Title:
Effect of Geometry and Aggregate on
the Reliability of the Pullout Test
Author(s):
William C. Stone and Bruce J. Giza
Publication:
Concrete International
Volume:
7
Issue:
2
Appears on pages(s):
27-36
Keywords:
aggregate size; aggregates; concretes;
embedment; mortars (material); nondestructive tests;
pullout tests; reliability; strength; test equipment.
DOI:
Date:
2/1/1985
Abstract:
A series of tests were performed to investigate the effect of changes in the geometry of the test apparatus and the effect of various concrete aggregate properties on the reliability of the pullout test. Key geometric variables included the apex angle and the depth of embedment of the 1 in. (25 mm) insert. Also investigated were the effects on reliability of nominal maximum aggregate size and the type of aggregate. The results indicate that for a fixed value of cylinder compressive strength, the scatter in the pullout ultimate load decreased nonlinearly with increasing apex angles and with decreasing depth of embedment. The presence of aggregate raises the scatter in the ultimate load and also raises the average ultimate pullout load. However, there appears to be no significant difference in scatter, or in the mean ultimate load among the aggregate sizes tested. The four aggregate types showed no effect on the reliability of the test.*