基于响应面法的水泥-粉煤灰-矿粉浆体流变分析

Rheological analysis of cement-fly ash-ore slurry based on response surface method

为探究粉煤灰与矿粉复掺对水泥浆体流变性能的影响,采用粉煤灰与矿粉等质量替代水泥的方法制备试验浆体,探讨粉煤灰与矿粉质量比和水胶比对浆体粘度、流动度、水膜厚度的影响,并采用响应面分析法探究两个变量对于浆体各性能的影响作用。结果表明:水胶比为0.5,粉煤灰与矿粉质量比为0.142时可大幅度(76.27%)提高浆体的粘度。粉煤灰掺量越大,浆体粘度越小、流动度与水膜厚度越大,矿粉掺量越大,浆体粘度越大,流动度与水膜厚度越小。结合响应面分析,水胶比对浆体流变性的影响作用大于粉煤灰与矿粉质量比,因此,在固定水胶比下,可通过改变粉煤灰与矿粉质量比来对浆体的流变性进行改善。

In order to explore the influence of fly ash and granulated blast furnace slag mixed on rheological properties of cement slurry,the test slurry was prepared by using the method of replacing cement with the same quality as fly ash and granulated blast furnace slag.The effects of mass ratio of fly ash to granulated blast furnace slag and water-binder ratio on slurry viscosity,fluidity and water film thicken were discussed,and response surface methodology was used to explore the effects of two variables on slurry properties.Results show that the viscosity of slurry can be greatly increased(76.27%)when water-binder ratio is 0.5 and mass ratio of fly ash to granulated blast furnace slag is 0.142.The greater fly ash content,the smaller slurry viscosity,and greater fluidity and water film thickness,the greater granulated blast furnace slag content,the greater slurry viscosity,and smaller fluidity and water film thickness.Combined with response surface analysis,the effect of water-binder ratio on rheology of slurry is greater than mass ratio of fly ash to granulated blast furnace slag.Therefore,at a fixed water-binder ratio,the rheology of slurry can be improved by changing mass ratio of fly ash to granulated blast furnace slag.