Cement and Concrete Composites · 2021 · 155 citations · 136 references
Natural SciencesMaterials EngineeringMaterials ScienceMechanical Behavior Of MaterialsStructural EngineeringStructural MaterialsConcrete ConstructionConcrete MaterialsDynamic Structural ResponseFiber-reinforced CompositesStress-strain BehaviorStructural Response AnalysisCompressive Response At High Strain RatesCompressive StrengthDynamic Constitutive ModelingDynamic StrengthDynamic Structural FailureMechanical PerformanceRate-dependent Compressive PropertiesStress-strain Analysis
Ultra‑high performance concrete (UHPC) is prized for its superior mechanical performance, and the split Hopkinson pressure bar (SHPB) is the standard tool for probing its dynamic compressive behavior, yet a comprehensive synthesis of SHPB‑based studies remains lacking. The paper aims to provide a systematic review of UHPC dynamic compressive properties measured by SHPB to guide future research. The review surveys SHPB methodology, evaluates key dynamic metrics (strength, strain, modulus), examines influences of fiber content, temperature, aggregate, nanomaterials, size, and loading rate, and summarizes models for dynamic increase factor, energy absorption, constitutive behavior, and failure patterns. The authors propose prediction models for dynamic strength and energy absorption that incorporate strain rate and steel‑fiber volume, and introduce a new failure mechanism for UHPC across strain rates.
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.
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