Title:
Variability of Pullout Tests and in
Place Concrete Strength
Author(s):
J. A. Bickley
Publication:
Concrete International
Volume:
4
Issue:
4
Appears on pages(s):
44-51
Keywords:
compressive strength; pullout tests; stan- dard deviation; statistical analysis; tests.
DOI:
Date:
4/1/1982
Abstract:
Briefly reviews the development of pullout testing. Test data from 18 construction sites, together with relevant correlation results, are analyzed. The data is examined in the perspective of a series of tests that attempts to determine the true in-test variation of pullout tests. The pullout test used is shown to have the same order of in-test variation as standard cylinders. Therefore, it is possible to measure the in-place strength of concrete and variation of its strength. From this, the minimum strength of concrete in a placement can be calculated by standard statistical methods with a high degree of confidence.*