摘要
通过现场调研了解到驼峰车辆减速器轨道板存在边角破损、表面麻面、细小裂纹等外观质量问题。对上述问题的成因进行分析,确定了影响轨道板外观质量的主要因素为水胶比、振捣功率、脱模剂和养护工艺等。通过设计对比试验,验证了这些因素与轨道板外观质量的关系,结合对比试验结果确定了合适的水胶比、振捣功率、脱模剂和养护工艺等。试验结果表明:水胶比控制为0.3可以兼顾原材料的流动性和成品的抗压强度;提高振捣功率和选用合适的脱模剂,有利于降低表面气孔比率;采用蒸汽养护、浸水和喷淋的组合养护工艺,有利于减少表面细小裂纹。在实际生产过程中,轨道板边角破损得到有效控制,表面气孔面积比率降低约5%,收缩率降低约20%,有效减少轨道板表面麻面和细小裂纹情况,轨道板外观质量得到有效提升。
Through on-site investigation,it was known that the hump vehicle retarder track slabs had appearance quality problems such as corner damage,surface voids and pits and fine cracks.The causes of the problems above were anylyzed,and the main factors affecting the appearance quality of the track slab were the water-binder ratio,vibration power,release agent and curing process.Through the comparison tests,the relationship between these factors and the appearance quality of track slab was verified.The test results show that adjusting the water-binder ratio to 0.3 can both control the fluidity of raw materials and the compressive strength of finished products;Increasing vibration power and selecting suitable release agent are beneficial to reduce surface porosity ratio;The combined curing process of steam curing,immersion and spraying is conducive to reducing fine cracks on the surface.Combined with the comparative tests results,the appropriate water-binder ratio,vibration power,release agent and curing process were determined,and in the actual production process,the corner damage of the track slab has been effectively controlled,the surface porosity ratio has been reduced by about 5%,the shrinkage rate has been reduced by about 20%,the surface voids and pits and fine cracks of the track slab have been effectively reduced.In summary,the appearance quality of the track slab has been improved.
作者
张喆
甄宇阳
刘文君
ZHANG Zhe;ZHEN Yuyang;LIU Wenjun(Shenyang Railway Industry Group Corporation Limited,Shenyang Liaoning 110000,China;Signal and Communication Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Wuhan Electricity Services Department,China Railway Wuhan Group Corporation Limited,Wuhan Hubei 430000,China)
出处
《高速铁路新材料》
2023年第3期49-53,共5页
Advanced Materials of High Speed Railway
基金
中国铁道科学研究院集团有限公司通信信号研究所基金项目(2020HT07)。
关键词
车辆减速器轨道板
外观质量
水胶比
混凝土收缩率
vehicle retarder track slab
appearance quality
water-binder ratio
shrinkage rate of concrete
