桥梁转体球铰支座用活性粉末混凝土试验研究

作者：樊立龙¹’²,张京京³,李志辉¹,石庆波³,王海良⁴

作者单位：

樊立龙,正高级工程师,E-mail:30102472@ qq. com

作者简介：

1. 中国铁建大桥工程局集团有限公司,天津 300300; 2. 天津市装配式桥梁智能建造技术与装备重点实验室,天津 300300; 3. 中铁十八局集团有限公司,天津 300222; 4. 天津城建大学,天津 300384

基金项目：

∗国家“十四五”重点研发计划:大温差强辐射大风干燥环境下桥梁墩台塔柱现浇混凝土性能演变规律及劣化机理研究(2021YFB3701-03);天津市轨道交通重大专项:轨道交通装配式连续梁产业化关键技术研究(18ZXGDGX00050);中国铁建大桥工程局集团有限公司:2200t 起重船吊装大节段钢梁关键技术研究(DQJ-2022-B04)

摘要：

为提高活性粉末混凝土(RPC)的流动性,开展桥梁转体球铰支座用 RPC 材料试验. 通过控制变量法,研究RPC 性能的基础配合比,探讨矿物掺合料、钢纤维及减水剂掺量对 RPC 性能的影响. 结果表明:矿粉、硅灰适量替代水泥掺加到 RPC 体系,能充分发挥微集料填充效应及火山灰活性,提高体系抗压强度,矿粉与硅灰最佳掺量分别为 45,20kg / m3;钢纤维的掺加能大幅度提高 RPC 抗压强度,钢纤维最佳掺量为 75kg / m3;减水剂在 RPC 中作用机理主要表现为静电斥力与空间位阻,减水剂最佳掺量为 1.8kg / m3;通过最优试验配合比测试,RPC 材料综合性能满足桥梁转体球铰支座应用要求.

关键词：桥梁;混凝土;球铰支座;矿物掺合料;钢纤维;减水剂;流动性;力学性能

English：

In order to improve the flowability of reactive powder concrete (RPC), experiments wereconducted on RPC materials used for bridge swivel ball joint bearings. By using the method of controllingvariables, the basic mix proportion of the RPC system is studied, and the effects of mineral admixtures,steel fibers, and water reducr on the RPC performance are explored. The results show that addingappropriate amounts of mineral powder and silica fume instead of cement to the RPC system can fullyexert the filling effect of micro aggregates and the activity of volcanic ash, improve the compressivestrength of the system, and the optimal dosage of mineral powder and silica fume is 45kg / m3and 20kg / m3respectively. The addition of steel fibers can significantly improve the compressive strength of RPC, andthe optimal amount of steel fibers is 75kg / m3. The mechanism of action of water reducer in RPC mainlymanifests as electrostatic repulsion and steric hindrance, and the optimal dosage of water reducer is1.8kg / m3. Through the optimal experimental mix ratio test, the comprehensive performance of RPCmaterial meets the application requirements of bridge swivel ball joint bearings.

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混凝土 > 2024年 第53卷 第10期