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The trends of the ratios of decrease of the compressive strength and splitting tensile strength according to temperature appear to be highly similar regardless of mix proportions.
An additional correlation study based on the ratios of decrease of the compressive strength and splitting tensile strength (measured mechanical strengths) of the fire-damaged concrete was performed, as illustrated in Fig. 9a.
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The ratio of decrease of compressive strength reduces to approximately 30% at 200 °C, which exhibits a noticeable variation from that of splitting tensile strength, except for the C4 mix proportion; however, the ratio of decrease of both the strength measurements are similar at 400 °C (approximately 60% of undamaged strength).
On the other hand, the ratio of decrease of the splitting tensile strength reduces to approximately 20% of the undamaged strength, at 600 °C; the degree of decrease is substantial when compared to the decrease in compressive strength (approximately 50%).
Figure 8 presents the correlation between the ratio of decrease of the residual material properties, specifically compressive strength, splitting tensile strength, and static elastic modulus, and the ratio of increase of the nonlinearity parameters as measured by each of the nonlinear ultrasonic methods.
Accordingly, the various ratios of decrease of mechanical strength can be used as a guideline to evaluate the heating temperature during a fire.
Open image in new window Fig. 7 Comparison of ratios of decrease of strength with temperature.
Open image in new window Fig. 8 Correlation between ratio of decrease of the residual material properties and ratio of increase of the nonlinearity parameters.
However, the rates of decrease of these two ratios are different due to the different ti-tv ratios, and this determines the expected relative performance of the two SR functions across the series.
However, the rate of decrease of packet delivery ratio for SGFL is obviously higher than that of POR.
If the ratio of government in health expenditure increases, the ratio of out-of-pockets will decrease, thus promoting equity.
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CEO of Professional Science Editing for Scientists @ prosciediting.com