Investigation on concrete dynamic bending intensity and limit flexural intensity

The rate sensitivity of concrete-like brittle materials results mainly from their inhomogeneity, which leads to their different paths of crack development at different load rates and accounts for their different dynamic flexural strengths. On the basis of the above theoretical analysis, this paper presents the algebraic expression of the dynamic flexural strength, which consists of the weighted average of the flexural strength of mortar and aggregate and the inertia term, predicts the limit flexural intensity of concrete materials under different impact loads and, finally, investigates their crack paths and intensity variations at different loading rates by the three-point bending beam test with a special rhombus aggregate.