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Concrete In Australia : March 2013
24 Concrete in Australia Vol 39 No 1 FEATURE: ANCHORING & PRECAST a servo-controlled hydraulic actuator. During the test, the actuator pulled the lifting anchor upwards at a constant rate of displacement until failure. e schematic of the experimental setup and a picture of one of the tests are illustrated in Figures 4 and 5. e testing procedure was designed to reflect the realistic loading condition induced in an anchor during lifting operations. 3.0 MATERIAL PROPERTIES Standard concrete compressive tests and split cylinder indirect tensile tests (also known as Brazil tests) were preformed using standard concrete cylinders (with height of 300 mm and diameter of 150 mm) to determine the properties of concrete. As the tests were conducted only one day after concrete casting, the compressive and tensile tests measurements were carried out at the beginning and at the end of the anchor tests to keep track of the changing concrete properties. After the panel tests, the development of concrete strength was monitored every 7 days until the age of the concrete reached 28 days. e concrete material property tests results are summarised in Table 2. Each value reported in Table 2 is calculated as the average of the results recorded from two tests, except for the case of day one which is based on one test only. 4.0 TEMPERATURE AND HUMIDITY Ambient temperature and humidity within the laboratory where the specimens were cast and tested were recorded at Specimen ID Anchor type Reinforcement arrangement Batch of concrete comments CA1 CA05240 REO1 1 CA2 CA05240 REO1 1 Identical to CA1 EPA1 EPA09 REO1 1 EPA2 EPA09 REO1 1 Identical to EPA1 SJH1 SJH REO1 1 SJH2 SJH REO1 1 Identical to SJH1 CA3 CA05240 REO2 2 Location of mesh as for SJH3 CA4 CA05240 REO2 2 Location of mesh as for EPA3 EPA3 EPA09 REO2 2 EPA4 EPA09 REO2 2 Identical to EPA3 SJH3 SJH REO2 2 SJH4 SJH REO2 2 Identical to SJH4 NOTE: Specimen ID speci ed in the table and used throughout the paper are slightly different from labels placed on specimens (shown in Figures 5, 8 and 9). Table 1. Summary of anchor and reinforcement details used in different test specimens. Threaded bar was screwed to the embedded inserts at one end and the other end was attached to a frame which was bolted to the laboratory strong floor The lifting anchor is attached to an appropriate clutch and pulled up by a hydraulic actuator Figure 4. Schematic of the test setup. Figure 5. Layout of the loading arrangement.