Title:
Review and Analysis of FRP Bond Lengths from Pull-out Testing Database with Reduced Embedment Lengths
Author(s):
John J. Myers
Publication:
Symposium Paper
Volume:
360
Issue:
Appears on pages(s):
21-35
Keywords:
Bond performance; Bond strength; Embedment length; Pull-out test; Rebar diameter; Rebar type.
DOI:
10.14359/51740614
Date:
3/1/2024
Abstract:
The American Concrete Institute (ACI) 440.1R-15 Guide for the Design and Construction of Structural Concrete Reinforced with Fiber-Reinforced Polymer (FRP) Bars linearly reduces the bar stress and thereby pull-out capacity of FRP bars to zero from an embedment length at 20 bar diameters (db) or less. Most experimental research and data examine the development length of various FRP bars at longer, more traditional, embedment lengths. A database was created from select available data in literature to compare to empirical standards. This investigation examines the bond performance of short embedded FRP bars into concrete considering a pull-out failure mode to expand the understanding of short embedded FRP bars into concrete. Based upon the database collected, for the glass fiber-reinforced polymer (GFRP) rebars, the current 440.1R appear quite conservative. For the basalt fiber-reinforced polymer (BFRP) rebar database collected, the current ACI 440.1R-15 provisions appear unconservative for a statistically significant number of the specimen test results within the database. In the case of the carbon fiber-reinforced polymer (CFRP) database, which is quite limited, the data appears to develop considerably less bond strength than the current 440.1R provisions might suggest which requires deeper investigation for the case of short embedment length bonded CFRP bars.
Related References:
Al-Khafaji, A.F., Myers, J.J., Alghazali, H.H. (2022a). Bond study of corrosion-free reinforcement embedded in ecofriendly concrete,” American Concrete Institute, SP 356(1), pp 1-35.
Al-Khafaji, A.F., Myers, J.J., Alghazali, H.H. (2022b). Bond assessment of GFRP bars embedded in fiber-reinforced eco-concrete,” Lecture Notes in Civil Engineering, 118(2022), 243-252.
Al-Khafaji, A.F., Myers, J.J., Alghazali, H.H. (2021). Evaluation of bond performance of glass fiber rebars embedded in sustainable concrete, Elsevier’s Journal of Cleaner Production, Vol. 282(124516), 1-16.
Alghazali, H.H., Myers, J.J. (2017) Performance study of ecological self-consolidating cement mixtures (ECOSCCM), American Society of Civil Engineering – Journal of Materials in Civil Engineering, 29(12), 1-11.
Al-Zahrani M.M., Nanni A., Al-Dulaijan S.U., Bakis C.E. (1996) Bond of FRP to concrete in reinforcement rods with axisymmetric de-formations. Proceedings of the 2nd International Conference on Advanced Composite Materials in Bridges and Structures. 1996:853.
Baena, M., Torres, L., Barris, C. (2009). Experimental study of bond behavior between concrete and FRP bars using a pull-out test. Elsevier’s Composites: Part B, 40(2009), 784-797.
El Refai, A., Ammar, M.A., Masmoudi, R. (2015). Bond performance of basalt fiber-reinforced polymer bars to concrete. ASCE Journal of Composites for Construction, 19(3), 1-12.
Gouda, O., Hassanein, A., Galal, K. (2022). Proposed Development Equations for GFRP Bars in Flexural Reinforced Concrete Members. ASCE Journal of Composites for Construction, 27(1), 1-25.
Hassan, M., Benmokrane, B., ElSafty, A., Fam, A. (2016). Bond durability of BFRP bars embedded in concrete in aggressive environments. Elsevier’s Composites: Part B, 106(2016), 262-272.
Hussain, S., Khan, M.Z.N., Khan, H.A. (2022). Bond performance of basalt FRP bar against aggressive environment in high-strength concrete with varying bar diameter and bond length. Elsevier’s Construction and Building Materials, 349(2022), 1-12.
Katz, A., Berman, N., Bank, L.C. (1999). Effect of high temperature on bond strength of FRP rebars. ASCE Journal of Composites for Construction, 3(2), 73-81.
Lu, Z., Su, L., Lai, J., Xie, J., Yuan, B. (2021). Bond durability of BFRP bars embedded in concrete with fly ash in aggressive environments. Elsevier’s Composite Structures, 271(2021), 1-12.
RILEM. (1994). RILEM recommendations for the testing and use of constructions materials, RC 6 bond test for reinforcement steel 2. Pull-out test. E & FN SPON; 1994, 218–220.
Subhani, M. Shill, S.K., Garcez, E. (2022). Effect of various rebar types and crushed glass coating onto BFRP rebar on the bond strength to concrete. Journal of Adhesion Science and Technology, (2023), 1-20.
Tighiouart B., Benmokrane, B., Gao, D. (1998). Investigation of bond in concrete with polymer (FRP) bars. Elsevier’s Construction and Building Materials, 12(1998), 453-462.
Wang, W., Wang, Y., Li, Dongdong (2021). Bond-slip behavior between basalt fiber reinforced plastic bars and recycled aggregate concrete. Elsevier’s Construction and Building Materials, 302(2021), 1-14.
Yoo, D.Y., Kwon, K.Y., Park, J.J., Yoon, Y.S. (2015). Local bond-slip response of GFRP rebar in ultra-highperformance fiber-reinforced concrete. Elsevier’s Composite Structures, 120(2015), 53-64.