Effectiveness and Mechanism of Fly Ash in Inhibiting Alkali-Silica Reaction of Sandstone


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The effectiveness of fly ash in suppressing expansion due to alkali-silica reaction (ASR) of sandstone are studied respectively based on accelerated mortar bar test and concrete prism test. The mechanism of fly ash in inhibiting the ASR of sandstone is examined by scanning electron microscope (SEM) and energy dispersive analysis of x-ray (EDAX). Moreover, the reliability of fly ash in inhibiting ASR of sandstone was discussed through concrete strength and frost resistance tests. Results indicate that the replacement amount of fly ash is 20%, the expansion due to ASR can be decreased to the critical value of a non-reactive aggregate. The reason why fly ash can inhibit the alkali reactivity for the sandstone is that the strong reaction between alkali and fly ash dissipates the alkali, and the products of alkali-silica-aluminate gels are non-expansible. For the concrete specimens suffered from accelerated ASR tests, their strength and frost resistance are decreased with the increment of fly ash replacement.



Advanced Materials Research (Volumes 250-253)

Edited by:

Guangfan Li, Yong Huang and Chaohe Chen




B. X. Li et al., "Effectiveness and Mechanism of Fly Ash in Inhibiting Alkali-Silica Reaction of Sandstone", Advanced Materials Research, Vols. 250-253, pp. 40-45, 2011

Online since:

May 2011




[1] M.D.A. Thomas, B.Q. Blackwell and K. Pettifer, in: Proceeding of the 9th International Conference on Alkali-Aggregate Reaction in Concrete, Vol. 2, Published by The Concrete Society, London, UK(1992), p.1059.

[2] M.D.A. Thomas: Magazine of Concrete Research Vol. 48(177) (1996), p.265.

[3] Li Beixing, Hu Xiaoman and Wen Ziyun: Engineering Journal of Wuhan University Vol. 39(1) (2006), p.67.

[4] DL/T 5151-2001: Test Code for Aggregates of Hydraulic Concrete (China Electric Power Press, Beijing 2002).

[5] Liu Chongxi, Wen Ziyun: Dam concrete Monograph (I): Alkali-Aggregate Reaction of concrete (South China University of Technology Press, Guangzhou 1995).

[6] R.F. Bleszynski, M.D.A. Thomas: Advanced Cement Based Materials, Vol. 7(2) (1998), p.66.