Tensile Properties of Hybrid Fiber-Reinforced Reactive Powder Concrete After Exposure to Elevated Temperatures

Abstract

The paper presents a research project on the tensile properties of RPC mixed with both steel and polypropylene fibers after exposure to 20-900°C. The direct and the indirect tensile strength (in bending) were measured through tensile experiment on dog-bone specimens and bending experiment on 40 9 40 9 160 mm prisms. RPC microstructure was analyzed using scanning electron microscope. The results indicate that, steel fibers can significantly improve the tensile performance of hybrid fiberreinforced RPC, whereas polypropylene fibers have no obvious effect on the tensile performance. With increasing temperature, the flexural and axial tensile strength of hybrid fiber-reinforced RPC substantially decrease linearly, which attributes to the deteriorating microstructure. Based on the experimental results, equations are established to express the decay of the flexural and tensile strength with increasing temperature.

Effect of Fiber Hybridization on Durability Related Properties of Ultra-High Performance Concrete

“…The material is characterized by high strength, low absorbability, low water permeability and high freeze resistance, which results in high durability (Smarzewski and Barnat-Hunek 2013;Li and Liu 2016;Kang et al 2016). This material has a low porosity and might be filled with a gaseous phase or liquid phase.…”

A Review on Structural Behavior, Design, and Application of Ultra-High-Performance Fiber-Reinforced Concrete

“…Ultra-high-performance fiber-reinforced concrete (UHPFRC), which was developed in the mid-1990s, has attracted much attention from researchers and engineers for practical applications in architectural and civil structures, because of its excellent mechanical performance, i.e., compressive strength is greater than 150 MPa and a design value of tensile strength is 8 MPa (AFGC-SETRA 2002), durability, energy absorption capacity, and fatigue performance (Farhat et al 2007;Graybeal and Tanesi 2007;Yoo et al 2014c;Li and Liu 2016). In particular, its very high strength properties result in a significant decrease in the structural weight, i.e., the weight of UHPFRC structures is about 1/3 (or 1/2) of the weight of general reinforced concrete (RC) structures at identical external loads (Tam et al 2012).…”

Pull-Out Behaviour of Hooked End Steel Fibres Embedded in Ultra-high Performance Mortar with Various W/B Ratios

“…The efficiency of fibres in transferring applied stresses is greatly dependent on the fibre-matrix interface properties of fibre reinforced concrete (FRC) (Abdallah et al 2016;Dinh et al 2016;Lu et al 2016;Tadepalli et al 2015). Therefore, the bond-slip characteristics play a crucial role in controlling the tensile behaviour of FRC (Li and Liu 2016;Srikar et al 2016;Bentur et al 1995).…”