Cure shrinkage in epoxy grouts for grouted repairs

Md. Shamsuddoha; Md. Mainul Islam; Thiru Aravinthan; Allan Manalo; Kin-tak Lau

doi:10.1117/12.2028085

14 August 2013 Cure shrinkage in epoxy grouts for grouted repairs

Md. Shamsuddoha, Md. Mainul Islam, Thiru Aravinthan, Allan Manalo, Kin-tak Lau

Proceedings Volume 8793, Fourth International Conference on Smart Materials and Nanotechnology in Engineering; 87931J (2013) https://doi.org/10.1117/12.2028085
Event: Fourth International Conference on Smart Materials and Nanotechnology in Engineering, 2013, Gold Coast, Australia

Abstract

Structures can go through harsh environmental adversity and can experience material loss and cracks during their service lives. Infill material is used to ensure a supporting bed for a grouted repair. Epoxy grouts are used for repairing and rehabilitating structures, such as foundations, bridges, piers, transportation pipelines, etc., because they are resistant to typical chemicals and possess superior mechanical properties than other grouts. The resin based infill used inside the void or cracked space of the repair is vulnerable to shrinkage. When these filled grouts have high resin content, cracks can develop from residual stresses, which can affect the load transfer performance. It follows that interlayer separation and cracking of infill layer can occur in a grouted repair. In this study, volumetric shrinkage of two epoxy grouts was measured over 28 days using a Pycnometer. The highest volumetric shrinkage measured after 7 days was found to be 2.72%. The results suggest that the volumetric shrinkage can be reduced to 1.1% after 7 days, through the introduction of a coarse aggregate filler; a 2.5 times reduction in shrinkage. About 98% and 92% of the total shrinkage over the 28 day period, of the unfilled and filled grouts respectively, was found to occur within 7 days of mixing. The gel-time shrinkages were also calculated, to determine the “postgel” part of the curing contraction which subsequently produces residual stresses in the hardened grout systems.

Citation Download Citation

Md. Shamsuddoha, Md. Mainul Islam, Thiru Aravinthan, Allan Manalo, and Kin-tak Lau "Cure shrinkage in epoxy grouts for grouted repairs", Proc. SPIE 8793, Fourth International Conference on Smart Materials and Nanotechnology in Engineering, 87931J (14 August 2013); https://doi.org/10.1117/12.2028085

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