混凝土搅拌站废水在混凝土中的利用现状

Reviewon utilizations of mixing plant wastewater in concrete

搅拌站废水的合理利用是搅拌站绿色生产和管理星级评价的主要指标之一,但合理有效利用一直是一个技术难题。综述了废水的性质和处理工艺,并探讨废水掺量或浓度、缓凝组分、离子浓度与混凝土性能的关系,发现废水掺量或浓度是目前考虑最多的因素,较高的废水掺量或浓度会造成凝结时间缩短和流动性及强度明显降低;废水掺量和浓度变化对混凝土性能的影响最终可以归结为所掺加废水中总固含量的影响;更有效废水处理工艺设计是必须的,同时废水中离子浓度随时间的变化以及对混凝土的性能的影响有待研究。这些工作的开展对于进一步推进搅拌站废水利用具有重要意义。

The effective utilization of concrete mixing plant wastewater as a key star evaluation indicator of green production and management is a main technical problem.The characters and treatment process of wastewater and the effects of the amount or concentration,retarding component and ion concentration in wastewater were summarized.The amount and concentration of wastewater are main factors often considered.High amount or concentration will decrease concrete flowability and strength.The effect of wastewater amount and concentration on concrete properties can be ascribed to the effect of solid content in wastewater.More effectively wastewater treatment process is in need of designing.It need to study the change in concentrations of main ions in wastewater with time and their effects on the performance of concrete.Those studies will favor to more effective utilizations of wastewater in concrete.