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
DOI:
10.14359/8102
Date:
11/1/1959
Abstract:
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.