Research on Engineering Education and Management of Early-Strength Sludge Fluidized Soil Used for Backfilling of Pipes and Trenches of Polluted Water

In order to resourcefully utilize the sludge generated every year, guarantee the backfilling quality of pipes and trenches of polluted water, and accelerate the construction progress, as well as reduce the cement usage amount to lower the engineering costs, the experiment was carried out to prepare the early strength sludge fluidized soil by replacing sulphoaluminate cement with slag in equal amount. Through exploring the influence of different sludge moisture contents and slag replacement rates on the fluidity and filling ability of fluidized soil, and analyzing the influence of different sludge moisture contents, slag replacement rates and periods on the compressive strength of fluidized dynamic soil, it is inferred that the fluidity of the fluidized soil increases linearly with the increase of the moisture content of sludge and remains basically unchanged with the changes of the slag replacement rate. The compressive strength decreases linearly with the increase of sludge moisture content and slag replacement rate, and increases with the increase of period. The filling rate of fluidized soil can reach over 97%, which can solve the backfilling quality problem of pipes and trenches of polluted water better.