The Stabilized Base Course
The aggregate base course material was treated with SSPCo’s EMC SQUARED® Stabilizer, an economical concentrated liquid stabilizer treatment for base course materials that increases stability without the excessive rigidity (cracking) typical of cement treated base (CTB) materials. In testing conducted at University of Nevada Reno (UNR), the EMC SQUARED System treatment improved the resilient modulus of base course material by a factor of more than 5 times. Materials engineering consultants Professional Service Industries (PSI) provided the following layer equivalency factors and commented that the treated base course had a layer equivalency factor and load carrying capacity approximately equivalent to that of typical hot mix asphalt pavement.
The Pavement Surface Course
The access roads, trail system, parking areas and work areas at the Las Vegas Springs Preserve are surfaced with a NaturalPAVE® XL Resin Pavement mixture that blends with the tannish white local soil and rock materials and provides “cool pavements” for a site where 115°F summertime temperatures are common. The NaturalPAVE XL Resin Pavement was tested throughout the design and construction process. Using test procedures standardized for flexible pavements such as hot mix asphalt, materials engineers verified that the NaturalPAVE XL Resin Pavement demonstrated significantly higher stability values (resistance to rutting) than typical hot mix asphalt.
The Structural Section
Resilient Modulus testing evaluates the response of a pavement or base course material to dynamic loading. This test method is regarded by AASHTO (American Association of State Highway and Transportation Officials) as the primary factor in characterizing materials for highway pavement applications.
|Resilient Modulus Results and Layer Equivalency Factors|
|Sample ID||Average Resilient
|Aggregate base with EMC SQUARED||
|Untreated Aggregate Base||
As indicated in the Resilient Modulus test results and the layer equivalency factor provided above for the aggregate base course treated with EMC SQUARED, the structural section on this project is more representative of “full depth asphalt”, rather than the typical flexible pavement layer on top of a weaker base course with distinctly different engineering characteristics. Given the low cost of the EMC SQUARED Stabilizer treatment, the pavement life-like performance of the stabilized base provides a highly economical method of “thickening” the effective pavement layer.