Chloride Diffusion Coefficient of Reclycled Aggregate Concrete Containing Fly Ash under 3-Year Exposure in Marine Environment
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Abstract
This research studied the chloride diffusion coefficient of recycled concrete aggregate containing fly ash exposed to marine environment for 3 years. Mae-Moh fly ash was used to replace portland cement at the percentages of 0, 15, 25, 35, and 50 by the weight of binder with water to binder (W/B) ratios of 0.40, 0.45, and 0.50 in the mixtures. The concrete cube specimens of 200×200×200 mm3 were cast and placed in the tidal zone of marine environment for 3 years. Chloride diffusion coefficients of the specimens were determined according to Fick’s second law of diffusion. The research revealed that chloride diffusion coefficients of recycled concrete aggregate containing fly ash were significantly lower than those of recycled concrete aggregate without any fly ash. Smaller in W/B ratio also lessened the chloride penetration coefficient especially in recycled concrete aggregate with no fly ash than those of concrete aggregate containing fly ash. Considering ACI 201.2R recommendation, the use of Mae-Moh fly ash to replace Portland cement between 15 and 25 percent by weight of binder with the W/B ratio of 0.40 in the mixture would be suggested to satisfy both compressive strength and chloride penetration resistance of recycled concrete aggregate exposed to marine environment due to the suitable compressive strength and the ability to resist chloride diffusion.
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References
[2] M. C. Limbachiya, T. Leelawat, and R. K. Dhir, “Use of recycled concrete aggregate in highstrength concrete,” Materials and Structure, vol. 33, pp. 574–580, November 2000.
[3] R. Somna, C. Jaturapitakkul, P. Rattanachu, and W. Chalee, “Effect of ground bagasse ash on mechanical and durability properties of recycled aggregate concrete,” Materials and Design, vol. 36, pp. 597–603, April 2012.
[4] W. Chalee, P. Ausapanit, and C. Jaturapitakkul, “Utilization of fly ash concrete in marine environment for long term design life analysis,” Materials and Design, vol. 31, no. 3, pp. 1242–1249, March 2010.
[5] W. Chalee, T. Sasakul, P. Suwanmaneechot, and C. Jaturapitakkul, “Utilization of rice husk-bark ash to improve the corrosion resistance of concrete under 5-year exposure in a marine environment,” Cement and concrete composites, vol. 37, pp. 47–53, March 2013.
[6] W. Chalee and C. Jaturapitakkul, “Relation between Water Permeability and Chloride Diffusion Coefficient of Concrete Exposure in Marine Environment,” Annual Concrete Conference, vol. 51, no. 5, pp. 959–974, 2011 (in Thai).
[7] W. Chalee, C. Jaturapitakkul, and P. Chindaprasirt, “Predicting the chloride penetration of fly ash concrete in seawater,” Marine Structures, vol. 22, no. 3, pp. 341–353, July 2009.
[8] S. Rukzon and P. Chindaprasirt, “Strength and chloride resistance of blended Portland cement mortar containing palm oil fuel ash and fly ash,” International Journal of Minerals, Metallurgy and Materials, vol. 16, no. 4, pp. 475–481, August 2009.
[9] J. Tangpagasit, R. Cheerarot, C. Jaturapitakkul, and K. Kiattikomol, “Packing effect and pozzolanic reaction of fly ash in mortar,” Cement and Concrete Research, vol. 35, no. 6, pp. 1145–1151, June 2005.
[10] Standard specification for coal fly ash and raw or calcined natural pozzolan for use in concrete, ASTM C 618-03, 2003.
[11] Standard test method for acid-soluble chloride in mortar and concrete, ASTM C 1152, 2008.
[12] J. Crank, The Mathematic of Diffusion, Oxford Press, London, 2nd, edn., 1975.
[13] P. Sravana, P. Sarika, S. Rao, S. Sekhar, and G. Apparao, “Studies on relationship between water/binder ratio and compressive strength of high volume fly ash concrete,” AJER American Journal of Engineering Research, vol. 2, no. 8, pp. 115–122, 2013.
[14] K. Rahmani, A. Shamsai, B. Saghafian, and S. Peroti, “Effect of water and cement ratio on compressive strength and abrasion of microsilica concrete,” Middle-East Journal of Scientific Research, vol. 12, no. 8, pp. 1056–1061, 2012.
[15] R. Somna, C. Jaturapitakkul, W. Chalee, and P. Rattanachu, “Effect of W/B ratio and ground fly ash on properties of recycled aggregate,” ASCE’s Journal of Materials in Civil Engineering, vol. 24, no. 1, pp. 16–22, January 2012.
[16] P. Suwanmaneechot and W. Chalee, “Chloride penetration and steel corrosion in portland cement type V concrete containing fly ash from fluidized-bed and pulverized combustions under marine exposure,” Journal of King Mongkut’s University of Technology North Bangkok, vol. 22, no. 3, pp. 1–13, 2012 (in Thai).
[17] R. Somna, W. Chalee, and C. Jaturapitakkul, “Influence of classified fly ashes from 5-Source on compressive strength of mortar and sulfuric acid attack on concrete,” Annual Concrete Conference, vol. 2, pp. 107–112, 2008 (in Thai).
[18] J. Tangpagasit, R. Cheerarot, C. Jaturapitakkul, and K. Kiattikomol, “Packing effect and pozzolanic reaction of fly ash in mortar,” Cement and Concrete Research, vol. 35, no. 6, pp. 1145–1151, June 2005.
[19] K. Charoenprom and W. Chalee, “Relation between water permeability and chloride diffusion coefficient of concrete under 10-year exposure in marine environment,” Journal of King Mongkut’s University of Technology North Bangkok, vol. 23, no. 1, pp. 29–41, 2013 (in Thai).
[20] W. Chalee and C. Jaturapitakkul, “Effect of W/B ratios and fly ash finenesses on chloride diffusion coefficient of concrete in marine environment,” Materials and Structures, vol. 42, no. 4, pp. 505–515, May 2009.
[21] W. Chalee, C. Jaturapitakkul, and P. Chindaprasirt, “Predicting the chloride penetration of fly ash concrete in seawater,” Marine Structures, vol. 22, no. 3, pp. 341–353, July 2009.
[22] Guide to durable concrete, American Concrete Institute ACI Committee 201.2R-01, 2003.