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Comparison of Non-Destructive Test Methods for Concrete Compressive Strength in Existing Structures
Estimates of in-place strength for the structural evaluation of concrete structures is a required element of a modern repair/rehabilitation project. Although in-place cores are the most direct method for determining concrete compressive strength, economy of both time and money, has lead to the development of other test methods in determining in-place concrete compressive strength. This has also allowed more tests to be taken for a significant increase in the confidence with the quality of the existing concrete.
different tests have different limitations and uses. These
need to be fully understood before the test program starts, so that the
correct test is used for the correct application. This
article will review the most common test methods for in-place concrete
compressive strength testing: coring, the Windsor Probe™, the Windsor
Pin™, manual test hammer, and the digital test hammer
* As related to 150mm ( 6 inch ) x 300mm ( 12 inch ) cores, to convert to concrete cubes multiply by 1.1
Typical 'Destructive' test method for concrete compressive strength. Cost in both time, money and structural and aesthetic integrity of the structure hs lead to the development of 'Non Destructive' Tests.
This is most effective Non Destructive Test, with adherents and practitioners around the globe. The wide range of concrete compressive strength that can be tested as well as the simplicity and rapidity of it's use has contributed to the test popularity. It uses a powder actuated charge to drive a pin into the concrete under test. The depth of penetration of the pin corresponds to the compressive strength of the material under test.
Using resistance to penetration with a high tensile steel spring this test method can not only test concrete, but brick, mortar, masonry and more! A low coefficient of variation, rapid and simple to use, this test has adherents around the globe. The only limitation is the maximium compressive strength that can be tested.
The most popular test method. This is very simply to use and almost no cost. Drawbacks are the high coefficient of variation and the significant amount of tests needed to be taken in order to determine the result.
This method supplements the manual test hammer by using modern digital electronics to record and manipulate the large amount of data needed to effectively use the rebound test hammer method.