What is the difference between “dense graded” and “open graded” emulsion mixes?

Dense graded mixtures contain aggregate which have been selected to include fine material and filler; therefore, the compacted mixture has low air voids and is essentially impermeable to water. Open graded mixtures contain aggregate without the fine fractions, and when compacted, have high voids and are permeable to water. Because of its high fines content, the aggregate in dense graded mixes is generally more reactive towards asphalt emulsion and demands a slower-setting grade than open graded mixtures.

Why should I use cold emulsion mix rather than hot mix?

Cold mixes use less energy and produce fewer emissions than hot mixes. Cold mix plants are less expensive to operate, simpler to use, and are more mobile than hot mix plants; emulsion mixes also lend themselves to on- site and in-place manufacturing. The ability to stockpile cold mix material for future use leads to less waste and reworking than with hot mix.

How should I select the emulsion for cold mix?

Emulsion selection is on the basis of laboratory mix designs. Mix designs ensure that the emulsion is compatible with the aggregate and that the mixture is durable. Slow-setting emulsions are generally used for dense mixes, and medium- setting emulsions for open graded mixes. The emulsion formulation can be adjusted, if necessary, to best suit the aggregate and application. See your state’s Product Locations & Applications page for more options.