UHPC钢纤维定向排列布料机在钢桥面铺装中的应用研究

作者:王强 过震文
单位:上海市市政规划设计研究院有限公司
摘要:钢纤维定向排列已被证实可实现UHPC在钢纤维排列方向上抗拉性能的进一步提升。根据现有阶段成果,试制UHPC钢纤维定向排列布料机。考察UHPC材料在经过布料机挤压布料后的工作性能影响,以及对比UHPC分别沿顺着布料机浇筑方向、横着布料机浇筑方向和标准浇筑方向的抗折强度大小。试验结果表明,UHPC布料机基本不改变拌合物的性能,而对钢纤维的排列方向有一个很大程度的取向排列,其中,顺着浇筑方向的抗折强度达到32.2MPa,这一结果从试件断裂面钢纤维的排列方向上得到验证。基于这一研究成果,将其应用在润扬大桥钢桥面铺装维修工程中。
关键词:桥梁工程超高性能混凝土布料机抗折强度钢纤维
作者简介:王强,高级工程师,E-mail:204748@163.com。
基金: -页码-:81-84
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Application of UHPC Steel Fiber Oriented Arrangement Spreader in Steel Deck Pavement
WANG Qiang GUO Zhenwen
(Shanghai Municipal Planning and Design Institute Co.,Ltd.)
Abstract: The directional arrangement of steel fibers is proved to be able to further improve the tensile properties of UHPC in the direction of steel fibers alignment. According to the results of the current stage,the UHPC steel fiber oriented arrangement spreader is trial-produced. The influence of UHPC workability after extrusion was investigated,and the flexural strength of UHPC along the pouring direction,vertical direction,and standard direction was compared. The test results show that UHPC distributor basically does not change the properties of the mixtures,but has a lot to change the orientation of steel fibers. The flexural strength along the direction of pouring direction reaches 32. 2 MPa,which is verified by the direction of steel fibers arrangement on the fracture surface of the specimens. Based on this research result,it is applied to the maintenance engineering of steel deck pavement of Runyang Bridge.
Keywords: bridges; ultra-high performance concrete; spreader; flexural strength; steel fiber
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