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Home > Publications > International Concrete Abstracts Portal
Showing 1-2 of 2 Abstracts search results
Document:
SP128-06
Date:
November 1, 1991
Author(s):
C. T. Tam
Publication:
Symposium Papers
Volume:
128
Abstract:
The use of nondestructive testing in the laboratory is well-documented and standard specifications are available. However, when these nondestructive testing methods are used on site, additional factors have to be taken into consideration to enable meaningful interpretation of measurements obtained. This aspect of knowledge has not received sufficient attention for standard specifications to be drafted. Suggestions are put forward in this paper on precautions to be taken when applying nondestructive testing on site. The methods of testing discussed include the magnetic method of concrete cover or bar size determination, the rebound hardness, ultrasonic pulse velocity and the penetration resistance (Windsor Probe) test. The methods of calibration in the laboratory are reviewed and the ways to check on equipment and its calibration during site work are proposed. The information to be recorded and the interpretation of data are discussed. The need for trained personnel to carry out site testing, as well as experienced professionals to interpret test results, is emphasized.
DOI:
10.14359/3666
SP82-21
September 1, 1984
R.N. Swamy and A.H. Al-Hamed
82
This paper presents tests on 5Omm diameter cores to evaluate their use to determine in-situ concrete strength. The cores, with height to diameter ratios of 1 and 2, were drilled vertically from slabs which were cured in an uncontrolled internal environment to simulate conditions in practice. The variables investigated include concrete strength level, mix proportions, age, size and type of dense coarse aggregate and type of concrete, i.e. normal and lightweight. The core strength results are analysed to discuss the height to diameter correction factor and the relation between core strength and cube strength. The core strength results are related to core and cube pulse velocity and Windsor probe test results.
10.14359/6566
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