Behaviour of green ultra-high-performance concrete beams with corrosion resistant alloy steel (MMFX) bars
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Behaviour of green ultra‑high‑performance concrete beams with corrosion resistant alloy steel (MMFX) bars Ibrahim M. Metwally1 · Mohamed Ghannam2 Received: 4 January 2020 / Accepted: 30 March 2020 © Springer Nature Switzerland AG 2020
Abstract The aim of this study is to investigate the efficiency of using green ultra-high-performance concrete (GUHPC) with corrosion resistant alloy steel (MMFX) Bars in overcoming concrete cracking and steel corrosion, which will help in reducing inspection, maintenance, and repair works. To do so, a nonlinear finite element (FE) analysis was carried-out to model full-scale concrete beams which are often subjected to cracks during its service life time. The obtained results were compared with experimental data and the comparison was most satisfactory. In addition, a comparison was made between the proposed materials and traditional reinforced concrete in terms of crack widths, the intensity of cracks and service life period. The obtained results showed that using GUHPC and MMFX as a construction material in concrete structures provides high stiffness, high strength, enhanced service life and crack control beside its cost efficiency. Keywords Concrete cracks · Corrosion · Maintenance · Finite element · GUHPC and MMFX · Service life
1 Introduction Due to the consequences of steel corrosion, it becomes very important, it is very to provide an innovative solution for extending the service life of reinforced concrete (RC) structures. Poursaee [1] mentioned that there is a few research in the field of studying the extension of the service life of RC subject to carbonation and chloride-laden environments such as the use of ultra-high-performance concrete and noncorrosive reinforcement.
1.1 Ultra‑high performance concrete Ultra-high performance concrete (UHPC) is characterized by high ductility, durability, and mechanical properties [2]. UHPC mix design is usually composed of silica fume (SF), high cement content, quartz sand (QS), quartz powder (QP), and steel fibers [3]. UHPC is recognized for its
high compressive strength and resistance to corrosion [4]. The use of steel fibers improves the ductility and flexural capacity of UHPC. Its modulus of rupture may reach 15 MPa, compressive strength of more than 150 MPa, and elastic modulus of about 45 GPa, with minimum long-term creep [5]. Besides, UHPC has high resistance to carbonation, chloride penetration and freeze–thaw cycles with no visible damage [6]. Also it provides excellent protection for embedded steel reinforcement [7]. The main disadvantage of UHPC is its high expense compared to conventional concrete. One of the effective ways to overcome this problem is the utilization of green UHPC as used in this work. Recycling post-consumption glass was done many times in different countries without changing its chemical and physical properties significantly. High risk of breaking, high recycling costs, or color mixing is considered barriers that stand against recycling large quantities of glass. As glass is less environmentally frie
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