Combined Compression-Shear Experiments on Mortar-Aggregate Interfaces

by T. Stankowski, Univ of Colorado, United States,
S. Sture, Univ of Colorado, United States,
K. Runesson, Univ of Colorado, United States,

Document Type: Proceeding Paper

Part of: Serviceability and Durability of Construction Materials


Material interfaces between matrix and aggregate particles in cementitious composites such as concrete are considered to be a very important component of the material microstructure, which determine initiation of failure as well as dominant failure modes. Analysis of progressive failure in such composites requires therefore a realistic description of the interaction of the constituents at their interfaces accounting for fundamental contact properties such as adhesion, debonding, and mobilized friction as well as realistic dilatancy characteristics. This paper discusses experimental work on mortar aggregate interfaces currently under progress in an effort to quantify the constitutive interface properties in terms of initial and residual strength, stiffness and fracture energy release in tension as well as in shear.

Subject Headings: Progressive collapse | Compression | Aggregates | Compression tests | Material tests | Shear strength | Ultimate strength | Failure analysis

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