Abstract
The Quasi-static mechanical properties of hybrid fiber (steel fiber and Polyvinyl alcohol (PVA) fiber) reinforced cementitious composites (HFRCC(SP)) were investigated by compressive and tensile experiments. The compressive strength, peak strain, elastic modulus and tensile strength are studied as compared with that of engineered cementitious composite (ECC). Study results indicate that steel fibers can improve the compressive and tensile strength of HFRCC(SP) but the peak strain of HFRCC(SP) decreases. The formulas modified based on codes are proposed to calculate compressive peak strain, elastic modulus and tensile strength. The relationship between tensile strain at peak load and tensile strength of HFRCC with different volume fractions of polyethylene fiber and steel fiber were studied and the tensile stress-strain relation was presented. The parameters k1 and k2 of constitutive formulas for fiber reinforced high strength concrete presented by Mansur are modified to describe the stress-strain curve of HFRCC(SP), the modified formulas show good agreement with the experimental results.
Highlights
Cement-based materials are always suffer the compressive loading for its disadvantages, such as low tensile strength and highly brittle
The researches show that different kinds of fiber can reinforce the certain mechanical properties of Fiber reinforced cementitious composites (FRCC), adding high modulus fibers like steel fibers or carbon fibers can improve tensile strength but show low toughness [1] and adding low modulus fibers like polyvinyl alcohol (PVA) fiber or Polypropylene (PE) fiber can improve toughness but show low tensile strength [2]
The compressive strength, peak strain and elastic modulus are three main values that depict the mechanical properties of HFRCC(SP) under compressive loading
Summary
Cement-based materials are always suffer the compressive loading for its disadvantages, such as low tensile strength and highly brittle. Fiber reinforced cementitious composites (FRCC) process more advantages than concrete such as high compressive strength, high tensile strength and high toughness. The researches show that different kinds of fiber can reinforce the certain mechanical properties of FRCC, adding high modulus fibers like steel fibers or carbon fibers can improve tensile strength but show low toughness [1] and adding low modulus fibers like polyvinyl alcohol (PVA) fiber or Polypropylene (PE) fiber can improve toughness but show low tensile strength [2]. Static mechanical properties of HFRCC that contains 0.75% steel and 1.25% PVA fibers are studied. The tensile and compressive constitutive formulas of HFRCC are presented
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