DESIGN OF ASPHALT MIXES FOR HOT CLIMATES.

Performance standards of various asphalt layers play an important role in the many aspects of the paving industry. The performance of asphalt mixes is dependent on: the quality of the mix; the engineering characteristics of the mix; the standard of quality control during the laying of the mix; engineering characteristics of the granular layers of paving, and particularly those of flexibility, rigidity and adhesiveness; traffic load and types; temperature, humidity and drainage conditions. This paper presents proposals for the quality of the mix components. The maximum water absorption of the aggregate must not exceed 2%. The ratio of filler to bitumen should be between 1. 0-1. 5. The permitted quantity of natural sand additive must on no account be higher than 5% of the total aggregate weight.