严寒地区垃圾渗滤液对混凝土耐久性的影响

Influence of Landfill Leachate on Durability of Concrete in Severe Cold Aarea

我国以垃圾填埋为主的垃圾处理方式产生了大量的垃圾渗滤液。研究表明,垃圾渗滤液对混凝土的耐久性有巨大的影响,特别是在我国北方的严寒地区,这一影响因素会被放大。综合国内外研究现状发现,在诸多影响因素中,冻融是影响严寒地区混凝土构筑物耐久性的一个主导性因素,它会使微生物、盐离子等有害物质更容易进入混凝土构筑物的内部,多种因素的叠加会对混凝土构筑物的使用寿命造成严重折减。当前,对于冻融、微生物和盐离子等单因素侵蚀机理的研究已取得颇多成果,但是对于多种因素耦合作用的机理和相关模型建立的研究还不够充分。未来应着重研究多因素耦合的侵蚀机理,以期为严寒地区实际工程的建设和防护提供更好的理论支撑。

A large amount of landfill leachate has been produced in China. The research shows that landfill leachate has a great impact on the durability of concrete, especially in the severe cold areas in northern China. Based on the research status at home and abroad, it is found that among many influencing factors, freezing and thawing is a leading factor affecting the durability of concrete structures in severe cold areas. It will make it easier for harmful substances such as microorganisms and salt ions to enter the interior of concrete structures. The superposition of various factors will seriously reduce the service life of concrete structures. At present, many achievements have been made in the research on the single factor erosion mechanism such as freeze-thaw, microorganisms and salt ions, but the research on the mechanism of multi factor coupling and the establishment of relevant models is not enough. In the future, we should focus on the multi factor coupling erosion mechanism, in order to provide better theoretical support for the construction and protection of practical projects in severe cold areas.