关键词: 液限, 新拌固化淤泥, 含水率, 流动性, 黏滞性

Abstract:

Fluidized solidified mud can be used in foundation trench, road base and other casting projects, its mobility is an important factor to ensure the construction quality, but the lack of systematic research on the mobility of freshly mixed solidified muds with different liquid limits, it is of great practical significance to carry out the relevant research. In this study, flowability and viscosity tests were conducted on muds and freshly mixed fluidized solidified muds with six different liquid limits (w_L = 27.2%-62.0%), revealing the influence of curing material content, water content, and liquid limit on the rheological properties of muds and freshly mixed fluidized solidified muds, and methods for calculating the flowability and viscous shear force were developed. The study shows that: the adding of curing materials makes the fluidity of freshly mixed solidified mud decrease obviously, but the decrease slows down after the dosage exceeds 5%, and the fluidity basically stays unchanged after exceeding 10%; the larger the initial water content is, the better the fluidity of freshly mixed solidified mud is; the less change in fluidity were observed in the solidified mud when the water content is near w_L, and the fluidity of the solidified mud increases obviously after exceeding a certain number of times of w_L; the smaller the w_L is, the larger the value is; but when the water content exceeds a threshold, the growth rate of flowability slows down, and the flowability is positively correlated with the w_L. On this basis, a power function relationship between the flowability of mud/freshly-mixed solidified mud and w_L was proposed, and a hyperbolic model for computing shear force of freshly mixed solidified mud with different w_L was established. The results can provide a reference for the design and construction of freshly mixed solidified mud.

Key words: liquid limit, freshly mixed solidified mud, moisture content, mobility, viscosity