抽采钻孔护孔泡沫混凝土配合比试验研究

Experimental study on mix proportion of foam concrete for drainage hole protection

为了探究自主研制的抽采钻孔护孔泡沫混凝土材料各组分及水灰比对泡沫混凝土支护性能和渗透性能的影响,采用多因素多水平正交的试验方法和响应面分析的分析方法,研究了水灰比、粉煤灰添加量以及粉煤灰粒度与泡沫混凝土抗压强度和渗透率的之间关系,得到了各个因素与抗压强度和渗透率的二次型模型,确定了各因素对泡沫混凝土抗压强度和渗透率的显著性大小,并得出了最佳配合比。结果表明:通过响应曲面分析得到了试验变量水灰比、粉煤灰掺量、粉煤灰粒度与抗压强度和渗透率的二次模型,且拟合效果良好;通过方差分析和显著性检验了各因素对材料抗压强度的影响大小:水灰比>粉煤灰添加量>粉煤灰粒度;对材料渗透率的影响大小:粉煤灰粒度>粉煤灰掺量>水灰比;通过响应面分析法得到了该试验条件下最佳的配合比为水灰比0.6、粉煤灰掺量40%、粉煤灰粒度1663目。

In order to explore the influence of components and water cement ratio on the performance and permeability of the foam concrete,the relationship between the water cement ratio,the amount of fly ash and the particle size of fly ash and the compressive strength and permeability of the foam concrete is studied.By the two order model of various factors and compressive strength and permeability,the remarkable size of each factor on the compressive strength and permeability of the foam concrete was determined,and the best mixture ratio was obtained.The results show that the secondary model of water cement ratio,fly ash content,fly ash particle size,compressive strength and permeability is obtained by response surface analysis,and the fitting effect is good.The influence of each factor on the compressive strength of the material is small and large by variance analysis and significance test,water cement ratio>fly ash addition>fly ash particle size.The influence on the permeability of the material is large and small.The results of response surface analysis show that the best ratio of fly ash to water is 0.6,40%and 1663 mesh.