再生砂水泥基材料的性能试验研究

Experimental Study on the Performance of Recycled Sand Cementitious Materials

在利用砖混建筑废弃物生产的再生砂中,掺加工业固废粉煤灰制备再生砂水泥基材料,研究了胶砂比和粉煤灰掺量对用水量、表观密度、抗折强度和抗压强度的影响,基于抗压强度的最大值确定再生砂水泥基材料的最优配合比。随后使用石英砂直接替换再生砂,研究了再生砂替代率对材料抗压强度和抗折强度的影响。试验结果表明:当胶砂比为1∶2.5、粉煤灰掺量为10%时,再生砂水泥基材料的抗压性能最优;相比使用石英砂的水泥基材料,再生砂水泥基材料的抗压强度降低了25.5%,但当再生砂替代率为40%时,相较于100%使用石英砂的水泥基材料,其抗折强度提高了7.7%。

In the production of recycled sand using brick and concrete construction waste,industrial solid waste fly ash is added to prepare recycled sand cementitious materials.The effects of the ratio of binder to sand and fly ash on water consumption,apparent density,flexural strength,and compressive strength are studied,and the optimal mix ratio of recycled sand cementitious materials is determined based on the maximum value of compressive strength.Subsequently,quartz sand is directly used to replace the recycled sand,and the effect of the replacement rate of recycled sand on the compressive strength and flexural strength of the material is studied.The experimental results show that the compressive performance of recycled sand cementitious materials is optimal when the cement sand ratio is 1∶2.5 and the fly ash content is 10%.Compared to cementitious materials using quartz sand,the compressive strength of recycled sand cementitious materials is reduced by 25.5%.However,when the replacement rate of recycled sand is 40%,compared to cementitious materials using quartz sand at 100%,the flexural strength is increased by 7.7%.