Mitigating Alkali-Silica Reaction in Sustainable Concrete using Functionalized Clay Nanoparticles

J. Wei
University of Massachusetts, Lowell,
United States

Keywords: building materials, concrete, sustainable concrete

Summary:

When considering sustainability and service-life extension, it is critical to reduce the use of cement in concrete and ensure that the structural concrete has enough degradation resistance and can still safely perform its function even in the presence of potential degradation. Alkali-silica reaction (ASR) is one of the major degradation mechanisms of concrete causing irreparable volume expansion, cracking in both aggregates and the hydrated cement matrix and substantial damages in concrete structures and hence resulting in significant maintenance costs. While prior efforts have investigated ASR suppression, a cost-effective and robust ASR mitigating approach without the deleterious effect on cement hydration and concrete properties has remained the critical challenge for many years. The present work will focus on a fundamental understanding of ASR initiation and kinetics in concrete and an approach that can simultaneously suppress multiple prerequisites of ASR, while also improving the overall performance of concrete using high volume calcined clay nanoparticles.