Title:
Shear-Friction Behavior of Recycled and Natural Aggregate Concrete—An Experimental Investigation
Author(s):
Khaldoun N. Rahal and Abdul-Lateef Al-Khaleefi
Publication:
Structural Journal
Volume:
112
Issue:
6
Appears on pages(s):
725-733
Keywords:
recycled aggregates; reinforced concrete; shear; slip; strength
DOI:
10.14359/51687748
Date:
11/1/2015
Abstract:
The results of an experimental investigation of the shear-friction behavior of recycled and natural coarse aggregate concrete are reported. Eighteen non-precracked pushoff specimens were tested. The percentages of replacement of coarse aggregates with recycled aggregates in the concrete mixtures were 0%, 50%, or 100%. The specimens made of the same concrete had different amounts of clamping reinforcement across the shear-transfer plane. It is shown that all specimens with clamping reinforcement resisted significant post-ultimate strengths, in addition to relatively large slips along the shear-transfer planes. It is also shown that the full replacement of conventional aggregate with recycled aggregate
had a limited effect on the ultimate and post-ultimate reserve shearing strength, while partial replacement (50%) caused a more significant reduction in the ultimate shearing strength. The results also showed that the ultimate strength was reached as soon as the clamping steel yielded. The nominal strength calculated using the shear friction model of the ACI Code, using a coefficient of friction suitable for monolithic construction, was significantly lower than the observed ultimate strength. The calculated strength was closer to the post-ultimate strength.
Related References:
1. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-11) and Commentary,” American Concrete Institute, Farmington Hills, MI, 2011, 503 pp.
2. CSA A23.3-04, “Design of Concrete Structures,” Canadian Standards Association, Mississauga, ON, Canada, 2004, 214 pp.
3. EN 1992–1–1, “Eurocode 2: Design of Concrete Structures—Part 1-1: General Rules and Rules for Buildings,” European Committee for Standardization, Brussels, Belgium, 2004.
4. Ali, M. A., and White, R. N., “Enhanced Contact Model for Shear Friction of Normal and High-Strength Concrete,” ACI Structural Journal, V. 96, No. 3, May-June 1999, pp. 348-362.
5. Mattock, A. L., “Shear-Friction and High-Strength Concrete,” ACI Structural Journal, V. 98, No. 1, Jan.-Feb. 2001, pp. 50-59.
6. Kahn, L., and Mitchell, A. D., “Shear Friction Tests with High-Strength Concrete,” ACI Structural Journal, V. 99, No. 1, Jan.-Feb. 1999, pp. 98-103.
7. Rahal, K. N., “Shear Transfer Capacity of Reinforced Concrete,” ACI Structural Journal, V. 107, No. 4, July-Aug. 2010, pp. 419-426.
8. Hofbeck, J. A.; Ibrahim, I. O.; and Mattock, A. H., “Shear Transfer in Reinforced Concrete,” ACI Journal Proceedings, V. 66, No. 2, Feb. 1969, pp. 119-128.
9. Walraven, J. C.; Frenay, J.; and Pruijssers, A., “Influence of Concrete Strength and Load History on the Shear Friction Capacity of Concrete Members,” PCI Journal, V. 32, No. 1, 1987, pp. 66-84.
10. Nagle, T. J., and Kuchma, D. A., “Shear Transfer Resistance in High-Strength Concrete Girders,” Magazine of Concrete Research, V. 59, No. 8, 2007, pp. 611-620. doi: 10.1680/macr.2007.59.8.611
11. Xiao, J.; Xie, H.; and Yang, Z., “Shear Transfer across a Crack in Recycled Aggregate Concrete,” Cement and Concrete Research, V. 42, No. 5, 2012, pp. 700-709. doi: 10.1016/j.cemconres.2012.02.006
12. Rahal, K. N., “Mechanical Properties of Concrete with Recycled Coarse Aggregate,” Building and Environment, V. 42, No. 1, 2007, pp. 407-415. doi: 10.1016/j.buildenv.2005.07.033
13. de Juan, M. S., and Gutierrez, P. A., “Study on the Influence of Attached Mortar Content on the Properties of Recycled Concrete Aggregate,” Construction and Building Materials, V. 23, No. 2, 2009, pp. 872-877. doi: 10.1016/j.conbuildmat.2008.04.012
14. Vecchio, F. J., and Collins, M. P., “Modified Compression Field Theory for Reinforced Concrete Elements Subjected to Shear,” ACI Journal Proceedings, V. 83, No. 2, Mar.-Apr. 1986, pp. 219-231.
15. Rahal, K. N., “Post-Cracking Shear Modulus of Reinforced Concrete Membrane Elements,” Engineering Structures, V. 32, No. 1, 2010, pp. 218-225. doi: 10.1016/j.engstruct.2009.09.008
16. Etxeberria, M.; Mari, A. R.; and Vazquez, E., “Recycled Aggregate Concrete as Structural Material,” Materials and Structures, V. 40, No. 5, 2007, pp. 529-541. doi: 10.1617/s11527-006-9161-5
17. Xiao, J., and Falkner, H., “Bond Behaviour between Recycled Aggregate Concrete and Steel Rebars,” Construction and Building Materials, V. 21, No. 2, 2007, pp. 395-401. doi: 10.1016/j.conbuildmat.2005.08.008
18. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-05) and Commentary,” American Concrete Institute, Farmington Hills, MI, 2005, 430 pp.