城市疏浚和建设过程中产生的高含水率淤泥具有高流动性的典型特点，导致此类淤泥运输、周转都极为不便。开展了利用高吸水材料改善淤泥流动性的试验，研究结果表明，淤泥的流动性随着含水率的升高而显著上升，曲线拟合结果显示两者之间近似成二次函数关系。通过添加较少量的高吸水材料就可以使淤泥的流动性迅速降低到非常利于运输和周转的程度；引入“净流动值”定量地描述高吸水材料对淤泥流动性的改善效果，不同初始含水率的淤泥在添加一定比例的高吸水材料后其“净流动值”降低比例处于相同水平；高吸水材料对淤泥流动性的改善效果在极短时间内可以得到显著体现，未进行充分搅拌混合的情况下淤泥流动值改善就已接近最优值，搅拌的持续时间和强度对淤泥流动性改善效果并无明显影响，工程应用时的工作耗时和工作强度将会明显降低。

High water content silt in urban dredging and construction process has high liquidity typical characteristics which may lead to extremely inconvenient in transport and turnover. Carrying out the experimental study of decreased flow ability of silt by using high water absorbent material. The results show that flow ability of silt increased with moisture content rise, the mathematics model of flow ability and moisture content is got from the curve fitting of the test results which is quadratic function. A little cost of high water absorbent material can obtain the good effects on decreasing silt flow ability to an appropriate level that is very conducive to transport and turnover. The net flow value is introduced to quantitatively describe improvements of silt’s flow ability caused by high water absorbent materials. The net flow value of silts with different initial water contents would reduce at an identical ratio level when added high water absorbent material. The result for decreasing flow ability by adding high water absorbent material is immediately obvious. In the case of low mixing uniformity with high water absorbent material and silt, the decreased flow value of silt is close to optimum. Mixing duration and intensity have little Impacts on the flow ability of the silt. Time consuming and work intensity would reduce obviously when it’s taken to engineering application.