Abstract
Although great efforts are being made to keep sulphur and its compounds out of the atmosphere, recovered sulphur seems certain to greatly overload the market unless new, commercially viable outlets can be found. Numerous efforts are being made in the United States and Canada to develop new sulphur uses. One of these new uses of sulphur is envisioned as an asphalt paving material. The addition of sulphur to asphalt permits the utilization of heretofore nonusable one-sized sands and poorly graded aggregates and renders the mixes equivalent or superior in terms of mechanical properties to the conventional asphaltic concrete using dense graded aggregates. The sand-asphalt-sulphur mixtures investigated consisted of elemental crystalline sulphur of commercial grade (99.5 ± purity), three different gradings of naturally occurring sands and asphaltic cements with two different standard penetration grades. The influence of both materials and process variables on mechanical properties and a preliminary comparison of the engineering characteristics of sand-asphalt-sulphur mixtures with the conventional asphaltic concrete mixtures using well graded crushed limestone aggregates were evaluated. In this respect, materials variables included sand-asphalt-sulphur ratios, asphalt type and sand type. Process variables investigated included mixing temperature, mixing time, cure time, and compaction. Engineering properties evaluated included Marshall and Hveem stabilities, mixture density, air void content, tensile strength properties, stiffness, and thermal behavior. In addition to these, dilatational tests with strip biaxial specimens were run on a selected number of sand-asphalt-sulphur mixtures and the conventional asphaltic concrete to explore the use of this testing technique to characterize and evaluate the asphalt treated materials. Concurrent with the laboratory evaluation program, an odors and emissions investigation was conducted using evolved gas analysis (EGA) techniques to monitor hydrogen sulfide emissions from mixes prepared during the program. ...
Ahmad, Hafizuddin (1974). A laboratory study of the use of sulphur in sand-asphalt mixes for flexible pavements. Texas A&M University. Texas A&M University. Libraries. Available electronically from
https : / /hdl .handle .net /1969 .1 /DISSERTATIONS -213294.