改性搅拌站废浆在水泥基材料中的再利用研究

Research on the reusing of modified mixing plant waste slurry in cementitious materials

为研究搅拌站废浆(以下简称废浆)在水泥基材料中再利用的可行性,用自主研发的废浆改性剂对废浆进行了改性处理,研究了未改性和改性废浆对湿拌砂浆、混凝土工作性及力学性能的影响,并通过热重法(TG-DTG)分析了改性废浆对胶凝材料水化的影响。结果表明:改性剂延缓了废浆的凝结时间,使废浆保持较高的活性;与未改性废浆相比,掺入改性废浆使湿拌砂浆的8 h稠度损失率降低,凝结时间延长,抗压强度提高;改性废浆的掺入提高了混凝土的工作性及抗压强度。改性废浆再利用具有一定的经济效益。

In order to study the feasibility of reusing waste slurry from mixing plant in cementitious materials,a self-developed waste slurry modifier was used to modify the waste slurry,and the effects of unmodified and modified waste slurry on the workability and mechanical properties of wet-mixed mortar and concrete were studied,and the effects of modified waste slurry on hydration of cementitious materials were analyzed by thermogravimetric(TG-DTG).The results show that the modifier delays the setting time of the waste slurry and maintains the waste slurry with high activity.Compared with the unmodified waste slurry,the addition of modified waste slurry reduces the 8 h consistency loss rate of wet-mixed mortar,prolongs the setting time,and increases the compressive strength.The addition of modified waste slurry improves the workability and compressive strength of concrete.Modified waste slurry reuse has a certain economic effect.