Multi-scale mechanical performance of high strength-high ductility concrete

A new fiber-reinforced cement-based composite, called High Strength-High Ductility Concrete (HSHDC) with unparalleled combination of compressive strength (>150 MPa) and tensile ductility (>3 %), has been recently developed. Due to such unique combination of properties, the specific energies of HSHDC under tension and compression at both pseudo-static and high strain rates are extremely high. The design of this engineered material is based on the fundamental principles of micromechanics which focus on the synchronous functioning of the fiber, the cementitious matrix, and their interface to achieve the desired material properties for a given structural application. For such micromechanics-based design to succeed, the material has been researched at several length scales ranging from micro-scale fiber/matrix interactions to structural-scale impact resistance of HSHDC slabs. This paper summarizes the mechanical properties of HSHDC at various length scales to facilitate further development of this material and explore its potential for use in enhancing structural impact and blast resistance.