ABSTRACT

Proper filler bitumen ratio of the asphalt mixture has important impacts on the performance of the constructed pavement. Both the asphalt and mineral filler have their own appearance in color, thus, the asphalt mortars mixed with asphalt and mineral filler by different filler bitumen ratios have their own color. The paper provides a new method of the filler bitumen ratio measurement by using the pattern matching algorithm. The cross section images of the asphalt pavement were acquired and the mortar parts were segmented by using gray scale transformation. Then the measurement could be accomplished by searching the types of the asphalt and filler and matching their normalized histogram patterns. The histogram comparison method used were the histogram correlation combined with Bhattacharyya coefficient. The asphalt pavement with the AC-13 and AC-20 gradations were tested, and the results showed that the pattern matching method is worth trying.