摘要
传统观念认为:水工沥青混凝土防渗结构中,碱性骨料可以与沥青中的表面活性物质产生化学吸附,有很好的黏附性;酸性骨料与沥青主要是物理吸附作用,与沥青的黏附性和耐久性无法保证,在长期浸水作用下,沥青膜易被水逐渐置换而从骨料表面剥离,从而导致结构破坏。奴尔水利枢纽工程坝址区内有丰富的酸性天然砂砾石料,距坝址较近,便于开采,但其附近没有碱性骨料料场。依托奴尔水利枢纽工程,采用人工灰岩骨料及天然砂砾料2种骨料,进行了室内沥青混凝土配合比性能试验研究,提出了级配指数r=0.40、填料F=12%、人工灰岩骨料沥青含量B=6.9%和天然砂砾石骨料沥青含量B=6.0%优选配合比,供设计参考。
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.
出处
《长江科学院院报》
CSCD
北大核心
2017年第6期143-148,共6页
Journal of Changjiang River Scientific Research Institute
关键词
土石坝
沥青混凝土心墙坝
混凝土配合比
奴尔水利枢纽
天然砂砾石料
earth-rock dam
dam with asphaltic concrete core
concrete mix proportion
Nuer water control project
natural gravel aggregate
