Behavior of FRP-Confined Compound Concrete Containing Recycled Concrete Lumps
Publication: Journal of Composites for Construction
Volume 20, Issue 1
Abstract
A recently proposed technique for the recycling of concrete is to directly reuse large pieces of coarsely crushed demolition concrete (referred to as recycled concrete lumps or RCLs) with fresh concrete in new construction. This novel recycling process is simpler and more cost-effective than the traditional way of recycling concrete as aggregates. The resulting concrete, referred to as compound concrete in this paper, features greater heterogeneity, especially when the fresh and the recycled concretes have rather different strengths. The interfaces between RCLs and fresh concrete, as internal weaknesses, may also compromise the performance of the compound concrete. One possibility to improve the properties of this compound concrete is to supply it with a substantial amount of confinement as may be available in concrete-filled FRP tubes, which are attractive as columns in corrosive environments. This paper therefore presents and interprets the results of an experimental study on the compressive behavior of FRP confining tubes filled with compound concrete. The influences of various parameters, such as the mix ratio and the strength ratio between the old and the fresh concretes as well as the FRP tube thickness, are investigated. The test results indicate that with a significant level of confinement, the ultimate axial stress and the ultimate axial strain of the compound concrete containing RCLs are comparable with those of the fresh concrete, regardless of the strength of the old concrete. This conclusion is important as it means that the weaknesses of compound concrete containing RCLs can be largely eliminated through lateral confinement. The applicability of an accurate stress-strain model previously developed for FRP-confined normal concrete to FRP-confined compound concrete with RCLs is also examined.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The authors are grateful for the financial support provided by the Research Grants Council of the Hong Kong Special Administrate Region (PolyU 5285/10E and PolyU 5252/13E) and the Natural Science Foundation of China (Project No. 51108096).
References
ASTM. (2008). “Standard test method for apparent hoop tensile strength of plastic or reinforced plastic pipe by split disk method.” D2290-08, West Conshohocken, PA.
ASTM. (2012). “Standard test method for density, relative density (specific gravity), and absorption of coarse aggregate.” C127-12, West Conshohocken, PA.
Choi, W. C., and Yun, H. D. (2012). “Compressive behavior of reinforced concrete columns with recycled aggregate under uniaxial loading.” Eng. Struct., 41, 285–293.
Choi, W. C., Yun, H. D., and Kim, S. W. (2012). “Flexural performance of reinforced recycled aggregate concrete beams.” Mag. Concr. Res., 64(9), 837–848.
Demir, C., Kucukkapili, A., Doyrangol, D., and Ilki, A. (2014). “The effects of loading rate and duration on the axial behavior of low-strength and medium-strength noncircular concrete members confined by fiber-reinforced polymer sheets.” Polymers, 6(6), 1685–1704.
Jiang, T., and Teng, J. G. (2007). “Analysis-oriented stress-strain models for FRP-confined concrete.” Eng. Struct., 29(11), 2968–2986.
Jiang, T., and Teng, J. G. (2012). “Theoretical model for slender FRP-confined circular RC columns.” Constr. Build. Mater., 32, 66–76.
Lee, C. S., and Hegemier, G. A. (2009). “Model of FRP-confined concrete cylinders in axial compression.” J. Compos. Constr., 442–454.
Liang, M., Wu, Z. M., Ueda, T., Zheng, J. J., and Akogbe, R. (2012). “Experiment and modeling on axial behavior of carbon fiber reinforced polymer confined concrete cylinders with different sizes.” J. Reinf. Plast. Compos., 31(6), 389–403.
Lim, J. C., and Ozbakkaloglu, T. (2014a). “Hoop strains in FRP-confined concrete columns: Experimental observations.” Mater. Struct., in press.
Lim, J. C., and Ozbakkaloglu, T. (2014b). “Influence of silica fume on stress-strain behavior of FRP confined HSC.” Constr. Build. Mater., 63, 11–24.
Mirmiran, A., and Shahawy, M. (1996). “A new concrete filled hollow FRP composite column.” Compos. Part B, 27(3–4), 263–268.
Ozbakkaloglu, T. (2013). “Axial compressive behavior of square and rectangular high-strength concrete filled FRP tubes.” J. Compos. Constr., 151–161.
Ozbakkaloglu, T., and Akin, E. (2012). “Behavior of FRP confined normal- and high-strength concrete under cyclic axial compression.” J. Compos. Constr., 451–463.
Ozbakkaloglu, T., and Saatcioglu, M. (2006). “Seismic behavior of high-strength concrete columns confined by fiber reinforced polymer tubes.” J. Compos. Constr., 538–549.
Ozbakkaloglu, T., and Saatcioglu, M. (2007). “Seismic performance of square high-strength concrete columns in FRP stay-in-place formwork.” J. Struct. Eng., 44–56.
Ozbakkaloglu, T., and Vincent, T. (2014). “Axial compressive behavior of circular high-strength concrete filled FRP tubes.” J. Compos. Constr., 04013037.
Poon, C. S., Kou, S. C., and Lam, L. (2002). “Use of recycled aggregates in molded concrete bricks and blocks.” Constr. Build. Mater., 16(5), 281–289.
Saafi, M., Toutanji, H., and Li, Z. J. (1999). “Behavior of concrete columns confined with fiber reinforced polymer tubes.” ACI Mater. J., 96(4), 500–509.
Sagoe-Crentsil, K. K., Brown, T., and Taylor, A. H. (2001). “Performance of concrete made with commercially produced coarse recycled concrete aggregate.” Cem. Concr. Res., 31(5), 707–712.
Shahawy, M., Mirmiran, A., and Beitelman, T. (2000). “Tests and modeling of carbon-wrapped concrete columns.” Compos. Part B, 31(6–7), 471–480.
Tamuzs, V., Tepfers, R., Zile, E., and Valdmanis, V. (2007). “Stability of round concrete columns confined by composite wrappings.” Mech. Compos. Mater., 43(5), 445–452.
Teng, J. G., Huang, Y. L., Lam, L., and Ye, L. P. (2007). “Theoretical model for fiber-reinforced polymer-confined concrete.” J. Compos. Constr., 201–210.
Teng, J. G., Jiang, T., Lam, L., and Luo, Y. Z. (2009). “Refinement of a design-oriented stress-strain model for FRP-confined concrete.” J. Compos. Constr., 269–278.
Vincent, T., and Ozbakkaloglu, T. (2013). “Influence of fiber orientation and specimen end condition on axial compressive behavior of FRP-confined concrete.” Constr. Build. Mater., 47, 814–826.
Wu, B., Liu, C. H., and Yang, Y. (2013a). “Size effect on compressive behaviours of normal-strength concrete cubes made from demolished concrete blocks.” Mag. Concr. Res., 65(19), 1155–1167.
Wu, B., Liu, Q. X., Liu, W., and Xu, Z. (2008). “Primary study on recycled-concrete-segment filled steel tubular members.” Earthquake Resistant Eng. Retrofitting, 30(4), 120–124 (in Chinese).
Wu, B., Xu, Z., Liu, Q. X., and Liu, W. (2010). “Test on flexural behaviour of reinforced concrete beams filled with demolished concrete lump.” Earthquake Resistant Eng. Retrofitting, 32(1), 70–74 (in Chinese).
Wu, B., Xu, Z., Liu, Q. X., and Liu, W. (2011a). “Test on shear behaviour of reinforced concrete beams filled with demolished concrete lumps.” J. Build. Struct., 32(6), 99–106 (in Chinese).
Wu, B., Xu, Z., Ma, Z. G., Liu, Q. X., and Liu, W. (2011b). “Behavior of reinforced concrete beams filled with demolished concrete lumps.” Struct. Eng. Mech., 40(3), 411–429.
Wu, B., Zhao, X. Y., Liu, W., Liu, Q. X., and Xu, Z. (2011c). “Axial strengths of concrete stub columns filled with demolished concrete segments/lumps.” Adv. Sci. Lett., 4(8–10), 2719–2726.
Wu, B., Zhao, X. Y., and Zhang, J. S. (2012). “Cyclic behaviour of thin-walled square steel tubular columns filled with demolished concrete lumps and fresh concrete.” J. Constr. Steel Res., 77, 69–81.
Wu, B., Zhao, X. Y., Zhang, J. S., and Yang, Y. (2013b). “Cyclic testing of thin-walled circular steel tubular columns filled with demolished concrete blocks and fresh concrete.” Thin-Walled Struct., 66, 50–61.
Xiao, J. Z. (2008). Recycled concrete, China Architecture & Building Press, Beijing, China (in Chinese).
Xiao, J. Z., Li, J. B., and Zhang, C. (2005). “Mechanical properties of recycled aggregate concrete under uniaxial loading.” Cem. Concr. Res., 35(6), 1187–1194.
Xiao, J. Z., Li, W. G., Fan, Y. H., and Huang, X. (2012). “An overview of study on recycled aggregate concrete in China (1996–2011).” Constr. Build. Mater., 31, 364–383.
Yang, Y. F., and Han, L. H. (2006). “Experimental behavior of recycled aggregate concrete filled steel tubular columns.” J. Constr. Steel Res., 62(12), 1310–1324.
Yu, T., and Teng, J. G. (2011). “Design of concrete-filled FRP tubular columns: provisions in the draft Chinese code.” J. Compos. Constr., 451–461.
Zhang, B., Yu, T., and Teng, J. G. (2015). “Behavior of concrete filled FRP tubes under cyclic axial compression.” J. Compos. Constr., 04014060.
Zhao, J. L., Yu, T., and Teng, J. G. (2015). “Stress-strain behaviour of FRP-confined recycled aggregate concrete.” J. Compos. Constr., 04014054.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 20 • Issue 1 • February 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jan 14, 2015
Accepted: May 21, 2015
Published online: Jul 22, 2015
Discussion open until: Dec 22, 2015
Published in print: Feb 1, 2016
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.