Experimental Studies on Bond Performance of BFRP Bars Reinforced Coral Aggregate Concrete
Tóm tắt
Basalt fiber reinforced polymer (BFRP) rebars reinforced coral aggregate concrete is a new type of concrete used in ocean engineering. In order to investigate the bond performance between BFRP rebars and coral concrete, 30 pull-out tests were carried out in 10 groups with different diameters of BFRP rebars, bonding lengths and strength of the coral concrete. The results show that good bonding between BFRP rebars and coral concrete were achieved. The main failure modes can be categorized as BFRP rebars pull out destruction, splitting failure of coral concrete and BFRP rebars fracture. The bond slip (
$$\tau{\text{-}}s$$
) curves of the BFRP rebars and coral concrete were obtained during the tests. It was found to be similar to the common concrete using fiber reinforced polymer (FRP) bars. The bond-slip relation can be roughly divided into micro-slip phase, slip phase, decline phase, and the residual stress stage. The bond between BFRP rebars and coral concrete increases with the increase of the bond length and diameter of BFRP rebars, but the average bond stress will decrease. Moreover, increasing the strength of coral concrete is effective to improve the bond performance of BFRP rebars. In this paper, the continuous bond slip model (Gao et al. in J Zhengzhou Univ 23:1–5, 2002) was used to represent the
$$\tau{\text{-}}s$$
constitutive relationship of BFRP rebars and coral concrete. The analysis show that the proposed model has a high degree of accuracy in representing
$$\tau{\text{-}}s$$
curve of BFRP rebars and coral concrete.
Tài liệu tham khảo
Altalmas, A., El Refai, A., & Abed, F. (2015). Bond degradation of basalt fiber-reinforced polymer (BFRP) bars exposed to accelerated aging conditions. Construction and Building Materials, 81, 162–171.
Angst, U., Elsener, B., Larsen, C. K., et al. (2009). Critical chloride content in reinforced concrete a review. Cement and Concrete Research, 39(12), 1122–1138.
Antonietta Aiello, M., Leone, M., & Pecce, M. (2007). Bond performances of FRP rebars-reinforced concrete. Journal of Materials in Civil Engineering., 19(3), 205–213.
Chinese Standard. (2002). Technical specification for lightweight aggregate concrete: JGJ 51-2002. Beijing: China Architecture & Building Press.
Chinese Standard. (2012). Standard for test method of concrete structures: GB/T 50152-2012. Construction and Building Materials, 18(2004), 491–503.
Cosenza, E., Manfredi, G., & Realfonzo, R. (1996). Bond characteristics and anchorage length of FRP rebars. In M. M. EL-Badry (Ed.), Advanced Composite Materials in Bridges and Structures and International Conference (pp. 909–916). Montreal: Canadian Society for Civil Engineering.
Cosenza, E., Manfredi, G., & Realfonzo, R. (1997). Behavior and modeling of bond of FRP rebars to concrete. Journal of Composites for Construction, 1(2), 40–51.
Dong, Z., Wu, G., Xu, B., et al. (2016). Bond durability of BFRP bars embedded in concrete under seawater conditions and the long-term bond strength prediction. Materials and Design, 92, 552–562.
Eligehausen, R., Popov, E. P. & Bertero, V. V. (1983). Local bond stress-slip relationships of deformed bars under generalized excogitations. Report no. 83/23, EERC (pp. 162–169) Berkely: University of California.
Gao, D., & Benmokrane, B. (2000). Bonding mechanism and calculating method for embedded length of fiber reinforced polymer rebars in concrete. Journal of Hydraulic Engineering., 11, 70–78.
Gao, D., Li, C. H. & Li, S., et al. (2009). Experimental research on bond-slip performance of GFRP rebar with concrete. In: Proceedings of the 6th national FRP academic exchange meeting. Chinese Society of Civil Engineering, National Committee of FRP and Engineering Applications: Chinese Society of Civil Engineering (pp. 107–112).
Gao, D., Xie, J., & Li, C. (2002). Basic problems of bonding properties of fiber polymer reinforced concrete. Journal of Zhengzhou University., 23(1), 1–5.
Gooranorimi, O., Suaris, W., & Nanni, A. (2017). A model for the bond-slip of a GFRP bar in concrete. Engineering Structures, 146, 34–42.
Guo, H. (2006) Experimental study and theoretical analysis on bond and anchorage properties of FRP bars concrete (Master’s thesis). Southeast University.
Ko, H., Matthys, S., Palmieri, A., & Sato, Y. (2014). Development of a simplified bond stress-slip model for bonded FRP-concrete interfaces. Construction and Building Materials, 68, 142–157.
Lyu, B., Wang, A., et al. (2019). Coral aggregate concrete: Numerical description of physical, chemical and morphological properties of coral aggregate. Cement and Concrete Composites, 100(7), 25–34.
Malvar, L. J. (1995). Tensile and pond properties of GFRP reinforcing bars. ACI Materials Journal, 92(3), 54–59.
Micelli, F., & Nanni, A. (2004). Durability of FRP rods for concrete structures. Construction and Building materials., 18, 491–503.
Okelo, R., & Yuan, R. L. (2005). Bond strength of fiber reinforced polymer rebars in normal strength concrete. Journal of Composites for Construction, 9, 203–213.
Pilakoutas, K., & Achillides, Z. (2004). Bond behavior of fiber reinforced polymer bars under direct pull out conditions. Journal of Composites for Construction, 8(2), 173–181.
Sharaky, I. A., Torres, L., Baena, M., & Mias, C. (2013). An experimental study of different factors affecting the bond of NSM FRP bars in concrete. Composite Structures, 99, 350–365.
Song, H., Lee, C., & Ann, K. (2008). Factors influencing chloride transport in concrete structures exposed to marine environments. Cement & Concrete Composites, 30(2), 113–121.
Tighiouart, B., Benmokrane, B., & Gao, D. (1998). Investigation of bond in concrete member with fibre reinforced polymer (FRP) bars. Construction and Building Materials, 12(8), 453–462.
Vilanova, M., Baena, L. Torres, & Barris, C. (2015). Experimental study of bond-slip of GFRP bars in concrete under sustained loads. Composites: Part B, 74, 42–52.
Wang, L., & Fan, L. (2015). Strength characteristic and failure pattern analysis on coral debris concrete. China Concrete and Cement Products, 1, 1–4.
Wang, L., Li, W., Chen, S. H., et al. (2018a). Effects of sea water soaking on the bonding properties of FRP bars-coral concrete. Journal of Composite Materials, 35, 3458–3465.
Wang, L., Mao, Y., Li, W., et al. (2018b). Experimental research on bond performance between GFRP bars and the coral concrete. Journal of Building Materials, 21, 286–292.
Wang, L., Mao, Y., Lv, H., et al. (2018c). Bond properties between FRP bars and coral concrete under seawater conditions at 30, 60, and 80°. Construction and Building Materials, 162, 442–449.
Wang, L., Zhao, Y., & Lu, H. (2012). Prospect on the properties and application situation of coral aggregate concrete. Concrete, 2, 99–113.
Wu, F. (2009). The experimental research on bond behavior between BFRP rebars and the concrete (Master’s thesis). Liaoning: Dalian University of Technology.
Xue, W., Zheng, Q., et al. (2007). Sand deformation GFRP bond performance study. Civil Engineering Journal., 40(12), 59–68.
Yang, S. H., Yang, C. H., et al. (2018). Study on bond performance between FRP bars and seawater coral aggregate concrete. Construction and Building Materials, 173, 272–288.
Yu, H. (2006). Physical and mechanical properties of coral sand in the Nansha islands. Marine Science Bulletin-Beijing Then Tianjin-English Edition, 8(2), 31.
Zhang, H. (2014). Study on strategic value assessment of Nansha islands (Master’s thesis). Nanjing University.
Zhao, Y., Han, C., Zhang, S., et al. (2011). Experimental study on the compression age strength of seawater coral concrete. Concrete, 2, 43–45.
Zhou, Y., Fan, Z., Du, J., et al. (2015). Bond behavior of FRP-to-concrete interface under sulfate attack: An experimental study and modeling of bond degradation. Construction and Building Materials, 85, 9–21.