Browse > Article
http://dx.doi.org/10.4334/JKCI.2016.28.1.085

Flexural Performance of Slabs Strengthened by Fiber-Reinforced Polymer Sheet with Hydrophilic Epoxy  

Ju, Hyunjin (Department of Architectural Engineering, University of Seoul)
Han, Sun-Jin (Institute of Urban Science, University of Seoul)
Cho, Hae-Chang (Department of Architectural Engineering, University of Seoul)
Lee, Deuck Hang (Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign)
Kim, Kang Su (Department of Architectural Engineering, University of Seoul)
Publication Information
Journal of the Korea Concrete Institute / v.28, no.1, 2016 , pp. 85-94 More about this Journal
Abstract
In this study, the hydrophilic chemical grout using silanol (HCGS) was introduced to overcome the limitations of conventional epoxy resin which have been used for strengthening reinforced concrete (RC) structures. Then, flexural tests on the RC slabs strengthened by FRP sheets were conducted. Three slab specimens were tested in this study; a control specimen with no strengthening, and two specimens strengthened by a typical epoxy resin or HCGS, respectively, as a binder between the slabs and the FRP sheets. In addition, an analytical model was developed to evaluate the flexural behavior of strengthened slab members, considering the horizontal shear force at the interface between concrete slabs and FRP sheets. The analysis results obtained from the proposed model indicated that the strengthened specimens showed fully composite behavior before their flexural failure. Especially, the specimen strengthened by HCGS, which can overcome the limitations of conventional epoxy resin, showed a similar flexural performance with that strengthened by a conventional epoxy resin.
Keywords
flexural performance; FRP; grout; strengthening; epoxy; HCGS;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Newman, A., Structural Renovation of Buildings: Methods, Details, and Design Examples, McGraw-Hill, 2001, p.867.
2 Seo, S.Y., and Kim, M.S., "Bond Strength of Near Surface-Mounted FRP Plate in Concrete Corresponding to Space and Bond Length", Journal of the Korea Concrete Institute, Vol.25, No.1, 2013, pp.37-43.   DOI
3 Cho, C.G., "Nonlinear Analysis of FRP Strengthened Reinforced Concrete Columns by Force-Based Finite Element Model", Journal of the Korea Concrete Institute, Vol.25, No.5, 2013, pp.529-537.   DOI
4 Lee, J.Y., Hwang, H.B, and Doh, J.H., "Effective Strain of RC Beams Strengthened in Shear with FRP", Composites Part B: Engineering, Vol.42, No.2, 2012, pp.754-765.
5 El-Mihilmy, M.T. and Tedesco, J.W., "Prediction of Anchorage Failure for Reinforced Concrete Beams Strengthened with Fiber-Reinforced Polymer Plates", ACI Structural Journal, Vol.98, No.3, 2001, pp.301-314.
6 Smith, S.T., and Teng, J.G., "Interfacial Stresses in Plated Beams", Engineering Structures, Vol.23, No.7, 2001, pp.857-871.   DOI
7 Cai, C.S., Nie, J., and Shi, X.M., "Interface Slip Effect on Bonded Plate Repairs of Concrete Beams", Engineering Structures, Vol.29, No.6, 2007, pp.1084-1095.   DOI
8 Alam, M.S., Kanakubo, T., and Yasojima, A, "Shear-Peeling Bond Strength betweeen Continuous Fiber Sheet and Concrete", ACI Structural Journal, Vol.109, No.1, 2012, pp.75-82.
9 Malek, A.M., Saadatmanesh, H., and Ehsani, M.R., "Prediction of Failure Load of R/C Beams Strengthened with FRP Plate Due to Stress Concentration at the Plate End", ACI Structural Journal, Vol.95, No.2, 1998, pp.142-152.
10 Silfwerbrand, J., "Shear Bond Strength in Repaired Concrete Structures", Materials and Structures, Vol.36, No.6, 2003, pp.419-424.   DOI
11 Tsioulou, O.T., and Dritsos, S.E., "A Theoretical Model to Predict Interface Slip due to Bending", Materials and Structures, Vol.44, No.4, 2011, pp.825-843.   DOI
12 Kwon, H.M., Nguyen, T.N., and Le, T.A., "Improvement of the Strength of Acrylic Emulsion Polymer-modified Mortar in High Temperature and High Humidity by Blast Furnace Slag", KSCE Journal of Civil Engineering, Vol.13, No.1, 2009, pp.23-30.   DOI
13 Ko, H.B., and Sate, Y., "Analysis of FRP-Strengthened RC Members with Varied Sheet Bond Stress-Slip Models", Journal of Advanced Concrete Technology, Vol.2, No.3, 2004, pp.317-326.   DOI
14 Gohnert, M., "Proposed Theory to Determine the Horizontal Shear between Composite Precast and in Situ Concrete", Cement & Concrete Composites, Vol.22, No.6, 2000, pp.469-476.   DOI
15 Ju, H., Lee, D.H., Cho, H.C., Kim, K.S., Yoon, S., and Seo, S.Y., "Application of Hydrophilic Silanol-Based Chemical Grout for Strengthening Damaged Reinforced Concrete Flexural Members," Materials, Vol.7, No.6, 2014, pp.4823-4844.   DOI
16 Callister, W.D., Materials Science and Engineering: An Introduction, 7th Ed., John Wiley & Sons, 2007, p.721.
17 Plum, D.R., and Horne, M.R., "The Analysis of Continuous Composite Beams with Partial Interaction", Institution of Civil Engineers Proceedings, Vol.59, No.4, 1975, pp.625-643.
18 Fabbrocino, G., Manfredi, G., and Cosenza, E., "Non-linear Analysis of Composite Beams under Positive Bending", Computers & Structures, Vol.70, No.1, 1999, pp.77-89.   DOI
19 Fabbrocino, G., Manfredi, G., and Cosenza, E., "Analysis of Continuous Composite Beams Including Partial Interaction and Bond", Journal of Structural Engineering, ASCE, Vol.126, No.11, 2000, pp.1288-1294.   DOI
20 Newmark, N.M., Siess, C.P., and Viest, I.M., "Tests and Analysis of Composite Beams with Incomplete Interaction", Proceedings of the Society for Experimental Stress Analysis, Vol.9, No.1, 1951, pp.75-92.
21 Saiidi, M., Vrontinos, S., and Douglas, B., "Model for the Response of Reinforced Concrete Beams Strengthened by Concrete Overlays", ACI Structural Journal, Vol.87. No.6, 1990, pp.687-695.
22 Collins, M.P., and Mitchell, D., Prestressed Concrete Structures, Prentice-Hall, 1991, p.766.
23 MacGregor, J.G., and Wight, J.K., Reinforced Concrete: Mechanics and Design, 4th Ed., Pearson Prentice Hall, 2009, p.1112.