Abstract
Ultra-high performance concrete (UHPC) has been accepted rapidly attributed to its superior mechanical performance and the split Hopkinson pressure bar (SHPB) is being widely utilized to evaluate the dynamic compressive properties of UHPC. Numerous studies have been performed on the dynamic behaviour of UHPC, however, a systematic summary and analysis on the dynamic compressive properties of UHPC tested by SHPB is still missing. The review starts by introducing the advantages, deficiencies and improvement methods of SHPB system. Dynamic compressive properties including dynamic compressive strength, peak strain, stress-strain relationship and dynamic elastic modulus are analyzed. The effects of steel fiber (content, type, orientations and hybrid), temperature condition, coarse aggregate, nanomaterials, size effect and loading rate on the dynamic characteristics of UHPC are comprehensively discussed. Dynamic increase factor, energy absorption characteristics and their models are summarized. Then, the dynamic constitutive model and the dynamic failure pattern are evaluated. Based on the analysis, prediction models of dynamic strength and energy absorption are proposed by considering the strain rate and volume of steel fiber, further, a new failure mechanism of UHPC under different strain rates is proposed. Finally, the topics requiring further study are highlighted. It is expected that this paper can provide references for prospective research on dynamic characteristics of UHPC.
Highlights
Ultra-high performance concrete (UHPC) often refers to advanced cement-based composite material with very high compressive strength, superior energy absorption capacity and excellent durability [1,2,3,4,5]
The results indicated that adding PP fiber can reduce the peak strength of RPC and the low elasticity modulus of PP fiber is accounted for this phenomenon, which obstructs its application in UHPC
The results revealed that when the content of nanomaterials increased from 1% to 3%, the dynamic compressive strength increased significantly, when it further increased from 3% to 5%, the dynamic compressive strength decreased
Summary
Ultra-high performance concrete (UHPC) often refers to advanced cement-based composite material with very high compressive strength, superior energy absorption capacity and excellent durability [1,2,3,4,5]. Steel fiber (content, types and orientations), aggregate, temperature condition all have significant effect on dynamic compressive properties. DIF, energy absorption capacity and dynamic constitutive models are important indicators in analysis and design of UHPC struc tures under impact loadings, and failure pattern mechanism of UHPC can benefit the comprehension of the relationship between indicators and the strain rate. A comprehension on the dynamic compressive properties including dynamic compressive strength, DIF, peak strain, stress-strain relationship, dynamic elastic modulus, energy absorption capacity, dynamic constitutive models and failure pattern of UHPC tested by SHPB are still missing. The effect factors such as strain rate, steel fiber (content, types, aspect ratio and hybrid), aggregate size, nano materials, size effect and temperature are observed systematically on the dynamic compressive characteristics, including dynamic compressive strength, peak strain, stress-strain curves and elastic modulus.
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