J. Eng. Technol. Sci., Vol. 53, No. 2, 2021, 210209 Received 13 December 2019, Revised February 17 th , 2021, Accepted for publication March 15 th , 2021. Copyright ©2021 Published by ITB Institute for Research and Community Services, ISSN: 2337-5779, DOI: 10.5614/j.eng.technol.sci.2021.53.2.9 Tension Stiffening Behavior of Polypropylene Fiber- Reinforced Concrete Tension Members Aris Aryanto * & Berto Juergen Winata Department of Civil Engineering, Institut Teknologi Bandung, Jalan Ganesha No. 10 Bandung 40132, Indonesia *E-mail: arisaryanto@ftsl.itb.ac.id Highlights:  The addition of polypropylene fiber into RC members can improve tension stiffening and the optimum fiber content can be known.  The tension stiffening bond factor was identified for various fiber contents, which can be used for the prediction of tension stiffening and cracking behavior of such structures.  The corrosion effect on tension stiffening and cracking behavior in PFRC members was investigated. Abstract. This paper focuses on comparing the behavior of RC tension members with and without the addition of polypropylene fibers at various corrosion levels. Eight cylindrical tensile specimens were tested to evaluate their tension-stiffening and cracking behavior. The content of polypropylene fiber added into the concrete mix was the main variable (0.25%, 0.50%, 0.75%, and 1.0% of total volume). The corrosion level was varied from slight (5%), medium (10%) to severe (30%), and like the other variables, applied only to 1.0% polypropylene fiber-reinforced concrete (PFRC) specimens. The test results showed that the fiber addition significantly increased the tension-stiffening effect but was largely unable to reduce the effect of bond degradation caused by corrosion. Moreover, the addition of polypropylene fibers was able to improve the cracking behavior in terms of crack propagation, as shown by smaller crack spacing compared to the specimen without fiber addition at the same corrosion level. Keywords: corrosion; cracking; fiber-reinforced concrete; polypropylene fibers; tension stiffening. 1 Introduction For reinforced concrete (RC) structures that are exposed directly to the marine environment, such as jetties and bridges, corrosion of the reinforcements is one of the leading causes of structural degradation [1] induced by chloride penetration. Corrosion products will cause expansion around the steel bar perimeter, generate splitting stress in the concrete, and initiate cracking or even spalling of the concrete cover, resulting in the loss of reinforcing steel area and