- 目录
- 化学建材
- 首页
适用于高原地区钢管自密实混凝土的高稳健性减水剂研究
作者：王睿1，魏志强1，戴胜勇2，王毅3，4，徐文3，4
（1.中国铁路总公司拉林铁路建设总指挥部，西藏 林芝 860114；2.中国中铁二院工程集团有限责任公司，四川 成都 610031；
3.东南大学 材料科学与工程学院，江苏 南京 211189；4.高性能土木工程材料国家重点实验室，江苏 南京 211103）
摘要：管内混凝土灌注是钢管混凝土拱桥建造过程的关键。依托新建拉林铁路藏木特大桥工程，针对高原地区优质材料匮乏、施工时温差大等难题，研究提出了管内高稳健性自密实混凝土工作性能控制指标及其测试方法，并基于疏水缔合型与缓控释型高聚物分子构筑，研发了高稳健性聚羧酸减水剂，相比普通聚羧酸，显著提升了管内自密实混凝土工作性能稳健性及其经时保持性，削弱了材料、气温等因素波动带来的影响，符合设计与施工要求。
关键词：钢管混凝土拱桥；自密实混凝土；聚羧酸减水剂；稳健性；疏水缔合；缓控释
中图分类号：TU528.042+.2 文献标识码：A 文章编号：1001-702X（2019）09-0009-05
Study on a high robust water reducer in self-consolidating concrete filled steel tube in the highland area
WANG Rui1，WEI Zhiqiang1，DAI Shengyong2，WANG Yi3，4，XU Wen3，4
（1.Lalin Railway Construction Headquarters of China Railway Corporation，Linzhi 860114，China；
2.China Railway Eryuan Engineering Group Co. Ltd.，Chengdu 610031，China；
3.School of Materials Science and Engineering，Southeast university，Nanjing 211189，China；
2.China Railway Eryuan Engineering Group Co. Ltd.，Chengdu 610031，China；
3.School of Materials Science and Engineering，Southeast university，Nanjing 211189，China；
4.State Key Laboratory of High Performance Civil Engineering Materials，Nanjing 211103，China）
Abstract：The core concrete filling is the key to the construction of concrete-filled steel tubes arch bridge. This paper presents a control system for the workability of core self-consolidating concrete with high robustness and its test methods，which aim at tackling the problems of a shortage of high-quality raw materials and a wide temperature difference during placing in the construction of Lalin Railway Zangmu Bridge in the Qinghai-Tibet Plateau. A new type of high robustness polycarboxylate water reducer was developed based on the hydrophobic associating and sustained or controlled release high polymer molecules construction. This new type of polycarboxylate water reducer improved the workability robustness of the core self-consolidating concrete and weakened its susceptibility to variable raw materials，temperatures and other factors compared with conventional polycarboxylate water reducers，which has satisfied the demand of design and construction well.
Key words：concrete-filled steel tubes arch bridge，self-consolidating concrete，polycarboxylate superplasticiaer，robustness，hydrophobic association，sustained or controlled release