碱激发粉煤灰和矿粉固化淤泥的胶结体孔隙分布特征

通过压汞试验分析得到进汞曲线和孔径分布密度曲线,采用直剪试验、承载比试验测定固化淤泥胶结体的力学性质。提出采用孔隙分布系数(η)表征固化淤泥的胶结体孔隙分布的均匀程度,建立了固化淤泥的胶结体孔隙分布系数与抗剪强度指标和CBR值之间的定量关系。结果表明,固化淤泥的胶结体孔隙分布系数与其力学指标具有密切的相关性。孔隙分布系数越小,固化淤泥的胶结体孔隙分布越均匀,抗剪强度越高,CBR值越高;孔隙分布系数越大,固化淤泥的胶结体孔隙分布越不均匀,抗剪强度和CBR值越低。

Pore distribution characteristics of dredged sludge cementation body solidified with fly ash and mineral power under alkali stimulated conditions

Curves of mercury injection and pore distribution density of alkali-activated dredged sludge cementation body solidified with fly ash and mineral powder were obtained by mercury intrusion porosimetry (MIP) test, and its shear strength indexes were measured by direct shear test and bearing ratio test. It''s proposed to use pore distribution coefficient to characterize the uniformity of pore distribution of the cementation body, and the quantitative relationships between the pore distribution coefficient and the shear strength index and CBR values were established, respectively. The results show that the pore distribution coefficient of the cementation body is closely related to its mechanical indexes. The smaller the pore distribution coefficient is, the more uniformly the pores of the cementation body distributes, and the higher the shear strength index and CBR are, whereas the bigger the pore distribution coefficient is, the less uniformly the pores of the cementation body distributes, and the lower the shear strength index and CBR are.