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Influence of Redispersible Polymer Type and Content on Restrained Shrinkage Cracking in Non-Structural Concrete Patch Repair Mortars

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Abstract:

This paper investigates the influence of two proprietary redispersible polymers, i.e. Ethylene Vinyl Acetate (EVA) and Styrene Acrylate (SA) - at varying contents of 10%, 15% and 20% by mass of cement - on cracking and crack-determining material properties in non-structural concrete patch repair mortars. Five mortar mixes, one control mix and four polymer-modified mixes, were designed, developed and tested under a controlled laboratory environment. The effects of polymer type and content on macroporosity, the age at cracking and crack widths in restrained shrinkage specimens, compressive strength, direct tensile strength, elastic modulus, drying shrinkage and tensile relaxation were investigated. From the test results, it was observed that polymer type and content influence cracking and crack-determining material properties significantly. An increase in polymer content resulted in a significant reduction in elastic modulus, crack widths, compressive and direct tensile strength. An increase in polymer content also resulted in a significant increase in drying shrinkage, tensile relaxation and the age at cracking. The performance of EVA polymers, with respect to the susceptibility to cracking, was better than that of SA polymers at constant polymer content. Overall, the addition of polymers improved the cracking performance of the non-structural concrete patch repair mortars under investigation significantly, highlighting their potential for use in practice to improve the durability of non-structural concrete patch repairs.

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Periodical:

Materials Science Forum (Volume 1161)

Pages:

123-136

DOI:

https://doi.org/10.4028/p-lUEX8M

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Online since:

October 2025

Authors:

Philemon Abuti Arito*

Keywords:

Cracking, Patch Repair Mortar, Polymer Content, Polymer Type, Redispersible Polymers, Restrained Shrinkage

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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