Comparison of Inorganic and Organic Matrices for Strengthening of RC Beams with Carbon Sheets
Publication: Journal of Structural Engineering
Volume 127, Issue 1
Abstract
The performance of an inorganic matrix is compared to the performance of an organic matrix when used to externally strengthen reinforced concrete beams with carbon fiber sheets. The experimental study consisted of testing reinforced concrete beams after they were strengthened with carbon fiber sheets that were bonded with an inorganic matrix. This experimental study simulates an earlier study in which beams were strengthened in the same way using an organic matrix. Strength, stiffness, ductility, failure pattern, and cracking of beams strengthened with the two systems are compared. The results indicate that the inorganic matrix is as effective in increasing the strength and stiffness of reinforced concrete beams as the organic matrix, with a minor reduction in ductility. The failure mechanism changed from sheet delamination for the organic system to sheet rupture for the inorganic system. This change in mechanism is attributed to the brittleness of the inorganic matrix that results in crack formation in the composite and a minimum buildup of strain along the interface of the composite and concrete.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Arduini, M., and Nanni, A. (1997). “Behavior of precracked RC beams strengthened with carbon FRP sheets.”J. Compos. for Constr., ASCE, 1(2), 63–70.
2.
Chajes, M. J., Januszka, T. F., Mertz, D. R., Thomson, T. A., Jr. and Finch, W. W., Jr. ( 1995). “Shear strengthening of reinforced concrete beams using externally applied composite fabrics.” ACI Struct. J., 92(3), 295–303.
3.
Foden, A. J. ( 1999). “Mechanical properties and material characterization of polysialate structural composites.” PhD dissertation, Rutgers University, New Brunswick, N.J.
4.
Foden, A., Lyon, R., Balaguru, P., and Davidovitz, J. ( 1996). “High temperature inorganic resin for use in fiber reinforced composites,” Proc., 1st Int. Conf. on Compos. in Infrastruct., ICCI'96, Dept. of Civ. Engrg. and Engrg. Mech., Univ. of Arizona, Tucson, Ariz., 166–177.
5.
Tonen Corp.,
6.
Hammell, J. A., Lyon, R. E., and Balaguru, P. ( 1998). “Influence of reinforcement types on the flexural properties of geopolymer composites.” SAMPE Int. Symp., 43, 1200–1210.
7.
Lyon, R. E., Balaguru, P. N., Foden, A., Sorathia, U., Davidovitz, J., and Davidovics, M. ( 1997). “Fire resistant aluminosilicate composites,” Fire and Mat., 21(2), 67–73.
8.
M'Bazaa, I. M., Missihoun, M., and Labossiere, P. ( 1996). “Strengthening of reinforced concrete beams with CFRP sheets.” Proc., 1st Int. Conf. on Compos. in Infrastruct., ICCI'96, Dept. of Civ. Engrg. and Engrg. Mech., Univ. of Arizona, Tucson, Ariz., 746–759.
9.
Nakamura, M., Sakai, H., Yagi, K., and Tanaka, T. ( 1996). “Experimental studies on the flexural reinforcing effect of carbon fiber sheet bonded to reinforced concrete beam.” Proc., 1st Int. Conf. on Compos. in Infrastruct., ICCI'96, Dept. of Civ. Engrg. and Engrg. Mech., Univ. of Arizona, Tucson, Ariz., 760–773.
10.
Ritchie, P.A., Thomas, D. A., Lu, L-W., and Connelly, G. M. ( 1991). “External reinforcement of concrete beams using fiber reinforced plastics.” ACI Struct. J., 88(4), 490–499.
11.
Ross, C. A., Jerome, D. M., Tedesco, J. W., and Hughes, M. L. ( 1999). “Strengthening of reinforced concrete beams with externally bonded composite laminates.” ACI Struct. J., 96(2), 212–220.
12.
Saadatmanesh, H., and Ehsani, M. R. ( 1990). “Fiber composite plates can strengthen beams.” ACI Concrete Int., 12(3), 65–71.
13.
Saadatmanesh, H., and Ehsani, M. R. (1991a). “RC beams strengthened wih GFRP plates. I: Experimental study.”J. Struct. Engrg., ASCE, 117(11), 3417–3433.
14.
Saadatmanesh, H., and Ehsani, M. R. (1991b). “RC beams strengthened with GFRP plates. II: Analytical and parametric studies.”J. Struct. Engrg., ASCE, 117(11), 3434–3455.
15.
Sharif, A., Al-Sulaimani, G. J., Basunbul, I. A., Baluch, M. H., and Ghaleb, B. N. ( 1994). “Strengthening of initially loaded reinforced concrete beams using FRP plates.” ACI Struct. J., 91(2), 160–168.
16.
Spadea, G., Bencardino, F., and Swamy, R. N. (1998). “Structural behavior of composite RC beams with externally bonded CFRP.”J. Compos. for Constr., ASCE, 2(3), 132–137.
17.
ACI 440-R-57, American Concrete Institute, Detroit.
Information & Authors
Information
Published In
History
Received: Oct 6, 1999
Published online: Jan 1, 2001
Published in print: Jan 2001
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.