粉煤灰陶粒轻质混凝土声屏障性能试验研究

Experimental Study on Sound Barrier Performance of Fly Ash Ceramsite Lightweight Concrete

混凝土是一种应用广泛、可使用多种固废制备的建筑材料。本研究将粉煤灰陶粒作为轻骨料,水泥-粉煤灰-硅灰-煤系偏高岭土作为复合胶凝材料,制备用作声屏障的粉煤灰陶粒轻质混凝土,并对其力学性能、吸声性能和抗碳化性能进行试验研究。结果表明:当粉煤灰-硅灰-煤系偏高岭土总掺量为胶凝材料总质量的10%时,试样的力学性能、抗碳化性能有所提高,吸声性能有所降低;随着粉煤灰-硅灰-煤系偏高岭土掺量进一步增加,试样的力学性能、抗碳化性能有所降低,吸声性能有所提高。1500 Hz及以下频率吸声系数变化幅度较小,2000 Hz时吸声效果最好,试样的平均吸声系数在0.44~0.58,降噪系数在0.74~0.89。

Concrete is a widely used building material that can be prepared using a variety of solid waste.In this study,fly ash ceramsite was used as lightweight aggregate,and cement-fly ash-silica fume-coal metakaolin was used as composite cementitious material to prepare fly ash ceramsite lightweight concrete for sound barrier.The mechanical properties,sound absorption performance and carbonation resistance of fly ash ceramsite lightweight concrete were studied.The results show that when the total content of fly ash-silica fume-coal metakaolin is 10%of total mass of cementitious materials,the mechanical properties and carbonation resistance of samples are improved,and the sound absorption performance is reduced.With the further increase of fly ash-silica fume-coal metakaolin content,the mechanical properties and carbonation resistance of samples decrease,and sound absorption performance increases.The sound absorption coefficient changes little at 1500 Hz and below,and the sound absorption effect is the best at 2000 Hz.The average sound absorption coefficient of sample is 0.44~0.58,and the noise reduction coefficient is 0.74~0.89.