The eruption of Mt Pinatubo in the Philippines in 1991 resulted in the deposition of some 5-8 billion cubic metres of volcanic ash over the surrounding area. The ash has been investigated as roadbase and sub-base type material, as a natural pozzolan and as a fine aggregate in bituminous mixes. This paper discusses the basic physical and engineering properties of the ash, locally known as lahar, and presents the results of a laboratory investigation to determine the performance of Hot Rolled Asphalt
(HRA) and Asphalt Concrete (AC) mixes containing lahar.
10th REAAA Conference, Tokyo, 2000. pp. 11