Abstract: In impervious structures such as hydraulic asphaltic concrete, alkaline aggregate is generally considered to be of good adhesion resulted from the chemisorption between alkaline aggregate and surface active materials of asphalt; while acidic aggregate could lead to structural damage as asphalt film is easily replaced by water and detached from aggregate under long-term water immersion because the physical adsorption could not guarantee the adhesion and durability of asphalt. By using artificial limestone and natural gravel aggregates, laboratory tests were conducted to research the mix proportion of hydraulic asphalt concrete for Nuer water control project in Xinjiang, which has rich natural acidic gravel aggregate near the dam site but no alkaline aggregate nearby. Optimization of mix proportion is proposed as follows gradation index r=0.40, filler content F=12%, asphalt content B=6.9% for concrete with artificial limestone aggregates, and B=6.0% for concrete with natural gravel aggregates.

Key words: earth-rock dam, dam with asphaltic concrete core, concrete mix proportion, Nuer water control project, natural gravel aggregate