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Estimate of Concrete Strength at Various Ages Using the Ultrasounic Pluse Velocity
|關鍵字:||Ultrasounic Pluse Velocity|
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"Standard Test Method for Measuring the P-Wave Speed and the Thickness of Concrete Plates Using the Impact-Echo Method" Annual Book of ASTM Standards, Vol. 04.02., 1998. 61. Malhotra, V.M., /Editor et al. (1984).“In Situ/Nondestructive Testing of Concrete”, ACI SP-82, 1984. 62.Komloš, K., Popovics, S., Nürnbergerová, T., Babál, B. and Popovics, J.S. (1996).〝Ultrasonic Pulse Velocity Test of Concrete Properties as Specified in Various Standards,〞Cement and Concrete Composites Volume: 18, June, 1996, pp. 357-364.|
The purpose of this thesis is to discuss the relationship between the wave velocity and the compressive strength growth rates of concrete at various ages. At the start, the relationship between the ultrasonic pulse velocity (UPV) and the compressive strength growth rates is established based on the previous test data. All the tested specimens had a constant cement paste volume ratio (Vpaste) of 36%. The variables in mixture proportion of the tested specimens included five water-cement ratios of 0.3, 0.4, 0.5, 0.6, and 0.7 and three volume ratios of fine aggregate to total aggregate (30%, 45%, and 60%). Those specimens were tested at 1, 3, 7, 14 and 28 days. The experimental data were used to establish the relationship curve between the UPV and the compressive strength growth rates. Subsequently, verification program is carried out to investigate if the established relationship is suitable for other concrete specimens with different mixture proportions. The specimens were made of concrete with cement paste volume ratios of 36% and 42%, the constituents of the specimens varied in different water/cement ratios (w/c=0.4, 0.5, 0.6 and 0.7). The volume ratio of fine aggregate to total aggregate was 40%. These specimens were tested at 1, 4, 7, 14 and 28 days. For each test, the UPV and impact-echo velocity (IEV) were measured before compressive test. Experimental results show that the most individual difference between the estimated strength by UPV and the measured strength of concrete are less than 10%. It has been verified that the established relationship curve is suitable for concrete having different mixture proportions with same cement paste content (Vpaste=36%). However, the estimate of concrete strength by UPV of the cement paste is 42% has greater variation than cement paste is 36%. Therefore, the effect of cement paste on the relationship between the wave velocity and the compressive strength growth rates of concrete at various ages should be considered in future research. In addition, IEV is smaller than UPV of the same specimen at same age and between both is not related obviously. As a result, there is a need to establish its own relationship between IE-V and the compressive strength growth rates. A small difference between each experimental data and the best-fit curve of the IEV-strength growth rate relationship is found. The use of the measured IEV to predict compressive strength of concrete is suitable.
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