Influence of Fly Ash as Cement Replacement on the Properties of Recycled Aggregate Concrete
Publication: Journal of Materials in Civil Engineering
Volume 19, Issue 9
Abstract
The use of high percentages of recycled aggregates in concrete would usually worsen the concrete properties. This paper tries to address the deficiency of the use of recycled aggregates by systematically presenting results on the influence of incorporating Class F fly ash on concrete properties. In this study, two series of concrete mixtures were prepared with water-to-binder (W/B) ratios of 0.45 and 0.55. The recycled aggregate was used as 0, 20, 50, and 100% by weight replacements of natural aggregate. In addition, fly ash was used as 0, 25, and 35% by weight replacements of cement. The results showed that the compressive strengths, tensile strengths, and static modulus of elasticity values of the concrete at all ages decreased as the recycled aggregate and the fly ash contents increased. Further, an increase in the recycled aggregate content decreased the resistance to chloride ion penetration and increased the drying shrinkage and creep of concrete. Nevertheless, the use of fly ash as a substitute for cement improved the resistance to chloride ion penetration and decreased the drying shrinkage and creep of the recycled aggregate concrete. The results showed that one of the practical ways to utilize a high percentage of recycled aggregate in structural concrete is by incorporating 25–35% of fly ash as some of the drawbacks induced by the use of recycled aggregates in concrete could be minimized.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The writers would like to thank the Environment and Conservation Fund, the Woo Wheelock Green Fund and the Hong Kong Polytechnic University for funding support.
References
Abou-Zeid, M. N., Shenouda, M. N., McCabe, S., and El-Tawil, F. A. (2005). “Reincarnation of concrete.” Concr. Int., 27(2), 53–59.
ASTM. (1997). “Standard test method for electrical indication of concrete’s ability to resist chloride ion penetration.” ASTM C 1202, Philadelphia.
ASTM. (2002a). “Standard test method for creep of concrete in compression.” ASTM C 512, Philadelphia.
ASTM. (2002b). “Standard test method for static modulus of elasticity and Poisson’s ratio of concrete in compression.” ASTM C 469, Philadelphia.
Atis, C. D., Kilic, A., and Sevim, U. K. (2004). “Strength and shrinkage properties of mortar containing a nonstandard high-calcium fly ash.” Cem. Concr. Res., 34(1), 99–102.
British Standards Institution (BSI). (1970). “Methods of testing concrete for other than strength.” BS 1881 Part 5, London.
British Standards Institution (BSI). (1985). “Specification for aggregates from natural sources for concrete.” BS 882, London.
Cho, Y. H., and Yeo, S. H. (2004). “Application of recycled waste aggregate to lean concrete subbase in highway pavement.” Can. J. Civ. Eng., 31(6), 1101–1108.
Dhir, R. K., Limbachiya, M. C., and Leelawat, T. (1999). “Suitability of recycled concrete aggregate for use in BS 5328 designated mixes.” Proc. Inst. Civ. Eng., Struct. Build., 134(4), 257–274.
Dhir, R. K., Munday, J. G. L., and Ong, L. T. (1986). “Investigations of the engineering properties of OPC/pulverized-fuel ash concrete: Deformation properties.” Struct. Eng., 64B(2), 36–42.
Gomez-Soberon, J. M. V. (2003). “Relationship between gas absorption and the shrinkage and creep of recycled aggregate concrete.” J. Cem., Concr., Aggregates (ASTM), 25(2), 42–48.
Leng, F., Feng, N., and Lu, X. (2000). “An experimental study on the properties of resistance to diffusion of chloride ions of fly ash and blast furnace slag concrete.” Cem. Concr. Res., 30(6), 989–992.
Mindess, S., Young, J. F., and Darwin, D. (2003). Concrete, 2nd Ed., Prentice-Hall, Upper Saddle River, N.J.
Nehdi, M., Pardlan, M., and Koshowski, S. (2004). “Durability of self-consolidating concrete incorporating high-volume replacement composite cements.” Cem. Concr. Res., 34(11), 2103–2112.
Neville, A. M. (1995). Properties of concrete, 4th Ed., Longman Group, Harlow.
Olorunsogo, F. T., and Padayachee, N. (2002). “Performance of recycled aggregate concrete monitored by durability indexes.” Cem. Concr. Res., 32(2), 179–185.
Otsuki, N., Miyazat, S., and Yodsudjai, W. (2003). “Influence of recycled aggregate on interfacial transition zone, strength, chloride penetration, and carbonation of concrete.” J. Mater. Civ. Eng., 15(5), 443–451.
Poon, C. S., Shui, Z. H., Lam, L., and Kou, S. C. (2004). “Influence of moisture states of natural and recycled aggregates on the slump and compressive strength of hardened concrete.” Cem. Concr. Res., 34(1), 31–36.
Salem, R. M., Burdette, E. G., and Jackson, N. M. (2003). “Resistance to freezing and thawing of recycled aggregate concrete.” ACI Mater. J., 100(3), 216–221.
Tam, V. W. Y., Gao, X. F., and Tam, C. M. (2005). “Microstructural analysis of recycled aggregate produced from two-stage mixing approach.” Cem. Concr. Res., 35(6), 1195–1203.
Tavakoli, M., and Soroushian, P. (1996). “Drying shrinkage behavior of recycled aggregate concrete.” Concr. Int., 18(11), 58–61.
Information & Authors
Information
Published In
Copyright
© 2007 ASCE.
History
Received: May 23, 2005
Accepted: Mar 19, 2007
Published online: Sep 1, 2007
Published in print: Sep 2007
Notes
Note. Associate Editor: Shin-Che Huang
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.