AGGREGATE BOND AND MODULUS OF ELASTICITY OF CONCRETE

The difference between the modulus of elasticity of aggregate and of h ardened cement paste is shown to influence the bond stress between the two materials and therefore die shape of the stress-strain relation. Better monolithic behavior of concrete, which is beneficial, for examp le, when temperature cycling is expected, is achieved when the differe nce between the moduli is reduced. A discussion of the behavior of hig h-strength concrete and of lightweight aggregate concrete gives a poin ter for the choice of mix ingredients.