It revealed a decreasing trend in ultrasound velocity with an increase in times of temperature differential cycling, showing a strong linear relationship between the ultrasound velocity loss and strength loss, confirming the correlation between the degree of concrete strength degradation and internal damage.
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Experimental Study on the Compressive Strength and Fatigue Life of Cement Concrete under Temperature Differential Cycling.
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The sentences
That is, for cement concrete, the compressive strength shows an overall trend of “first increasing and then decreasing” during the process of temperature differential cycling.