轻骨料混凝土吸声性能研究

李玉平 虞秀勇 胡胜

摘   要：以硅酸盐水泥、页岩陶粒、聚丙烯纤维、发泡剂及其他助剂制备轻骨料混凝土. 研究水泥用量、纤维掺量、页岩陶粒粒徑、发泡剂掺加量、陶粒试块及其串联在中低频范围内的吸声性能. 结果表明，单粒径页岩陶粒制备的混凝土试块在600 Hz频段附近有良好的吸声性能;添加纤维和发泡剂，可改善混凝土材料内部结构，有利于提高材料的吸声性能;陶粒混凝土试块的串联可使其整体吸声性能较原试块提升近80%.

关键词：隔声材料;轻质混凝土;粒度分布;轻骨料;吸声系数;串联

中图分类号：TB321                                文献标志码：A

Study on Sound Absorption Performance

of Light-weight Aggregate Concrete

LI Yuping1†，YU Xiuyong1，HU Sheng2

（1. College of Materials Science and Engineering，Hunan University，Changsha 410082，China;

2. State Grid Hunan Electric Power Company Limited Research Institute，Changsha 410007，China）

Abstract：The light-weight aggregate concrete was prepared with common Portland cement， shale ceramsite， polypropylene fiber， foaming agent and other additives. The characteristics of sound absorption in the low and medium frequency range for the cement content， fiber， grain size of shale ceramsite， foaming agent， ceramsite test block， different types of ceramsite test block and series connection were studied. The results show that the single-grain shale ceramsite concrete has good sound absorption performance near 600 Hz frequency band. When preparing concrete， adding fiber and foaming agent （H2O2） can improve the internal structure of the material， which is conducive for improving the sound absorption performance of the material. The overall sound absorption performance of the series structure of ceramsite concrete test blocks with different particle sizes can be improved by nearly 80% when compared with the original test blocks.

Key words：sound insulating materials;light weight concrete;particle size distribution;light-weight aggregate;sound absorption coefficient;series connection

随着公路[1]、铁路[2]、航空[3]及工业[4]的快速发展，噪声成为了严重危害人体健康的污染源之一[5-6].  为了降低噪声危害，为人们营造健康的安静环境，吸声材料的研发成为了具有较大实际应用价值的研究方向[7- 9].

本文所用的轻骨料是页岩陶粒经破碎筛分获得，呈锯齿状，具有大量连通状、蜂窝状孔隙，用其制作的混凝土具有质轻、孔隙曲折，孔隙率大、保温、吸声、易加工等特点，是一种环境友好型吸声材料[10-11]. 肖建庄[12]提出：骨料性能对混凝土强度影响较大;配制中等强度材料时，影响程度次之;配制低强度材料时，再生骨料对其强度的影响最小. 页岩陶粒混凝土的强度较低，但是中低频吸声性能较好[12-13]. Park等[14]指出当材料的孔隙率为25%时，降噪系数是最佳的，但不同形状骨料的质量分数对材料在中低频的吸声能力的影响很小.  Kim等[15]认为骨料类型……