We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Evaluation of a modification of current microsurfacing mix design procedures.
- Authors
Robati, Masoud; Carter, Alan; Perraton, Daniel
- Abstract
Although microsurfacing is widely used, current tests and mix design methods mostly rely on laboratory conditions and the correlation between laboratory results and field performance is poor. Therefore, there is a need to develop new mix design procedures, specifications, and guidelines for microsurfacing mixtures. The research described in this paper intended to suggest modifications to the actual International Slurry Seal Association (ISSA) mix design procedure for microsurfacing. The first part of study reports the findings of a detailed laboratory investigation concerning the effect of asphalt emulsion, added water content, and Portland cement on the design parameters and properties of microsurfacing mixtures. A multilevel factorial design is used to assess the effect of different mixture proportions on the test responses. For this, one aggregate type, one asphalt emulsion type or grade, and one aggregate gradation were used in the study. This part of study consisted mainly of establishing a method for preparing and testing microsurfacing mixture using four main mixture design tests proposed by the ISSA (TB 139, TB 113, TB 100, and TB 109). The results obtained with ISSA TB 109 and ISSA TB 100 mixture design tests were found highly variable and not precise enough to suggest optimum mix design. For the second part of this study, different tests were also studied to refine the current mix design procedure. The results have shown that ISSA TB 139 can be used to define the optimum water content at which samples should be tested, and that ISSA TB 147 mix design test should be used to define the optimum asphalt emulsion content.
- Subjects
SURFACE coatings; ASPHALT emulsion mixtures; PAVEMENT maintenance &; repair; PORTLAND cement; MINERAL aggregates; FACTOR analysis
- Publication
Canadian Journal of Civil Engineering, 2015, Vol 42, Issue 5, p319
- ISSN
0315-1468
- Publication type
Article
- DOI
10.1139/cjce-2013-0578