CALIBRATION OF CONCRETE COMPRESSION TESTING MACHINES PRODUCTS

Boris Katz, Liron Anavy, Itamar Nehary

Abstract

A wide spectrum of compression testing machines is used for strength testing of concrete pipes. The main specialty of the testing machine is the length (2-2.5 meters) of the tested product (pipes), which requires a loading beam with corresponding length. Non-parallelism of supporting and loading elements, unequal distribution of loads, a big parasite torque effort because of the loading elements’ large size leads to another measurement errors and to increased uncertainties in calibration process according to ISO 7500-1:1999. For making the right choice in using and setting measuring elements (load cells) and accessories, one must take into account the structure and technological specialties of the testing machines: how many pistons are in it, the method of pressure measurement, the arrangement of measuring and supporting elements in the machines. In this paper we analyze in detail the different measuring methods and recommend choosing the best method of calibration, which most diminishes the uncertainty.

Keywords

calibration of testing machine, accessory, uncertainty

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PWC-2003-TC3-037.pdf

DOI

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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