摘要
为了改善武汉东湖疏浚淤泥的物理力学性能,在传统水泥固化处理方法的基础上,掺入外加剂氢氧化钠(NaOH)和石膏,对100多组淤泥固化土试样进行了室内无侧限抗压强度试验,进行固化效果和固化机理的分析。结果表明:在疏浚淤泥固化过程中水泥占主导地位,对固化效果影响最为显著;NaOH促进了水泥的水化作用,增强了淤泥固化土的无侧限抗压强度,表现在固化淤泥早期强度的快速提高;石膏有利于固化淤泥早期强度的形成,其作用持续于整个淤泥固化过程。在水泥掺入比一定时,NaOH和石膏都存在最佳掺量,超过了最佳掺量,强度就会降低。3种固化剂的正交试验得出最佳配比为实际工程的应用提供依据。
In order to improve the physical and mechanical properties of dredged silt of East Lake in Wuhan, on the basis of traditional cement solidification processing method, with samples mixed with admixture sodium hydroxide（NaOH） and plaster, indoor uneonfined compressive strength tests of more than 100 groups of samples are carried out, and the curing effect and curing mechanism are analyzed. Results show that the role of cement is the dominant additive during solidification of sludge; the NaOH promotes the cement hydration, enhancing the unconfined compressive strength of solidified silt soil, and the early strength of solidified silt has been increased rapidly; the gypsum is conducive to the early strength formation of solidified sludge, and its role is shown throughout the solidifying process continuously. When cement mixing ratio is constant, there is the best dosages of both NaOH and gypsum. If the contents exceed the best volumes, the strength of the solidified soil decreases. The optimum mixture ratios are derived by the orthogonal tests of the three kinds of euring agents, providing for the basis for practical engineering applications.
出处
《建筑科学》
北大核心
2014年第9期51-55,共5页
Building Science
基金
湖北省自然科学基金青年杰出人才项目(项目编号:2011CDA105)
关键词
疏浚淤泥
固化土
外加剂
无侧限抗压强度
固化机理
dredging silt
stabilized soil
additional agent
unconfined compressive strength
curing mechanism
