Title:
Sustained Service Load Behavior of Concrete Beams with Recycled Concrete Aggregates
Author(s):
Adam M. Knaack and Yahya C. Kurama
Publication:
Structural Journal
Volume:
112
Issue:
5
Appears on pages(s):
565-578
Keywords:
beam deflections; neutral axis; recycled concrete aggregate (RCA); sustained load
DOI:
10.14359/51687799
Date:
9/1/2015
Abstract:
This paper describes an experimental investigation on the time-dependent sustained service-load behavior of normal-strength
concrete beams with recycled concrete aggregates (RCA) used as replacement for coarse natural aggregates (NA). Eighteen beams were tested incorporating different aggregate replacement amounts, reinforcing details, concrete age at superimposed loading, and beams with and without cracking upon immediate load application. It is shown that increased amounts of RCA result in significant increases in both the immediate and long-term deflections of concrete beams,
but this effect is smaller for beams with increased cracking. Greater creep and shrinkage deformations also cause a greater downward shifting of the neutral axis (that is, increase of the neutral axis depth) in RCA concrete beams as compared to NA concrete beams. ACI 318 and Eurocode generally gave good design estimates for the immediate deflections of the test specimens. In comparison, the long-term deflections were significantly underestimated for the uncracked beams. For the cracked beams, the long-term deflections were somewhat
underestimated by ACI 318 and overestimated by Eurocode
by approximately similar percent errors. The ability of the design methods to predict the measured deflections did not differ significantly between the NA concrete and RCA concrete beams.
Related References:
1. ACI Committee 318, “Building Code Requirements for Structural Concrete and Commentary (ACI 318-11),” American Concrete Institute, Farmington Hills, MI, 2011, 503 pp.
2. BS EN 1992-1-1, “Eurocode 2: Design of Concrete Structures. General Rules and Rules for Buildings,” British Standards Institution, Brussels, Belgium, 2004.
3. Knaack, A., and Kurama, Y., “Sustainable Concrete Structures Using Recycled Concrete Aggregate: Short-Term and Long-Term Behavior Considering Material Variability,” NDSE Report 13-01, University of Notre Dame, Notre Dame, IN, 2013, www.nd.edu/~concrete/RCA-concrete.
4. Ajdukiewicz, A., and Kliszczewicz, A., “Long-Term Behavior of Reinforced-Concrete Beams and Columns Made of Recycled Aggregate Concrete,” fib Symposium, Prague, Czech Republic, 2011, pp. 479-482.
5. Choi, W., and Yun, H., “Long-Term Deflection and Flexural Behavior of Reinforced Concrete Beams with Recycled Aggregate,” Materials & Design, V. 51, 2013, pp. 742-750. doi: 10.1016/j.matdes.2013.04.044
6. Lapko, A., and Grygo, R., “Long Term Deflection of Recycled Aggregate Concrete (RAC) Beams Made of Recycled Concrete,” 10th International Conference: Modern Building Materials, Structures and Techniques, Vilnius, Lithuania, 2010.
7. Sato, R.; Maruyama, I.; Sogabe, T.; and Sogo, M., “Flexural Behavior of Reinforced Recycled Concrete Beams,” Journal of Advanced Concrete Technology, V. 5, No. 1, 2007, pp. 43-61. doi: 10.3151/jact.5.43
8. Li, X., “Recycled and Reuse of Waste Concrete in China Part II: Structural Behavior of Recycled Aggregate Concrete and Engineering Applications,” Resources, Conservation and Recycling, V. 53, No. 3, 2009, pp. 107-112. doi: 10.1016/j.resconrec.2008.11.005
9. ACI Committee 555, “Removal and Reuse of Hardened Concrete (ACI 555R-01),” American Concrete Institute, 2001, Farmington Hills, MI, 26 pp.
10. Domingo-Cabo, A.; Lázaro, C.; López-Gayarre, F.; Serrano-López, M.; Ros, S. P.; and Castaño-Tabares, J., “Creep and Shrinkage of Recycled Aggregate Concrete,” Construction & Building Materials, V. 23, No. 3, 2009, pp. 2545-2553. doi: 10.1016/j.conbuildmat.2009.02.018
11. Fathifazl, G.; Abbas, A.; Razaqpur, A.; Isgor, O.; and Foo, S., “New Mixture Proportioning Method for Concrete Made with Coarse Recycled Concrete Aggregate,” Journal of Materials in Civil Engineering, ASCE, V. 21, No. 10, 2009, pp. 601-611. doi: 10.1061/(ASCE)0899-1561(2009)21:10(601)
12. Hansen, T., “Recycled Aggregates and Recycled Aggregate Concrete Second State-of-the-Art Report Developments 1945-1985,” Materials and Structures, V. 19, No. 3, 1986, pp. 201-246. doi: 10.1007/BF02472036
13. Kerkhoff, B., and Siebel, E., “Properties of Concrete with Recycled Aggregates,” Beton, V. 2/2001, 2001, pp. 47-58.
14. Knaack, A., and Kurama, Y., “Design of Concrete Mixtures with Recycled Concrete Aggregates,” ACI Materials Journal, V. 110, No. 5, Sept.-Oct. 2013, pp. 483-494.
15. Yamato, T., “Mechanical Properties, Drying Shrinkage and Resistance to Freezing and Thawing of Concrete using Recycled Aggregate,” Fourth CANMET/ACI/JCI International Symposium: Advances in Concrete Technology, SP-179, V. M. Malhotra, ed., American Concrete Institute, Farmington Hills, MI, 1998, pp. 103-121.
16. Fathifazl, G., and Razaqpur, A., “Creep Rheological Models for Recycled Aggregate Concrete,” ACI Materials Journal, V. 110, No. 2, Mar.-Apr. 2013, pp. 115-125.
17. Fathifazl, G.; Razaqpur, A.; Isgor, O.; Abbas, A.; Fournier, B.; and Foo, S., “Creep and Drying Shrinkage Characteristics of Concrete Produced with Coarse Recycled Concrete Aggregate,” Cement and Concrete Composites, V. 33, No. 10, 2011, pp. 1026-1037. doi: 10.1016/j.cemconcomp.2011.08.004
18. Domingo, A.; Lázaro, C.; Gayarre, F.; Serrano, M.; and Lopez-Colina, C., “Long Term Deformations by Creep and Shrinkage in Recycled Aggregate Concrete,” Materials and Structures, V. 43, No. 8, 2010, pp. 1147-1160. doi: 10.1617/s11527-009-9573-0
19. INDOT, “Standard Specifications,” 2012, Indiana Department of Transportation.
20. ASTM C127-07, “Standard Test Method for Density, Relative Density (Specific Gravity), and Absorption of Coarse Aggregate,” ASTM International, West Conshohocken, PA, 2007, 6 pp.
21. ASTM C128-07, “Standard Test Method for Density, Relative Density (Specific Gravity), and Absorption of Fine Aggregate,” ASTM International, West Conshohocken, PA, 2007, 7 pp.
22. Abbas, A.; Fathifazl, G.; Isgor, O. B.; Razaqpur, A. G.; Fournier, B.; and Foo, S., “Proposed Method for Determining the Residual Mortar Content of Recycled Concrete Aggregates,” Journal of ASTM International, V. 5, No. 1, 2008, pp. 1-12.
23. ASTM C131-06, “Standard Test Method for Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact on the Los Angeles Machine,” ASTM International, West Conshohocken, PA, 2006, 4 pp.
24. ASTM C150/C150M-09, “Standard Specification for Portland Cement,” ASTM International, West Conshohocken, PA, 2009, 10 pp.
25. ASTM C260-06, “Standard Specification for Air-Entraining Admixtures for Concrete,” ASTM International, West Conshohocken, PA, 2006, 3 pp.
26. ASTM C494/C494M-08, “Standard Specification for Chemical Admixtures for Concrete,” ASTM International, West Conshohocken, PA, 2008, 10 pp.
27. ASTM C192/C192M-07, “Standard Practice for Making and Curing Concrete Test Specimens in the Laboratory,” ASTM International, West Conshohocken, PA, 2007, 8 pp.
28. ASTM C512/C512M-02, “Standard Test Method for Creep of Concrete in Compression,” ASTM International, West Conshohocken, PA, 2002, 4 pp.
29. ASTM C39/C39M-09, “Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens,” ASTM International, West Conshohocken, PA, 2009, 7 pp.
30. ASTM C293-08, “Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading),” ASTM International, West Conshohocken, PA, 2008, 3 pp.
31. Kosmatka, S.; Kerkhoff, B.; and Panarese, W., Design and Control of Concrete Mixtures, 14th edition, Portland Cement Association, Skokie, IL, 2002, 358 pp.
32. ASTM A370-09, “Standard Test Methods and Definitions for Mechanical Testing of Steel Products,” ASTM International, West Conshohocken, PA, 2009, 47 pp.
33. Webster, R., and Brooker, O., “How to Design Concrete Structures Using Eurocode 2: Deflection Calculations,” The Concrete Centre, Camberley, UK, 2006, 8 pp.