Influence of steel corrosion to flexural behavior of coral aggregate concrete beam

Abstract

To study the flexural behavior and calculation model, 8 coral aggregate concrete (CAC) beams with different types of steel were designed. The flexural behavior of CAC beam was tested. The failure mode, bearing capacity, the maximum crack width (w_s) and average crack spacing (l_m) were studied. A calculation model for the bearing capacity of CAC beam was proposed. The results indicated that with the steel strength increased, the cracking moment (M_cr) and ultimate moment (M_u) of CAC beam increased, and the development of the w_s gradually slowed, which effectively inhibited the formation of cracks and improved the flexural behavior of CAC beam. For CAC structures in the ocean engineering, it is recommended to use organic new coated steel to extend its effective service life. In addition, considering the influence of steel corrosion, a calculation model for the M_cr, M_u, l_m and w_s of CAC beam was established.

References

[1] TangL-ping. Engineering expression of the ClinConc model for prediction of free and total chloride ingress in submerged marine concrete [J]. Cement and Concrete Research, 2008, 38: 1092-1097

[2] LuC-h, CuiZ-w, LiuR-g, LiuQ-dong. Chloride diffusivity in flexural cracked Portland cement concrete and fly ash concrete beams [J]. Journal of Central South University, 2014, 21(9): 3682-3691

[3] DaB, YuH-f, MaH-y, TanY-s, MiR-j, DouX-mei. Chloride diffusion study of coral concrete in a marine environment [J]. Construction and Building Materials, 2016, 123: 47-58

[4] DaB, YuH-f, MaH-y, WuZ-yu. Reinforcement corrosion research based on electrochemical impedance spectroscopy for coral aggregate seawater concrete in a seawater immersion environment [J]. Journal of Testing and Evaluation, 2020, 48: 1537-1553

[5] DaB, YuH-f, MaH-y, WuZ-yu. Research on compression behavior of coral aggregate reinforced concrete columns under large eccentric compression loading [J]. Ocean Engineering, 2018, 155: 251-260

[6] Al-OstaM A, IsaM N, BaluchM H, RahmanM K. Flexural behavior of reinforced concrete beams strengthened with ultra-high performance fiber reinforced concrete [J]. Construction and Building Materials, 2017, 134: 279-296

[7] YuY-l, YinS-p, NaM-wang. Bending performance of TRC-strengthened RC beams with secondary load under chloride erosion [J]. Journal of Central South University, 2019, 26(1): 196-206

[8] RickA E. Coral concrete at bikini atoll [J]. Concrete International, 1991, 13(1): 19-24

[9] WattanachaiP, OtsukiN, SaitoT, NishidaT. A study on chloride ion diffusivity of porous aggregate concretes and improvement method [J]. Doboku Gakkai Ronbunshuu E, 2009, 65(1): 30-44

[10] KakooeiS, AkilH M, DolatiA, RouhiJ. The corrosion investigation of rebar embedded in the fibers reinforced concrete [J]. Construction and Building Materials, 2012, 35: 564-570

[11] ZhangWenExperimental study on reinforced coral aggregate concrete component [D], 1995, Nanjing, Hohai University

[12] WangF, ZhaX-xiong. Experimental and theoretical study on coral concrete filled steel tube [J]. Journal of Building Structures, 2013, 34(S1): 288-293

[13] JinY-dongResearch on short- and long-term mechanical properties of BFRP bar reinforced marines and concrete beams [D], 2016, Nanjing, Southeast University

[14] DaB, YuH-f, MaH-y, ZhangY-d, ZhuH-w, YuQ, YeH-m, JingX-shuang. Factors influencing durability of coral concrete structure in South China Sea [J]. Journal of the Chinese Ceramic Society, 2016, 44(2): 254-261

[15] YuH-f, DaB, MaH-y, ZhuH-w, YuQ, YeH-m, JingX-shuang. Durability of concrete structures in tropical atoll environment [J]. Ocean Engineering, 2017, 135: 1-7

[16] MaH-y, DaB, YuH-f, WuZ-yu. Research on flexural behavior of coral aggregate reinforced concrete beams [J]. China Ocean Engineering, 2018, 32(5): 593-604

[17] DaB, YuH-f, MaH-y, TanY-s, MiR-j, DouX-mei. Experimental investigation of whole stress-strain curves of coral concrete [J]. Construction and Building Materials, 2016, 122: 81-89

[18] YiW-j, KunnathS K, SunX-d, ShiC-j, TangF-jian. Fatigue behavior of reinforced concrete beams with corroded steel reinforcement [J]. ACI Structural Journal, 2010, 107: 526-533

[19] OuY-c, ChenH-heng. Cyclic behavior of reinforced concrete beams with corroded transverse steel reinforcement [J]. Journal of Structural Engineering, 2014, 140(9): 1629-1635

[20] ZhangW-p, ZhouB-b, GuX-l, DaiH-chao. Probability distribution model for cross-sectional area of corroded reinforcing steel bars [J]. Journal of Materials in Civil Engineering, 2014, 26: 822-832

[21] YuanY-s, JiaF-p, CaiYue. The structural behavior deterioration model for corroded reinforced concrete beams [J]. China Civil Engineering Journal, 2001, 34(3): 47-52

[22] DaB, YuH-f, MaH-y, ZhuH-w, WuZ-y, MeiQ-quan. Influence of concrete strength grade to the shear behavior of coral aggregate reinforced concrete beam [J]. Scientia Sinica Technologica, 2019, 49(2): 212-222