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Assessment of the ground aggregate paste (GAP) test for aggregate alkali–silica reactivity screening

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Abstract

This paper investigates the potential of a laboratory test for the screening of aggregate reactivity to alkali–silica reaction (ASR) through phase analysis of the phases developed in ground aggregate paste (GAP) specimens subjected to accelerated ageing. GAPs were prepared using two aggregates categorised as non-reactive and potentially reactive by standard expansion test methods and were aged at 40, 60 and 80 °C in 1 M NaOH solution over periods up to 84 days. Phase development was monitored using TG, XRD and FTIR, and the reactivity was correlated with quartz and calcium hydroxide consumption. The data demonstrate that this test has the potential to be developed as a screening test, based on the correlation of phase consumption with Australian standard expansion test reactivity categorisation.

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Acknowledgements

The authors would like to acknowledge UTS CareerHub, the Australian Research Council Research Hub for Nanoscience Based Construction Materials Manufacturing (NANOCOMM) and Cement, Concrete and Aggregates Australia (CCAA) for their support.

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  1. School of Mathematical and Physical Sciences, University of Technology Sydney, Ultimo, NSW, Australia

    Brendan Boyd-Weetman & Paul Thomas

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  1. Brendan Boyd-Weetman
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  2. Paul Thomas
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Correspondence to Paul Thomas.

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Boyd-Weetman, B., Thomas, P. Assessment of the ground aggregate paste (GAP) test for aggregate alkali–silica reactivity screening. J Therm Anal Calorim 142, 1635–1641 (2020). https://doi.org/10.1007/s10973-020-09768-8

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  • DOI: https://doi.org/10.1007/s10973-020-09768-8

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