Title:
Carbonation of Mortar with Alkali-Silica Reactions
Author(s):
Chun-Tao Chen, Wei-Cheng Yang, and Chin-Wei Hsu
Publication:
Symposium Paper
Volume:
326
Issue:
Appears on pages(s):
81.1-81.6
Keywords:
alkali-silica reaction (ASR); carbonation; expansion; limestone addition; durability; mortar
DOI:
10.14359/51711064
Date:
8/10/2018
Abstract:
This study explores the composite deteriorations between the alkali-silica reaction (ASR) and the carbonation. During the study, mortar specimens were prepared using Pyrex glass at two water-cement ratios of 0.47 and 0.6 and cured in air at the temperature of 23 °C and relative humidity of 50% for one day. To accelerate the ASR, the specimens were subjected to the 80°C NaOH solution, and the length changes were measured daily. To accelerate the carbonation, the specimens were oven-dried for one day and then subjected to 50% CO2 at the relative humidity of 70%. Results showed that the carbonation before the ASR mitigated the expansion because of the reduced alkalis in the specimens. When the accelerated carbonation was applied to the specimen after its initiation of ASR, the carbonation time to inhibit the expansion was increased. The cycling ASR and carbonation showed apparent inhibition of expansion even though the carbonation time was short.
Related References:
1. Stanton, T. E., “Influence of Cement and Aggregate on Concrete Expansion,” Engineering News-Record, V. 124, 1940, pp.59-61.
2. Gillott, J. E., “Alkali-Aggregate Reaction in Concrete,” Engineering Geology, V. 9, No. 4, 1975, pp.303-326.
3. Fernadez-Jimenez, A. and Puertas, F., “The Alkali-Silica Reaction in Alkali-Activated Granulated Slag Mortars with Reactive Aggregate,” Cement and Concrete Research, V. 32, No. 7, 2002, pp.1019-1024.
4. Shehata, M. H. and Thomas, M. D. A., “The Effect of Fly Ash Composition on the Expansion of Concrete Due to Alkali-Silica Reaction,” Cement and Concrete Research, V. 30, No. 7, 2000, pp.1063-1072.
5. Shon, C. S., Sarkar, S. L. and Zollinger, D. G., “Testing the Effectiveness of Class C and Class F Fly Ash in Controlling Expansion Due to Alkali-Silica Reaction Using Modified ASTM C 1260 Test Method,” Journal of Materials in Civil Engineering, V. 16, No. 1, 2004, pp.20-27.
6. Boddy, A. M., Hooton, R. D. and Thomas, D. A., “The Effect of Product Form of Silica Fume on Its Ability to Control Alkali-Silica Reaction,” Cement and Concrete Research, V.30, No. 7, 2000, pp.1139-1150.
7. McCoy, W. J., Caldwell, A.G., “New Approach to Inhibiting Alkali-Aggregate Expansion,” Journal of the American Concrete Institute, V.22, No. 5, 1951, pp.693-706.
8. Lawrence, M., and Vivian, H. E., “The Reactions of Various Alkalis with Silica,” Australian Journal of Applied Science, V. 12, No 1, 1961, pp.96-103.
9. Diamond, S. and Ong, S., “The Mechanisms of Lithium Effects on ASR,” Proceeding of the 9th International Conference on Alkali-Aggregate Reaction in Concrete, The Concrete Society, London, 1992, pp. 269-278.
10. Bonavetti, V., Donza, H., Menendez, G., Cabrera, O. and Irassar, E. F., “Limestone Filler Cement in Low w/c Concrete: A Rational Use of Energy,” Cement and Concrete Research, V. 33, No. 6, 2003, pp.865-871.
11. Neville, A. M., “Properties of Concrete,” 3rd Edition, Prentice Hall, Upper Saddle River, NJ, 1981.
12. Papadakis, V. G., Vayenas, C. G. and Fardis, M. N., “A Reaction Engineering Approach to the Problem of Concrete Carbonation,” AIChE Journal, V. 35, No. 10, 1989, pp.1639-1650.