Abstract
The quasi-static and dynamic mechanical behaviours of the concrete reinforced by twisting ultra-high molecular weight polyethylene (UHMWPE) fibre bundles with different volume fractions have been investigated. It was indicated that the improved mixing methodology and fibre geometry guaranteed the uniform distribution of fibres in concrete matrix. The UHMWPE fibres significantly enhanced the splitting tensile strength and residual compressive strength of concrete. The discussions on the key property parameters showed that the UHMWPE fibre reinforced concrete behaved tougher than the plain concrete. Owing to the more uniform distribution of fibres and higher bonding strength at fibre/matrix interface, the UHMWPE fibre with improved geometry enhanced the quasi-static splitting tensile strength and compressive strength of concrete more significantly than the other fibres. The dynamic compression tests demonstrated that the UHMWPE fibre reinforced concrete had considerable strain rate dependency. The bonding between fibres and concrete matrix contributed to the strength enhancement under low strain-rate compression.
Highlights
RESUMEN: Impacto del refuerzo de fibra de polietileno de alto rendimiento torsionada en las características mecánicas del hormigón de alta resistencia
We develop the concrete reinforced by the twisting high-performance Ultra-high molecular weight polyethylene (UHMWPE) fibres with improved geometry
A Split Hopkinson Pressure Bar (SHPB) measurement setup was used for the dynamic compression test at strain rates of 140 s-1 to 255 s-1
Summary
RESUMEN: Impacto del refuerzo de fibra de polietileno de alto rendimiento torsionada en las características mecánicas del hormigón de alta resistencia. It is urgent to develop the concrete reinforced by high-performance fibres that possess good quasi-static mechanical properties and have excellent impact resistance. UHMWPE fibre is manufactured to be a kind of high-performance flexible fibre with high tensile strength, low density and stable performance. The UHMWPE fibres with high tensile strength are more likely to fail with pulling out rather than fibre fracture This type of flexible fibre is easy to be intertwined, leading to an uneven distribution and significant defect. The study on the dynamic compressive constitutive model of UHMWPE fibre reinforced concrete has not been reported, which may limits the applications of this high-performance fibre reinforced concrete. The study on the dynamic compressive response of the concrete reinforced by UHMWPE fibres is required
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