粉煤灰煤矸石混合浆液性能试验研究

Experimental study on performance of fly ash and coal gangue mixed slurry

为探寻粉煤灰煤矸石混合浆液的性质,以粉煤灰和不同粒径的煤矸石为试验材料,采用正交试验方法,通过SPSS软件处理试验数据,分析体积浓度、煤矸石粒径和粉煤灰与煤矸石质量比对浆液的密度、黏度和析水率的影响规律;并结合注浆现场实际,设计黏度降低试验。结果表明:体积浓度、煤矸石粒径、粉煤灰与煤矸石质量比3种因素都对浆液密度和浆液黏度变化起到了显著作用;其中煤矸石质量占比达到70%会使浆液黏度增加变快;体积浓度和粉煤灰与煤矸石质量比对浆液析水率变化起主要作用,其中煤矸石质量在不同占比对析水率的变化快慢有差异,煤矸石粒径对浆液析水率变化起次要作用;聚羧酸减水剂含量增加对粉煤灰浆液和粉煤灰煤矸石混合浆液黏度降低有明显的作用,并随剂量的加大,黏度变化逐渐减缓达到极值。

In order to explore the properties of the mixed slurry of fly ash and gangue,fly ash and gangue of different particle sizes were used as the test materials,the orthogonal experimental method was adopted,and the test data were processed by SPSS software to analyze the influence of volume concentration,gangue particle size and fly ash and gangue mass on the density,viscosity and water evolution rate of the slurry.Combined with the actual grouting site,the viscosity reduction test is designed.The results showed that the three factors of volume concentration,gangue particle size,fly ash and gangue mass ratio all played a significant role in the change of slurry density and slurry viscosity.Among them,gangue quality accounts for 70%of the quality will make the viscosity of the slurry increase faster;the volume concentration and the quality of fly ash and coal gangue play a major role in the change of slurry water evolution rate,of which the quality of coal gangue in different proportions has differences in the speed of change of water evolution rate.Gangue particle size plays a secondary role in the change of slurry water evolution rate;the increase in the content of polyhydroxylic acid superplasticizer has a significant effect on the reduction of viscosity of fly ash slurry and fly ash gangue mixed slurry,and gradually slows down to the extreme value with the increase of the dose.