On the Proportion of Asphalt Mixtures

The asphalt pavements are classified into asphalt concrete, topeka, sheet asphalt etc. by the maximum grain size of using aggregate and also sectioned coarse-graded type, dense-graded type, one-sized type etc. by the difference of its grading. As the grain size and grading of aggregate give essentially the great influence on the nature of asphalt pavement i.e. stability, durability, flexibility and skid-resistance, the most adequate type of pavement becomes practically to be selected according to the object of construction. Then the best proportion of asphalt mixture comes into question and up to this time many suggestions have been exhibited due to the past experiences or various studies. Nevertheless, the conclusive point on this problem is not able to be obtaind yet. Writers have taken notice of Talbot's formula P=100×(d/D)^n being said to produce the maximum density and made the test pieces of asphalt mixture with the different grading aggregate by means of varying its maximum grain size D and exponent n. After performing Marshal test for them, it is tried to investigate the results from all directions. This is the report on it.