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- W627244511 abstract "This paper describes a number of experiments designed to modify conventional road paving materials for use in Arab countries where pavements are subject to wide temperature variations. In all the experiments 60/70 penetration grade bitumen (asphalt) is heated to 150 deg C and the calculated amount of rubber powder (3-7 wt%) is added and mixed in a high shear mixer for 30 seconds. Then the required quantity of molten elemental sulphur (4-30 wt%) is introduced and mixed at the same temperature for another 30 seconds. Chemical interaction between rubber and bitumen (asphalt) occurs at reactive centres. The rubberized binder reacts with sulphur, probably by cross linking, producing a stiffer and more stable binder system. It is concluded that the addition of 4-10% of sulphur softens bitumen, while adding 5% rubber reduces penetration, and increases the softening point and improves shear resistance. Rubber, sulphur, asphalt (RSA) systems with their considerable increase in viscosity, at ambient temperatures, offer greater resistance to irreversible plastic flow, the main cause of permanent deformation in hot climates. RSA systems with low sulphur contents have lower viscosity temperature susceptibility coefficient (VTSC) values and are more resistant to rapid changes in road temperatures. The addition of 5% of natural rubber to the sulphur asphalt binders gives the best improvement in resistance to deformation. Rubber particles in binders act as barriers to stop crack propagation in road surfaces. With present prices of sulphur and rubber, the RSA system is more economic than the conventional road surfacing." @default.
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- W627244511 date "1989-12-01" @default.
- W627244511 modified "2023-09-26" @default.
- W627244511 title "UTILISATION OF SULPHUR AND RUBBER IN MODIFYING ASPHALT BINDERS (BITUMENS) FOR ROAD MATERIALS" @default.
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