Windsor penetration test
Two probe styles are available: one for lightweight, low density concrete with air filled aggregate and the other probe for more standard mix designs. Probes There are two power settings available, low and standard power. When compressive strength test information is not available, nondestructive testing NDT methods can be used to estimate in-situ concrete strength properties. The rebound hammer is a surface hardness tester for which an empirical correlation has been established between strength and rebound number. Can I use only one probe at a time? The probe penetration test was performed using controlled propulsion energy kinetic energy. Nonetheless, due to the lighting conditions of the tunnel and the high number of tests to be performed, the average length of the exposed probe was determined by averaging two measurements of the exposed length using a digital calliper, as shown in Figure 3.
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Non-Destructive Testing of Concrete: An Equipment Guide
This measurement was performed to cover a wider range of compressive strengths to define the correlation curve. Besides, Windsor probe penetration tests and Schmidt hammer tests were also performed. The pulse velocity method is an ideal tool for establishing whether concrete is uniform. As a result of the above-mentioned factors, a greater number of tests is necessary to detect significant variations in the concrete strength when comparing, for example, the probe penetration test with the rebound hammer test. In summary, ultrasonic pulse velocity tests have a great potential for concrete control, particularly for establishing uniformity and detecting cracks or defects. Measuring The electronic measuring device is menu driven and programmed for selection according to the following parameters. This value is consistent with the value obtained in the variability study of the test and is used to determine the number of tests to be performed at this stage, as stated in section 2.
Prediction of concrete compressive strength using non-destructive test results
Moreover, during the tests, the propulsion energy control proved to be an important factor to ensure that the test shows sufficient sensitivity to detect different levels of strength. The test surface can be horizontal, vertical or at any angle but the instrument must be calibrated in this position. This value is consistent with the value obtained in the variability study of the test and is used to determine the number of tests to be performed at this stage, as stated in section 2. The mechanical averaging device consists of two triangular plates. Measures the compressive strength of concrete accurately and effectively, on-site in the field. Nonetheless, like the rebound hammer test, the hardness and size of the coarse aggregate can affect the results of the test, [1,2]. Although calibration charts are provided by the manufacturer, the instrument should be calibrated for type of concrete and type and size of aggregate used.
The time taken for the pulse to pass through the concrete is measured by electronic measuring circuits. With these data, the characteristic strength of the concrete f ck was calculated through equation Based on these considerations and the total length of the tunnel, the possibility of using the pin pullout test in evaluating the shotcrete structures was discarded. Probe penetration test applied for evaluating shotcrete compressive strength. Finally, the probe penetration test was considered.