Statistical Evaluation of Non-Agglomerating Coating for Granulated Natural Asphalt
DOI:
https://doi.org/10.5614/itbj.eng.sci.2011.43.1.4Abstract
Agglomeration of granulated Buton natural asphalt during storage is of major concern in its large-scale commercial application. This work develops a simple test method to evaluate the performance of agglomeration-resistant coating for granulated Buton asphalt, consisting of water-based polymeric primary coating and mineral-based secondary coating. The method uses a static load cell to measure the agglomerated granule count fraction under simulated storage conditions. A 24-1 fractional factorial experiment with two replications is employed to evaluate the effect of coating drying temperature, drying time, asphalt to secondary coating mass ratio, and secondary coating type on the agglomerated count fraction at ambient temperature and 60 oC. The test is able to measure a statistically significant increase in agglomeration resistance when the coating is applied, with an agglomerated fraction of 17.5% at 60 oC. The test identifies asphalt to secondary coating weight ratio as a significant factor, with an ANOVA p-value much lower than other effects. A decrease in this mass ratio from 5:1 to 5:2 increases the agglomeration, which is hypothesized to be attributed to the hydrated cementitious phase between granular external surfaces. More work is needed to identify the acceptable fraction of agglomerated granules.Downloads
References
Soeroso, B., Utilization of Buton Asphalt for Road Construction in Indonesia (in Indonesian), Proceedings of Buton Asphalt Technology Workshop, Department of Public Works Research and Development Center, 21 November 2006.
Siswosoebrotho, B.I., Kusnianti, N. & Tumewu, W., Laboratory Evaluation of Lawele Buton Natural Asphalt in Asphalt Concrete Mixture (in Indonesian), Proceedings of the Eastern Asia Society for Transportation Studies, 5, pp.857-867, 2005,
Asrun, Buton Asphalt (in Indonesian), Southeast Sulawesi Public Works Service, 1999, http://sultra.tripod.com/ASPAL_BUTON.htm (Accessed on 26 March 2010)
Hardjosukanto, S., Lawele Buton Asphalt: its Difference from Kabungka Buton Asphalt, Conditioning, and Application in Asphalt Mixes (in Indonesian), Majalah Teknik Jalan dan Transportasi, 104, pp.16-20, 2004.
Kurniaji, Application of Buton Lake Asphalt in Asphalt Hot Mixes (in Indonesian), Transportation Infrastructure Research and Development Center Report, Department of Public Works, 2002.
Montgomery, D.C., Design and Analysis of Experiments, 5th edition, John Wiley and Sons, Singapore, 2001.