Comparison percent empty space Marshall samples with cores taken from the asphalt layer in place

One of validate benchmarks for assessing and evaluating the quality of asphalt in road projects , such as density and percent empty space. percent empty space of the Asphalt layer implemented has an important effect on its optimal performance, durability and stability. using of (ASTM D2014) is the usual method for measuring percent empty space of asphalt layer. mentioned method for determination percentage empty space using of density sample Marshall which is determined under completely "standard" laboratory conditions . In the present article determination percent empty space asphalt layer implemented with using of density core obtained of asphalt layer implemented done, and then the result comparison with percent empty space determinate by density sample Marshall transpire if used density core obtained of asphalt layer implemented In calculating percent empty space the result )2.8-3.8) percent more than percent empty space calculated With using of Marshall sample density .Therefore, if the percent of empty space of the Marshall sample is used in determining the parameters of the asphalt layer, due to the different temperature conditions and experimental and operational density, results other than reality will be obtained. According to the results of this research, it is better to use the density core obtained of asphalt layer implemented in determine the percentage of empty space asphalt layer.