OVER-STABILISED BITUMEN EMULSION FOR SLURRY SURFASING BY MIX TIME CRITERION

Slurry Surfasing was investigated using over-stabilised emulsions and highly reactive stone material with a methylene blue index of 18 at high temperatures. Unmodified emulsions were produced on four different emulsifiers at the same dosage -1.2% by mass of the bitumen emulsion itself. Slurry Surfasing was designed on the basis of the investigated emulsions, screening of the 0-4 mm fraction, water, Portland cement and mix time regulator. Setting the mix time for each of the Slurry Surfasing based on six emulsions made it possible to state that there is a relationship between the characteristic of the breaking behavior of the bitumen emulsion mixing stability with cement and mix time. It was established that at a temperature of 30 °C, the use of an over-stabilised emulsion with a special emulsifier at its dosage of 1.2% allows the production of mixtures with highly reactive screenings without including a mix time regulator in the mixture.

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