制备了以陶粒为骨料的多孔状地铁吸声材料.研究不同的陶粒粒径及级配,水灰比,水泥掺量以及掺和料对材料吸声性能和流阻的影响.结果显示:提高小陶粒的掺量,减小水灰比,减少水泥用量以及掺入一定的掺和料(膨胀珍珠岩,硅灰)对提高材料的吸声性能是有利的.材料的流阻不是越大越好,获得最佳吸声性能和强度的材料时,有一个最佳流阻值,为1,475 Pa·S/m3.该样品的组成为25%水泥(质量分数,下同),75%大尺寸(2.4～4.8 mm)陶粒,外加4.2 g减水剂,水灰质量比为0.3,外掺膨胀珍珠岩占骨料的5%,硅灰占水泥的12%.
Metro sound absorbed materials are prepared by the concrete molding method and using light ceramisite as aggregate. The influences of aggregate size and gradation, water-cement ratio, cement and admixture content on the sound absorption characteristics and air-flow resistivity were investigated. The results demonstrate that it is favorable to increase the content of the small size ceramisite, reduce watercement ratio, decrease cement content and add definite admixture (expanded perlite or silica fume). With the increase of air-flow resistance, there is an optimum air-flow resistance 1,475 Pa · S/m3 for the best absorbption characteristic. The composition of specimen with better absorption properties and mechanical strength is 25% cement( mass fraction, the same below), the 75% large size (2.4-4.8 mm) ceramisite, water-cement mass ratio is 0. 3, water reducer 4.2 g, expanded perlite addition by cement mass 5%, silica fume addition by ceramisite mass 12%.
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