Title:
Cores from High-Performance Concrete Beams
Author(s):
F. Michael Bartlett and James G. MacGregor
Publication:
Materials Journal
Volume:
91
Issue:
6
Appears on pages(s):
567-576
Keywords:
beams (supports); compressive strength; concrete cores; evaluation; high-strength concretes; standard deviation; tests; Materials Research
DOI:
10.14359/1377
Date:
11/1/1995
Abstract:
An experimental investigation involving 287 concrete core specimens obtained from large beams cast from 45 to 90 MPa (6500 to 13,000 psi) ordinary portland cement concretes is described. The data indicate the effect of variations of core size and test moisture condition on the measured compressive strength of cores from elements made of high-performance concrete. The relationship between the flexural capacity of the beams and the strength of the cores obtained from the beams is investigated. The data indicate that the least-biased estimate of the in situ concrete compressive strength is found by increasing the strength of sealed cores by 6 percent to account for damage sustained during drilling of the core. However, a reasonable estimate of the in situ concrete compressive strength may be obtained by correcting the strengths from tests of air-dried or soaked cores to account for both core damage and moisture condition factors.