酸性骨料沥青混凝土耐久性研究

Study on durability of asphalt concrete containing acidic aggregate

在水工沥青混凝土防渗结构中,沥青与酸性骨料界面黏结性较差,长期浸水环境下沥青与酸性骨料界面处的沥青膜容易被水置换造成沥青与骨料分离,从而降低整个沥青混凝土结构的耐久性。尝试通过添加抗剥落剂来提高酸性骨料沥青混凝土的耐久性,并对掺抗剥落剂的酸性骨料沥青混凝土和碱性骨料沥青混凝土长龄期浸水和冻融循环后的力学性能与耐久性能进行了试验研究。结果表明:掺加抗剥落剂可有效改善酸性骨料与沥青之间的黏结力,提高酸性骨料沥青混凝土的力学性能与耐久性能;与碱性骨料沥青混凝土相比,掺抗剥落剂的酸性骨料沥青混凝土具有更加优异的综合性能,可用于水工防渗建筑中。

In the anti-seepage structure of hydraulic asphalt concrete,the interfacial adhesion between asphalt and acidic aggregate is poor.Under long-term immersion environment,the asphalt film at the interface between asphalt and acidic aggregate is easily replaced by water,resulting in the separation of asphalt and aggregate,thus reducing the durability of the whole asphalt concrete structure.We try to improve the durability of asphalt concrete containing acidic aggregate by adding anti-stripping agent,and compare the mechanical properties and durability of asphalt concrete containing acidic aggregate and asphalt concrete containing alkaline aggregate with anti-stripping agent after long-term immersion and freeze-thaw cycles.The results showed that the addition of anti-stripping agent can effectively improve the bonding force between acid aggregate and asphalt,and improve the mechanical properties and durability of asphalt concrete containing acidic aggregate.Compared with asphalt concrete containing alkaline aggregate,asphalt concrete containing acidic aggregate by adding anti-stripping agent has better comprehensive performance and can be used in hydraulic anti-seepage buildings.