The Effectiveness of High Quality Supplementary Cementitious Materials for Mitigating ASR Expansion in Concrete with High Alkali Content
Abstract
Alkali silica reaction (ASR) is influenced by external factors such as the surrounding environment of high alkalinity. Countries with cold climate have a high probability to be exposed to high concentrations of NaCl solution by the deicing salt. This condition will lead to serious ASR problems in concrete, if the aggregates contain reactive silica. The main research work in this paper is to investigate the effect of 15% replacement ratio of high quality fine fly ash (FA15%) and 42% replacement ratio of blast furnace slag (BFS42%) on the ASR mitigation in concrete with different alkali amount inside the pore solution. The experiments were conducted according to the accelerated mortar bars experiment following the JIS A1146 mortar bar test method. In addition, post-analysis such as observation of ASR gel formation by the Uranyl Acetate Fluorescence Method and observation of thin sections using a Polarizing Microscope were also conducted. The mortar bar tests show a very good mitigation effect of supplementary cementitious materials (SCMs). The results show that only small ASR expansions, which can be categorized as “innocuous”, occurred for specimens with 1.2% Na2Oeq using FA15% and BFS42%. However, larger alkali amount inside the system will require more SCMs amount.
Keywords:
ASR expansion, alkali content, SCMsDownloads
References
T. Habuchi, N. Miyasaka, H. Tsuji, K. Torii, “Evaluation of combined deterioration of concrete structures in marine environment due to alkali-silica reaction and seawater attack”, 4th International Conference on Concrete under Severe Conditions, Vol. 2, pp. 2026-2033, 2004
P. R. Vassie, “A secondary of ASR on bridges-corrosion of reinforcement steel”, 2nd International Conference on Bridge Management, pp. 18-21, 1993
K. Torii, “The Characteristic Feature of Fracture of Steel Reinforcement in ASR-Deteriorated Concrete Structures”, Corrosion Engineering, Vol. 59, No. 4, pp. 59-65, 2010 DOI: https://doi.org/10.3323/jcorr.59.117
Japan Society of Materials Science, “Report on the development of pre-stressed concrete structures using high durability powder blast furnace slag”, 1998 (in Japanese).
K. Torii, “High durability of concrete through the use of fly ash- Approach and information dissemination to ASR problem of Hokuriku region”, Civil Engineering in Electric Power, No. 357, pp. 11-15, 2012 (in Japanese).
M. D. A. Thomas, B. Q. Blackwell, P. J. Nixon, “Estimating the alkali contribution from fly ash to expansion due to the alkali-aggregate reaction in concrete”, Magazine of Concrete Research, Vol. 48, No. 177, pp. 251–264, 1996 DOI: https://doi.org/10.1680/macr.1996.48.177.251
M. D. A. Thomas, B. Q. Blackwell, “Summary of BRE research on the use of fly ash to suppress AAR expansion”, 10th International Conference on Alkali-Aggregate Reaction in Concrete, pp. 554–61, 1996
R. L. Hooper, J. D. Matthews, P. J. Nixon, M. D. A. Thomas, “The introduction of BS EN450 fly ash and mitigating the risk of ASR in the U.K.”, 10th International Conference on Alkali-Aggregate Reaction in Concrete, Vol. 1, pp. 544–53, 2004
T. Hashimoto, K. Torii, “The development of highly durable concrete using classified fine fly ash in Hokuriku district”, Journal of Advanced Concrete Technology, Vol. 11, pp. 312-321, 2013 DOI: https://doi.org/10.3151/jact.11.312
C. Sannoh, T. Hashimoto, K. Torii, “The suppressing effect of fly ash on asr under outdoor exposure conditions at the seashore”, 3rd International Conference on Sustainable Construction Materials and Technologies, Kyoto, Japan, August 18–21, 2013
T. Kanda, H. Momose, K. Yoda, A. Shintani, “Experimental investigation for improving shrinkage cracking resistance of BFS blended cement concrete exposed to hot environment”, 3rd International Conference on Sustainable Construction Materials and Technologies, Kyoto, Japan, August 18-21, 2013
Japan Concrete Institute., “Report of research committee and diagnostic suppression of alkali-aggregate reaction considering the mechanism of action”, pp. 68-81, 2008 (in Japanese).
T. Katayama, M. Tagami, Y. Sarai, S. Izumi, T. Hira, “Alkali-aggregate reaction under the influence of deicing salts in the Hokuriku district, Japan”, Materials Characterization, Vol. 53, No. 2-4, pp. 105-122, 2004 DOI: https://doi.org/10.1016/j.matchar.2004.07.003
T. Katayama, T. Oshiro, Y. Sarai, K. Zaha, T. Yamato, “Late-expansive ASR due to imported sand and local aggregates in Okinawa Island, South western Japan”, 13th International Conference on Alkali-Aggregate Reaction in Concrete, pp. 862-873, 2008
M. D. A. Thomas, B. Fournier, K. Folliard, J. Ideker, M. Shehata, “Test methods for evaluating preventive measures for controlling expansion due to alkali-silica reaction in concrete”, Cement and Concrete Research, Vol. 36, No. 10, pp. 1842–1856, 2006 DOI: https://doi.org/10.1016/j.cemconres.2006.01.014
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