Foamed sulfur asphalts for pavement recycling and soil stabilization

摘要

Methods for manufacturing a foamed sulfur asphalt stabilized soil and a foamed sulfur asphalt are provided. The foamed sulfur asphalt stabilized soil includes an foamed sulfur asphalt, an air-dried aggregate, moisturizing water, and Portland cement. The foamed sulfur asphalt includes an asphalt binder, elemental sulfur, foaming air, and foaming water. The foamed sulfur asphalt has a foam half-life equal to or greater than about 6 seconds and a foam expansion ratio equal to or greater than 8. The foamed sulfur asphalt also has an amount of elemental sulfur in a range of from about 10% to about 50% by weight of the combined amounts of elemental sulfur and the asphalt binder in the foamed sulfur asphalt.

主权项

1. A method of manufacturing a foamed sulfur asphalt stabilized soil comprising the steps of:
introducing an asphalt binder, elemental sulfur, foaming air, and foaming water into a foaming mixer, where the foaming water has a water introduction pressure, where the foaming air has an air introduction pressure, and where the water introduction pressure is greater than the air introduction pressure; operating the foaming mixer such that a foamed sulfur asphalt forms with a water content of about 3.45%, where the foamed sulfur asphalt has a foam half-life equal to or greater than about 6 seconds and has a foam expansion ratio equal to or greater than 8, and where the foaming mixer operates at a temperature of about 150° C.; introducing the foamed sulfur asphalt, an aggregate having a moisture content, and Portland cement into an aggregate mixer; and operating the aggregate mixer such that the foamed sulfur asphalt stabilized soil forms.