Shrinkage of Nanomodified Fly Ash Concrete as Repair Material


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Title: Shrinkage of Nanomodified Fly Ash Concrete as Repair Material

Author(s): A. Ghazy and M. T. Bassuoni

Publication: Materials Journal

Volume: 114

Issue: 6

Appears on pages(s): 877-888

Keywords: curing; fly ash; nanosilica; repair; shrinkage

Date: 11/1/2017

The overall performance of cementitious repair systems depends greatly on the compatibility between the repair materials and existing concrete, which is a major issue for many rapid-setting repair materials for concrete pavements. Current state-of-the-art research on the use of nanoparticles in concrete, including repair applications, is growing due to its promising potential. However, with the advent of nanomaterials in concrete, it is imperative to understand its shrinkage behavior due to the very rapid hydration and pozzolanic reactions at early age, which warrants a focused investigation. Thus, in the present study, a series of volume stability (shrinkage) tests were conducted to evaluate the performance of nanomodified fly ash concrete as a repair material for concrete pavements. The results indicate that, despite their higher autogenous shrinkage, most nanomodified fly ash concrete mixtures exhibited low total shrinkage (free and restrained) when adequate curing was provided.