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用含重金属的污泥烧制轻骨料并应用于透水混凝土路面砖 被引量:4

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摘要 本研究利用电子工业所产生的含重金属无机污泥,应用包芯造粒的概念,将有害污泥包裹于坯料中心,通过滚动造粒在坯料外表形成一层页岩矿土被覆层,经过干燥与高温烧结成为陶粒;拌合水泥砂浆成型透水路面砖。研究发现,含重金属污泥直接烧结时,坯体表面难以玻化封住气体、形成多孔轻质结构。若以污泥/页岩混合,按重量比1∶1做成坯料,坯料外层再包裹1mm厚页岩粉末,在1150℃时经过25min的烧结,可以生产出发泡良好、比重为1.2的陶粒,有害重金属符合TCLP溶出标准。用电子显微镜进行微观特性分析,陶粒表面致密,内部孔隙细密、均匀。用陶粒加20%的水泥砂浆成型25cm×25cm×6cm的透水砖,透水系数为1×10-2cm/s,抗压强度达到900psi(63kgf/cm2),证实可以达到最佳透水模式,应用于人行道、大型广场、庭园步道。
出处 《建筑砌块与砌块建筑》 2007年第1期36-40,共5页 Structures Units & Units Architecture
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