BOND DURABILITY OF STEEL PLATE TO CONCRETE PRISM USING STRUCTURAL ADHESIVES AFTER EXPOSURE TO 7-YEARS IN LABORATORY ENVIRONMENT
DOI:
https://doi.org/10.11113/mjce.v29.15699Keywords:
Epoxy bonding, steel plate, pull out Test, durability, tropical conditionAbstract
Structural integrity and durability has long been an area of study that is critical in order to ensure structures such as buildings, bridges etc. are safe enough to stand erected for many years. The technique of bonding steel plates to the surface of concrete using epoxy adhesives system has been used on a number of structures throughout the world to enhance load transferring capability. Deterioration in strength of concrete structures due to corrosion of steel can cause premature failure in existing structures or buildings. The objective of this study is to investigate the bond performance of steel to concrete using structural epoxy system. The sample at hand was prepared and left exposed for 7 years under normal ambient laboratory environments. This study focused on the outcome of bond performances of the bonded steel plate to concrete prism under pull out load. The sample (SPECS-7) that used in this study is approximately 7 years old with the steel plates surfaces was corroded and being compared with sample (SPECS-1) tested in 2008. The maximum load and maximum extension recorded at failure by sample SPECS-7 is 76.85kN and 3.04 mm at 181.8s which shows a decrease by 7 kN or 8% and 5.70 mm to 3.04 mm or 46% compared with sample SPECS-1 respectively. The extension comparison with SPEC-1 shows a reduction from 5.70 mm to 3.04 mm which is about 46 % less. There was significant amount of corrosion developed over the years which does not show to have affected the overall performance of the bonded system. Nevertheless, there was on average a small increase in bond strength with time although the controlled sample failed at a marginally lower loadReferences
Abu Hassan, S., Gholami, M., Ismail, Y. S., & Mohd Sam, A. R. (2015). Characteristics of Concrete / CFRP Bonding System Under Natural Tropical Climate. Construction and Building Materials, 77(July), 297–306.
Bakis, C. E., Bank, L. C., Brown, V. L., Cosenza, E., Davalos, J. F., Lesko, J. J., … Triantafillou, T. C. (2002). Fiber-Reinforced Polymer Composites for Construction—State-of-the-Art Review. Journal of Composites for Construction, 6(2), 73–87.
Baldwins, R. (2011). Mild Steel Product Guide.
Broughton, J. G. U., & Hutchinson, A. R. (2001). Effect of timber moisture content on bonded-in rods, (February 2000).
Davalos, J. F., & Qiao, P. (2001). Interface Durability of Construction Materials Externally Reinforced with FRP Composites.
Dong, Z., Wu, G., & Xu, Y. (2016). Experimental study on the bond durability between steel-FRP composite bars (SFCBs) and sea sand concrete in ocean environment. Construction and Building Materials, 115, 277–284.
GangaRao, H. V. S., & Vijay, P. V. (1998). Bending Behavior of Concrete Beams. Journal of Structural Engineering, 6(January), 3–10.
Hassan, S. A., Ismail, Y. S., & Sam, A. R. M. (2009). Load sustained rig for bond durability study. Jurnal Mekanikal, 28(June), 16–27.
Ling, P. C. C., Sam, A. R. M., & Hassan, S. A. (2008). Bonding Behavior between CFRP and Steel Plates to Concrete Prisms.
Lorenzis, L. De, Scialpi, V., & Tegola, A. La. (2005). Analytical and experimental study on bonded-in CFRP bars in glulam timber. Composites Part B: Engineering, 36(4), 279–289.
Mohamed, K. b. (2007). The development of a Mathematical Model for predicting bonding behaviour of CFRP Plate-Epoxy-Concrete Bonded System. Universiti Teknologi Malaysia.
Mostofinejad, D., & Shameli, M. (2011). Performance of EBROG Method under Multilayer FRP Sheets for Flexural Strengthening of Concrete Beams. Procedia Engineering, 14, 3176–3182.
Sen, R. (2015). Developments in the durability of FRP-concrete bond. Construction and Building Materials, 78, 112–125.
Seracino, R., Jones, N. M., Ali, M. S. M., Page, M. W., & Oehlers, D. J. (2007). Bond Strength of Near-Surface Mounted FRP Strip-to-Concrete Joints. Journal of Composites for Construction, 11(August), 401–409.
Setunge, S., Nezamian, A., & Lokuge, W. (2002). Review of strengthening techniques using externally bonded fiber reinforced polymer composites.
Smith, S. T. (2011). Strengthening of Concrete, Metallic and Timber Construction Materials with FRP Composites. The 5th International Conference on FRP Composites in Civil Engineering (CICE 2010), 13–19.
Zheng, X. H., Huang, P. Y., Chen, G. M., & Tan, X. M. (2015). Fatigue Behavior of FRP–Concrete Bond Under Hygrothermal Environment. Construction and Building Materials, 95, 898–909.