct 50, 28 (2017). https://doi.org/10.1617/s11527-016-0921-6

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