土石坝沥青混凝土心墙材料配合比试验研究

发布时间：2018-02-02 00:07

本文关键词： 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　出处：《长江科学院院报》2017年06期 　论文类型：期刊论文

【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。
[Abstract]:The traditional idea is that alkaline aggregate can produce chemisorption with the surface active substance of asphalt in the impervious structure of hydraulic asphalt concrete, so it has good adhesion; The adhesion and durability of acid aggregate and asphalt are mainly physical adsorption, and the adhesion and durability of asphalt can not be guaranteed. Under the long-term water immersion, the asphalt membrane is easily replaced by water and stripped from the aggregate surface. Therefore, the structure is destroyed. There are abundant acidic natural gravel and gravel in the dam site area of Nuer water conservancy project, which is close to the dam site and is easy to be mined, but there is no alkaline aggregate yard near it. Two kinds of aggregate, artificial limestone aggregate and natural sand gravel, were used to study the mixing performance of indoor asphalt concrete. The gradation index (r = 0.40) and filler F ~ (12%) were proposed. The optimum mix ratio of asphalt content of artificial limestone aggregate and natural sand gravel aggregate is 6.9% and 6.0% respectively, which is a reference for design.
【作者单位】：长江科学院材料与结构研究所;长江科学院水利部水工程安全与病害防治工程技术研究中心;河海大学水利水电学院;新疆奴尔水利枢纽工程建设管理局;
【分类号】：TV431
【正文快照】： 1沥青混凝土心墙坝特点在西部大发展战略的支持下,一批大型水利水电工程在云南、贵州、四川、西藏、新疆等地区开工建设。新疆大多数河流均发源于高山冰川区,在水力推动下,常有冰川泥石流将卵石、砾石等冰积物带入河道,使得新疆具有广阔的山涧河滩、戈壁,天然砂砾石料资源极为

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