Physical Incompatibility of Matrix and Aggregate in Concrete


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Title: Physical Incompatibility of Matrix and Aggregate in Concrete

Author(s): G. M. Smith

Publication: Journal Proceedings

Volume: 52

Issue: 3

Appears on pages(s): 791-798

Keywords: no keywords

Date: 3/1/1956

A theoretical analysis is made of the stresses that might result in a matrix surrounding a spherical body due to the thermal incompatibility of the matrix and the spherical body. The analysis indicates that the magnitude of the stresses depends upon the thermal expansion, Poisson’s ratio, modulus of elas-ticity, and size of the inclusion. Although the analysis is purely qualitative, it does show the complexity of the term thermal incompatibility, so frequently related to the durability of concrete subjected to freezing and thawing. Graphs are constructed to illustrate the effect of the various physical properties on the thermal stresses developed in a matrix. The matrix is considered to consist of cement paste or a mixture of paste, aggregate, and voids.