Journal of the Korean Asphalt Institute ISSN:2234-0785(Print) 2635-9553(Online) 한국아스팔트학회지

The displacement (d) is used when calculating the flexural energy and flexural stiffness, and is obtained through tangential correction of the load-displacement curve by flexural beam test. However, the reason for performing tangential correction and the method is not specified in the Japanese and domestic methods and standards. This paper is introduced how to set the tangential correction on load-displacement curve and is conducted to effect of the change of the tangential correction method on the flexural energy and the flexural stiffness. The tangential correction of the load-displacement curve is set by specifying two points at the position before the rise of the load behaves like a linear (case I) and by adjusting the interval between the two points specified when the rise of the load starts to behave like a linear (cases II and III). As the result of analysis, it was confirmed that the displacement (d) was different according to the setting the two points, so that the flexural energy and flexural stiffness were different. Therefore, it is necessary to correct the load in order to reduce the human error in the analysis process of the flexural beam test.