Dynamic Mechanical Properties of Concrete Under High Strain Rates

Concrete subjected to high strain‐rate loading exhibits markedly different mechanical responses from those observed under quasi-static conditions. At elevated loading rates, both compressive and tensile strengths increase, ductility often improves and failure modes evolve from single‐crack propagation to distributed microcracking and fragmentation. Key parameters such as the dynamic increase factor (DIF), energy absorption capacity and strain‐rate–dependent elastic modulus quantify these changes. Experimental techniques, most notably the split Hopkinson pressure bar (SHPB), have enabled precise characterisation of stress–strain responses across a broad range of strain rates. Advances in material design—incorporating steel fibres, hybrid fibres, nanomaterials or recycled aggregates—have further expanded the ability to tailor dynamic performance. Numerical constitutive models now integrate rate sensitivity and mesoscale heterogeneity to predict the dynamic strength, failure patterns and energy dissipation of conventional, ultra-high-performance and engineered concretes under blast, impact or seismic loading. Such understanding underpins the design of resilient infrastructure, protective structures and civil-defence applications worldwide.

Research from Nature Portfolio

Recent studies on nano-modified concretes have demonstrated that incorporation of nano-CaCO₃ and nano-SiO₂ exerts contrasting effects on static and dynamic behaviour. Nano-CaCO₃ enhances packing density and refines pore structure, yielding higher dynamic compressive strength, peak strain and energy absorption while reducing the dynamic increase factor. Conversely, nano-SiO₂ can introduce weak zones that degrade impact performance. Co-doping with optimised proportions balances these effects and improves both static and dynamic properties. Earlier work on dynamic splitting tests of concrete and mortar discs revealed that tensile strength increases significantly with strain rate, accompanied by a shift from single to multiple cracking and eventual fragmentation. A practical linear relation between DIF and strain rate was proposed, offering engineers a straightforward tool for estimating dynamic tensile capacity in design applications.

Dynamic Mechanical Properties of Concrete Under High Strain Rates publication trend

The graph below shows the total number of articles in dynamic mechanical properties of concrete under high strain rates across all publications each year (not limited to Nature Index journals).

Technical terms

Strain rate: The rate of deformation per unit time, expressed in s⁻¹, critically influencing concrete’s strength and failure mode under dynamic loading.

Dynamic increase factor (DIF): Ratio of dynamic strength to quasi-static strength, used to quantify rate sensitivity.

Split Hopkinson pressure bar (SHPB): Experimental apparatus for generating controlled high-strain-rate compression or tension pulses in small concrete specimens.

Interfacial transition zone (ITZ): The micro-region surrounding aggregate particles, whose properties govern macroscopic mechanical behaviour under impact.

Energy absorption: The work per unit volume absorbed by concrete during deformation and failure, indicating toughness under dynamic loads.

References

1. Strain-rate sensitivity of cement composites: Insights from field's metal nano-inclusions. Cement and Concrete Research (2023).
2. Research progress on the dynamic compressive properties of ultra-high performance concrete under high strain rates. Cement and Concrete Composites (2021).
3. Dynamic compressive behavior of recycled aggregate concrete based on split Hopkinson pressure bar tests. Latin American Journal of Solids and Structures (2014).
4. Impact of micromechanics on dynamic compressive behavior of ultra-high performance concrete containing limestone powder. Composites Part B Engineering (2022).
5. Strain Rate Dependent Behavior and Modeling for Compression Response of Hybrid Fiber Reinforced Concrete. Latin American Journal of Solids and Structures (2016).
6. Quasi-static and dynamic experimental studies on the tensile strength and failure pattern of concrete and mortar discs. Scientific Reports (2017).
7. Effect of nano-SiO2 and nano-CaCO3 on the static and dynamic properties of concrete. Scientific Reports (2022).