Effects of recycled aggregate combinations and recycled powder contents on fracture behavior of fully recycled aggregate concrete

Mechanical properties of fibre reinforced seawater sea-sand recycled aggregate concrete under axial compression

As a popular cementitious material in civil engineering in recent years, ultra-high-performance concrete (UHPC) has been used in harsh working conditions for its superior mechanical properties and durability. However, cracking in UHPC is a significant threat to its durability. Thus, studying the fracture properties of UHPC for rational design of crack resistance is important. The aim of this study was to develop closed-form solutions of the size-independent tensile strength ( f t ) and fracture toughness ( K IC ) of UHPC. Three-point-bending tests were performed on 80 UHPC beams with different depths and initial crack lengths; the fracture behaviour was comprehensively analysed and a predictive model was proposed to determine f t and K IC . A characteristic microstructure parameter ( C ch ) and two discrete coefficients ( β and C ) were introduced to indicate material heterogeneity and discontinuity, respectively. C ch was determined as the average fibre spacing in this study. These coefficients also quantified the critical effective crack propagation length at the maximum fracture load ( F max ) and the characteristic crack length defined by the bulk toughness and strength properties. A linear relationship of F max with respect to f t and K IC was established; the size-independent f t and K IC were obtained after determining F max from three-point-bending tests. The effects of C ch , β , and C on the predicted f t and K IC values were analysed. Although both f t and K IC exhibited certain differences as C ch , β and C were simultaneously varied, the results were within the upper and lower limits of the f t and K IC values predicted by statistical analysis. • Fracture mechanism of UHPC was comprehensively analyzed and clarified. • Characteristic microstructure parameter was correlated to fiber characterization. • Critical crack propagation length at maximum load was discretized quantitatively. • Maximum load was linked to tensile strength and fracture toughness linearly. • Scatters in the predicted results were analyzed based on a statistical analysis. 

Closed-form solution for predicting tensile strength and fracture toughness of ultra-high-performance concrete

A predictive solution for fracture modeling of alkali-activated slag and fly ash blended sea sand concrete after exposure to elevated temperature

/pdf/applying-the-new-experimental-midpoint-concept-on-strain-13rgdule.pdf

Applying the new experimental midpoint concept on strain energy density for fracture assessment of composite materials

A closed-form fracture model to predict tensile strength and fracture toughness of alkali-activated slag and fly ash blended concrete made by sea sand and recycled coarse aggregate

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A closed-form fracture model to predict tensile strength and fracture toughness of alkali-activated slag and fly ash blended concrete made by sea sand and recycled coarse aggregate