The lack of information concerning pavement performance in relation to the physical properties of coarse ash was identified as a major factor hampering the effective use of ash in road construction. This paper discusses research on this subject and provides information and data pertaining to the potential use of coarse ash for road construction.
Attention is drawn to the possible serious consequences of a sudden release of air during both the testing and operation of fibre-cement pipelines. The first part of the paper deals with failures during watertightness tests, highlighting important factors relating to such tests. The second part of the paper presents laboratory test results and gives an indication of the magnitude of induced pressure spikes due to sudden air release. Recommendations are made for the location of de-aeration points to limit air-release induced overpressures.