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How Slurry Seal is Made |
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Slurry is made in the specially designed RoadSaver II microsurfacing machine manufactured by CPM. This equipment carries a quantity of unmixed materials that are blended together in a continuous flow pugmill. The use of this technologically advanced machinery insures a smooth consistently uniform mixture. Slurry is made quickly and accurately at the project site. Mixing and spreading are accomplished in one continuous operation, with the surface being ready to reopened to travel within a few hours. Shown below are the materials and percent quantities for a type I slurry seal:
Figure 1. Slurry Seal type I mix design When the slurry seal is cured, the only components left are the aggregate and asphalt oil. The water is used only to aid in working with the mix as it is applied. Aluminum sulfate, portland cement, lime, or other additives are curing agents that either speed up or slow down the curing process. Figure II shows the effects that different agents have on the mix.
Figure II. Slurry Seal curing agents Latex is used to increase the tensile strength (or breaking strength) of the slurry when it is cured. This helps the slurry resist cracking or separating as traffic squeezes and pushes on the asphalt pavement. Carbon Black is a cosmetic additive only. It is there to make the final slurry surface a darker black. How Emulsified Asphalt is Made CPM's Slurry Seal Brochure Adobe Acrobat 220.6k |
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