Bending performance of TRC-strengthened RC beams with secondary load under chloride erosion

Abstract

Textile reinforced concrete (TRC) has good bearing capacity, crack resistance and corrosion resistance and it is suitable for repairing and reinforcing concrete structures in harsh marine environments. The four-point bending method was used to analyze the influence of the salt concentration, the damage degree and the coupled effect of the environment and load on the bending performance of TRC-strengthened beams with a secondary load. The results showed that as the salt concentration increased, the crack width and mid-span deflection of the beam quickly increased, and its bearing capacity decreased. As the damage degree increased, the early-stage crack development and mid-span deflection of the beam were less affected and the ultimate bearing capacity significantly decreased. In addition, the coupled effect of the environment and load on the beams with a secondary load was significant. As the sustained load increased, the ultimate bearing capacity of the strengthened beam decreased, and cracks developed faster in the later stage. In addition, the mid-span deflection of the beam decreased at the same load level because of the influence of the initial deflection due to the sustained load corrosion.

Keywords

textile reinforced concrete / bending performance / secondary load / sustained load corrosion

References

[1] LuC-h, YuanG, CuiZ-w, LiuR-gui. Experimental analysis of chloride penetration into concrete subjected to drying–wetting cycles [J]. Journal of Materials in Civil Engineering, 2015, 27(12): 77-86

[2] WuL-j, ZhouY-j, KouX-j, JiangMeng. Reliability-based service life prediction of existing concrete structures under marine environment [J]. Journal of Central South University, 2015, 22(9): 3608-3614

[3] MesticouZ, BuiL, JunesA, LarbiA S. Experimental investigation of tensile fatigue behaviour of textilereinforced concrete (TRC): Effect of fatigue load and strain rate [J]. Composite Structures, 2017, 160: 1136-1146

[4] LarbiA S, ContamineR, FerrierE, HamelinP. Shear strengthening of RC beams with textile reinforced concrete (TRC) plate [J]. Construction & Building Materials, 2010, 24(10): 1928-1936

[5] ContamineR, LarbiA S. Development of a textile reinforced concrete (TRC) to retrofit reinforced concrete structures [J]. European Journal of Environmental & Civil Engineering, 2015, 20(6): 1-17

[6] YinS-p, WangB, WangF, XuS-lang. Bond investigation of hybrid textile with self-compacting fine-grain concrete [J]. Journal of Industrial Textiles, 2017, 46(12): 1616-1632

[7] XuS-l, ShenL-h, WangJ-yang. The high-temperature resistance performance of TRC thin-plates with different cementitious materials: Experimental study [J]. Construction & Building Materials, 2016, 115: 506-519

[8] MechtcherineV. Novel cement-based composites for the strengthening and repair of concrete structures [J]. Construction & Building Materials, 2013, 41(41): 365-373

[9] ColomboI G, ColomboM, PriscoM D. Bending behaviour of textile reinforced concrete sandwich beams [J]. Construction & Building Materials, 2015, 95: 675-685

[10] ContamineR, LarbiA S, HamelinP. Identifying the contributing mechanisms of textile reinforced concrete (TRC) in the case of shear repairing damaged and reinforced concrete beams [J]. Engineering Structures, 2013, 46: 447-458

[11] VerbruggenS, TysmansT, WastielsJ. Bending crack behaviour of plain concrete beams externally reinforced with TRC [J]. Materials and Structures, 2016, 49(12): 1-12

[12] ShengJ, YinS-p, WangF, YangYang. Experimental study on the fatigue behaviour of RC beams strengthened with TRC after sustained load corrosion [J]. Construction & Building Materials, 2017, 131: 713-720

[13] YinS-p, NaM-w, YuY-l, WuJian. Research on the flexural performance of RC beams strengthened with TRC under the coupling action of load and marine environment [J]. Construction & Building Materials, 2017, 132: 251-261

[14] ZhaoJing. Study on the bending behavior of RC beams strengthened with BFRP considering the secondary loading [D]. Hangzhou: Zhejiang University of Technology, 2012

[15] ShangS-p, ZengL-h, DaiRui. Experimental study on flexural behavior of reinforced concrete beams strengthened with ferrocement under secondary load [J]. Journal of Building Structures, 2015, 26(5): 74-80

[16] YinS-p, YangY, YeTao. Experimental research on seismic behavior of reinforced concrete columns strengthened with TRC under corrosion environment [J]. Journal of Structural Engineering, ASCE, 2017, 143(5): 04016231

[17] YinS-p, ShengJ, WangX-x, LiS-guo. Experimental investigations of the bending fatigue performance of TRC-strengthened RC beams in conventional and aggressive chlorate environments [J]. Journal of Composites for Construction, 2016, 20204015051

[18] YinS-p, XuS-l, WangFei. Investigation on the flexural behavior of concrete members reinforced with epoxy resin-impregnated textiles [J]. Materials and Structures, 2015, 4812153-166

[19] YinS-p, XuS-l, LiH-dong. Improved mechanical properties of textile reinforced concrete thin plate [J]. Journal of Wuhan University of Technology-Mater Sci Ed, 2013, 28(1): 92-98

[20] YinS-p, PengC, JinZ-yu. Research on mechanical properties of axial compressive concrete columns strengthened with TRC under a conventional and chloride wet-dry cycle environment [J]. Journal of Composites for Construction, ASCE, 2017, 21(1): 04016061

[21] ZhengR-mei. Influence of salt on the composition and structure of interfacial transition zone in concrete [D]. Hefei: Hefei University of Technology, 2009

[22] WeiJ, ZhangM, DongR-z, LiP, YuZ-wu. Experimental research on the failure mode of concrete beam due to steel corrosion [J]. Journal of Hunan University (Natural Sciences), 2013, 401015-21