Effects of Moderate Calcium Oxide Fly Ash on Expansion of Mortar Bar Due to Thai Local Reactive Aggregates

Authors

  • Chakkarphan Sangsuwan Kasetsart University
  • Suvimol Sujjavanich Kasetsart University

DOI:

https://doi.org/10.4186/ej.2012.16.3.101

Keywords:

ASR, expansion, fly ash, greywacke.

Abstract

This paper reports the effect of local pozzolan on expansion of mortar bar due to local potential reactivity aggregates. The study, based on the accelerated test method, investigated capability of moderate calcium oxide fly ash to control the length change due to chemical reaction between some certain aggregates and alkalis in cement. Since the finding of ASR evidence in Thailand, this information has been essential for possible mitigation approach. Percentage variation of lignite fly ash from 20 to 50 yielded different benefits on expansion control. The highest percentage replacement showed the best result in reducing expansion from 0.17% to 0.03% and from 0.43% to 0.07% at 16 and 30 days after casting, respectively. The findings provided background information that would affect aggregate screening process adopted in the country and the potential mitigating method for local potential reactive aggregate, of greywacke lithology.

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Author Biographies

Chakkarphan Sangsuwan

Kasetsart University, 50 Paholyothin, Jatuchak 10900, Thailand

Suvimol Sujjavanich

Kasetsart University, 50 Paholyothin, Jatuchak 10900, Thailand

Published

Vol 16 No 3, Feb 29, 2012

How to Cite

[1]
C. Sangsuwan and S. Sujjavanich, “Effects of Moderate Calcium Oxide Fly Ash on Expansion of Mortar Bar Due to Thai Local Reactive Aggregates”, Eng. J., vol. 16, no. 3, pp. 101-108, Feb. 2012.