Strength of the Cement Aggregate Bond


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Title: Strength of the Cement Aggregate Bond

Author(s): K. M. Alexander

Publication: Journal Proceedings

Volume: 56

Issue: 11

Appears on pages(s): 377-390

Keywords: none

Date: 11/1/1959

Data from approximately 1000 determinations of port- land cement-aggregate bond strength and portland cement paste strength are presented and analyzed. It is shown that at early a e s lar the strength of th 8 e differences con exist between e bon formed between the same cement and different aggregates. No evidence was found of significant cement-aggregate bond strength differences between different samples of the same rock type. Cement aggregate bond strength decreases with increasing water- cement ratio and alkali content, and increases with in- creasing age. All cement-aggregate bond strengths ob- served here for sawn aggregate surfaces were consid- erably lower than the strength of the adjacent portland cement matrix at 7 and 28 days. On the basis of these data explanations are suggested for some aspects of the process of tensile failure of plain concrete.