Abstract: Textile-reinforced concrete (TRC) possesses excellent bearing capacity and anticrack and corrosion-resistance abilities, which make it suitable for reinforcing concrete structures in harsh environments。 However, the seismic performance of TRC-strengthened concrete columns under chloride corrosion remains unknown。 Therefore, a corrosion test was conducted by the electrochemical method on seven steel- reinforced concrete (RC) columns; of these columns, two were used as the control columns, and the other five were strengthened with TRC。 The corroded specimens were tested by low cyclic loading in this study, and the effects of the corrosion ratio and different reinforcement methods on the seismic behavior were studied。 The results show that TRC reinforcement can effectively reduce the effect of chloride ions on steel corrosion and delay the development of cracks in concrete。 The hysteresis curve, initial stiffness, and deformation capacity of the columns strengthened with TRC are superior to those of unstrengthened columns in the same corrosion environment。 The displacement ductility factor of the strengthened columns decreases with the increasing corrosion ratio in different corrosion environments, while the constraint efficiency of the TRC increases。 The method of reinforcement before corrosion is better than that of corrosion before reinforcement in terms of the ductility and stiffness degradation。 The test shows that TRC reinforcement can effectively improve the seismic capability of RC columns in a corrosion environment。 DOI: 10。1061/(ASCE)ST。1943-541X。0001713。 © 2016 American Society of Civil Engineers。73740

Author keywords: Textile reinforced concrete (TRC); Low cyclic loading test; Seismic behavior; Corrosion environment; Seismic effects。

Introduction

Civil engineering structures such as coastal buildings, bridges, and ports often suffer from stress corrosion, chloride ion erosion, and the dry and wet alternating effects of a variety of severe physical and chemical erosion environments, which can damage the struc- ture, weaken the performance, and even cause failure (Biondini et al。 2014; Gjørv 2014)。 Therefore,  it  is  urgent  to strengthen and repair these structures to improve the mechanical properties of the structural members (Chaallal et al。 2006)。 To provide anti- corrosion protection to steel bars, using cement-based repair mate- rials is a new technique that is relatively economical and suitable (Bösche et al。 2008)。

1Associate Professor, State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China Univ。 of Mining and Technology, Jiangsu, Xuzhou 221116, China (corresponding author)。 E-mail: yinshiping7808@aliyun。com

2Master’s Degree Candidate, State Key Laboratory for  Geomechanics

and Deep Underground Engineering, School of Mechanics and Civil Engineering, China Univ。 of Mining and Technology, Xuzhou 221116, China。

3Master’s Degree Candidate, Jiangsu Key Laboratory of Environmental Impact  and Structural  Safety  in  Engineering, School  of Mechanics and

Civil Engineering, China Univ。 of Mining and Technology, Xuzhou 221116, China。

4Master’s Degree Candidate, Jiangsu Key Laboratory of Environmental

Impact and Structural Safety in Engineering, School of Mechanics and Civil Engineering, China Univ。 of Mining and Technology, Xuzhou 221116, China。

Note。 This manuscript was submitted on April 15, 2016; approved on October 4, 2016; published online on December 8, 2016。 Discussion period open until May 8, 2017; separate discussions must be submitted for indi- vidual papers。 This paper is part of the Journal of Structural Engineering,

© ASCE, ISSN  0733-9445。

Different solutions for the design of cement-based strengthening systems for concrete structures have been proposed。 Among these, textile-reinforced concrete (TRC) (Hegger et al。 2006; Hegger and Voss 2008; Bösche et al。 2008; Yin et al。 2014, 2015), textile- reinforced mortar (TRM) (Bournas et al。 2007, 2009; Al-Salloum et al。 2011; Abadel 2012; Koutas et al。 2014), basalt-reinforced mortar (BRM) (Ludovico et al。 2010), and fabric-reinforced cemen- titious matrix (FRCM) (Ombres and Verre 2015) have proven the effectiveness of cement-based composites for strengthening RC structures。 These systems are merely variations of the same core idea with typically minor differences。