摘要
为满足严重腐蚀环境下混凝土灌注桩的工作、力学及耐久性能,本文进行了混凝土灌注桩制备技术试验研究,得出以下结论:(1)采用坍落度保留值、倒坍落度筒流出时间等指标来评价灌注桩混凝土的性能,建立包括力学、工作和耐久性的灌注桩混凝土性能评价指标体系;(2)采取降低混凝土粉煤灰与矿渣粉复掺、用水量,适当引气的混凝土制备技术途径,可制备出性能高(坍落扩展度550mm)、抗腐蚀的灌注桩混凝土;(3)在灌注桩混凝土中通过添加阻锈剂作为防腐蚀强化措施,阻锈剂应考虑其对混凝土工作、力学性能以及对钢筋保护性能的影响。
In order to meet the working and mechanical properties and durability of cast-in-place concrete pile under severely corrosive conditions,this paper makes an experimental study on the technology of preparing cast-in-place concrete pile,and draws the following conclusions:(1)The concrete performance of cast-in-place pile is evaluated by indicators such as slump retention value and inverted slump cone outflow time,and an evaluation matrix for the concrete performance of cast-in-place pile including mechanical and working properties and durability is established.(2)The cast-in-place pile concrete with high performance(slump spread of 550 mm)and corrosion resistance can be prepared by reducing the proportion of fly ash and slag powder in concrete,water usage,and appropriate air-entraining for concrete preparation.(3)Corrosion inhibitor may be added to cast-in-place pile concrete as an anti-corrosion strengthening measure,and its influence on the working and mechanical properties of the concrete,and reinforcing bar protection shall be considered.
作者
陈思孝
王波涛
CHEN Sixiao;WANG Botao(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《高速铁路技术》
2021年第6期42-46,共5页
High Speed Railway Technology
关键词
腐蚀环境
灌注桩
制备技术
耐久性能
评价指标
corrosive condition
cast-in-place pile
preparation technology
durability
evaluating index
