河道淤泥电渗-固化室内试验研究

为达到河道淤泥的排水减量和加固强度要求，缩短加固处理工期、降低综合处理成本，进行单一电渗、单一固化、模拟电渗-固化的室内对比试验，研究不同通电电流、不同固化剂掺入比、固化龄期等因素对宁波河道淤泥加固效果的影响。同时结合扫描电镜探究了加固土的微观特征变化，并进行加固机理分析。研究结果表明：采用较低的通电电流可降低综合处理成本、处理效果更均匀；固化剂掺入比在6%~10%的范围内，掺入比越高，电渗-固化联合处理相对于采用单一固化加固能够提升的强度幅度更明显；采用相同的固化剂掺入比，电渗-固化联合处理更有利于胶结物和水化产物的生成，电渗排水作用对固化土后期强度增长起到重要作用。

Laboratory tests of electroosmosis-solidification on river sludge

 In order to meet the requirement of moisture reduction and reinforcement strength for river sludge, as well as to shorten the treatment duration and reduce the comprehensive cost, the comparative laboratory tests of electroosmosis, solidification, and simulated electroosmosis-solidification are conducted. The reinforcement effects of Ningbo river sludge are studied with different electric current, different mixing ratios of solidification agent, different curing ages. Meanwhile, the micro-characteristic changes of reinforced sludge are explored by scanning electron microscope (SEM) and the reinforcement mechanism is analyzed. The results show that adopting a lower electric current can reduce the comprehensive cost and achieve the more uniform treatment effect. In the range of 6%~10% on mixing ratio of curing agent, the higher the mixing ratio, the more obvious the strength increasement for electroosmosis-solidification than that of single solidification reinforcement. When adopting the same mixing ratio of curing agent, the electroosmosis-solidification treatment is more conducive to form the cements and hydration products, and the drainage effect of electroosmosis plays an important role in the later strength growth of solidified sludge.