双卧轴振动搅拌对超高性能混凝土性能的影响研究

Research on the effect of the double-horizontal-shaft vibrating mixing on the performance of ultra-high performance concrete

【目的】以双卧轴振动搅拌机为研究对象,分别采用仿真和试验方式对比分析振动搅拌对超高性能混凝土材料性能的影响。【方法】首先,建立双卧轴振动搅拌机三维立体模型;然后,将其导入EDEM仿真软件进行仿真分析,在保证所建模型能使物料充分混合的前提下,设计了一组非振动搅拌与振动搅拌的对比研究,利用EDEM的后处理功能,对搅拌结束的物料运动轨迹及材料的均匀度随时间的变化规律进行分析;最后,通过现场试验测试了成品混合料的力学性能。【结果】仿真结果证明:在转速相同的情况下,搅拌结束时振动搅拌方式下混合料的离散系数为0.186,非振动搅拌混合料的为0.247,振动搅拌使混合料的匀质性提高了25%。预混料与非预混料的工程试验结果表明:与非振动搅拌相比,振动搅拌后混合料的延展性提高了7.4%~16.2%,塌落度增大了3~5 mm,匀质性提高了21%。【结论】整体而言,对于超高性能混凝土的制备,振动搅拌效果更好。

[Purposes]In this paper,the impact of vibratory agitation on the properties of ultra-high-performance concrete materials is compared and analyzed by simulation and experimental methods.[Methods]First of all,the three-dimensional model of the double-horizontal shaft vibratory mixer is established.Then,the EDEM simulation software is introduced for simulation analysis.Under the premise of ensuring that the model can make the material fully mixed,a set of non-vibration stirring and vibration stirring are designed to comparation and study.With the post-processing function of EDEM,the material movement trajectory and matrial uniformity at the end of the mixting are analyzed with time.Finally,physical properties of the blended material are tested through field tests.[Findings]Based on the same speed,simulation results show that the blended material dispersion coefficient of vibratory stirring is 0.186 and the non-vibration stirring is 0.247 at the end of production,and the uniformity of the mixture is improved by 25%.Comparing with the non-vibratory stirring,the engineering test results of the premix and the non-premix show that the expansion degree is increased by 7.4%-16.2%,the collapse degree is increased by 3-5 mm,and the uniformity is increased by 21%.[Conclusions]Overall,the vibration stirring effect is better for ultra-high performance concrete preparation.