Guidelines for Mix Design and Construction of Slurry Seal and Microsurfacing Pavement Preservation Treatments
AdvisorSebaaly, Peter E
Civil and Environmental Engineering
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The objectives of this research was to develop a mix design and construction guidelines for Slurry seal and Microsurfacing, evaluate their engineering properties & performance characteristics. Construction and inspection guidelines for a selected preservation technique was prepared for Carson City Public Works (CCPW). The guideline include materials selection, mix design & verification, construction procedure, quality assurance inspection, equipment selection and calibration.The guideline incorporate visual aids and practical on-site observations in the form of construction activity photos. Multiple construction site visits were made to observe the state-of-the-art practices during the development of the guideline. Engineers, maintenance crew and Licensed Contractors, material suppliers were interviewed to review common existing practices.Mix designs were performed using Type II aggregate for slurry seal and Type III aggregate for microsurfacing. The emulsion used for both mix designs was a Latex Modified Cationic Quick Setting Emulsion (LMCQS). A 0.1% of additive by dry weight of aggregate i.e. Aluminum Sulfate Al2(SO4)3 and 0.5% of mineral filler by dry weight of aggregate i.e. Type II Portland Cement were used for both mix designs. The mix designs were conducted following the International Slurry Surfacing Association (ISSA) recommended performance guideline. The Optimum emulsion content (OEC) for the mix designs were determined graphically by plotting the physical data set of the wet track abrasion test and sand adhesion test by loaded wheel.