Study of the Mechanical Behavior of a Reactive Powder Concrete Containing Fibers
The reactive powder concretes (RPC) are new concretes with a particle diameter of not more than 600 μm and very high compressive, tensile strengths and an excellent durability. In this experimental investigation we study this new generation of micro-concr
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of Biskra, BP 145 RP, Biskra 07000, Algeria [email protected] 2 Institute of Technical Urban Management, Geomaterials Development Laboratory, University of M’sila, M’sila, Algeria
Abstract. The reactive powder concretes (RPC) are new concretes with a particle diameter of not more than 600 μm and very high compressive, tensile strengths and an excellent durability. In this experimental investigation we study this new generation of micro-concretes, in obtaining high initial and final mechanical performances using local materials. The Portland cement, materials rich in silica (slag, silica fume and quartz) and new steel fibers’ aspect ratios has been reinforced the concrete RPC. Specimens’ preparation, curing regimes and testing procedures to evaluate the effect of heat treatment, steel fiber percentage compressive strength, flexural strength, deformability and modulus of elasticity of RPCFs were discussed. A compressive strength of 134 MPa, indirect tensile strength of 2.7 MPa, heting temperature of 90 °C, 2.5% steel fiber have been achieved for reinforced RPC contains 945 kg/m3 cement content and silica fume content 30% of cement weight. Also, the relationship between the relative value and the modulus of elasticity developed for a fiber-reinforced reactive concrete is greater than that of the unbound fiber. By eliminating the granular phase in the RPC and the abundance of dune sand (southern Algeria) and granulated slag, the use of RPC in Algeria with local materials meets economic and ecological requirements. Keywords: Reactive powder concrete · Mechanical strength · Fibers · Deformability · Elasticity modulus
1 Introduction The high-performance fibered concretes HPFC are very compact and high-strength materials. Due to its excellent properties, UHPC has been widely used as an overlay to repair existing concrete structures, improving its mechanical and durability properties for lesser maintenance work (Azmee and Shafiq 2018). UHPC are cementitious matrix materials with compressive strengths greater than 150 MPa. These materials are supplemented with metal fibers (UHPCF) in order to obtain a ductile behavior in tension. They are also characterized by their strong binding and special selection, the aggregates of which © Springer Nature Switzerland AG 2020 B. Safi et al. (Eds.): ISMSD 2019, Proceedings of the 4th International Symposium on Materials and Sustainable Development, pp. 71–82, 2020. https://doi.org/10.1007/978-3-030-43211-9_7
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are the subject from the point of view of their formulation Shin et al. (2017). Reactive powder concrete (RPC) is a type of UHPC is distinguished by its compressive strengths ranging between 200 MPA and 800 MPA after pressure and heat treatment, depending on the mixture proportions and the temperature Ye et al. (2018). Also, Ultra-High Performance Fiber Reinforced Concretes (UHPFRC) are cementitious composites with outstanding material properties they have very high strengths (compressive strength > 150 MPa, tensile strength > 8 MPa) Somasekharai
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