This paper presents information relating to the application and performance of the embedment type vibrating wire strain gauge. A typical gauge and its principle of operation are described and methods of calibration are given. Sources of possible errors in measured strains, in particular those resulting from distrubances caused by embedding the gauge, are considered. Methods for installing gauges to measure both short-term and time-dependent long-term strains are presented. Some results that were obtained with vibrating wire gauges are compared with measurements made with mechanical and electric-resistance gauges. Refs.
COOK, DJ, MORGAN, DR, SIRIVIVATNANON, V & CHAPLIN, RP 1977, 'RAMACHANDRAN,VS AND SEREDAS,PJ DISCUSSION ON DIFFERENTIAL THERMAL-ANALYSIS OF PREMIX POLYMER CEMENT MATERIALS - REPLY', CEMENT AND CONCRETE RESEARCH, vol. 7, no. 3, pp. 357-358.
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A low-cost creep rig based on a commercially available flexible-diaphragm jack (flat jack) was developed by the authors. It was designed for creep tests on 380 x 130 x 130 mm specimens at a maximum load of 170 kN. A portable hydraulic hand pump is used with the flat jack to apply the load. Thirty rigs of this type have been used, six of them for continuing tests over a period of three years. The paper describes the methods used to calibrate the jack and shows that the rig is capable of maintaining a constant load to the accuracy required by the Australian Standard. © 1977, Thomas Telford Ltd. All rights reserved.