Cohesion of Slurry Surfacing Mix on Bitumens of Different Acid Numbers at Different Curing Temperatures

Cohesion of Slurry Surfacing mix is an important technological indicator that allows you to start traffic on time. In this article Slurry Surfacing mix curing is studied in three modes: 10 °C (high humidity), 20 °C (normal humidity) and 30 °C (high humidity). As binders for Slurry Surfacing mix there were used oxidized bitumens produced from light crude-oil and distillation bitumen produced from heavy crude-oil. There was confirmed that the first bitumens are characterized by low acid numbers, while the latter ones – by high ones. On the base of the bitumens there were produced cationic slow-setting bitumen emulsion and Slurry Surfacing mix. It was found that high-acid number bitumen is definitely optimum version in comparison with low acid number for the usage in Slurry Surfacing mix at different temperature modes – by criterion of cohesion strength build-up rate for the mix. This criterion consists of three periods (times) on mix curing: Set («Set» Torque), Traffic (Early Rolling Traffic) and Cure Time (Cured Slip Torque).