严重腐蚀环境下混凝土灌注桩制备技术研究-《高速铁路技术》

文章信息/Info

Title:: A Study on the Technology of Preparing Cast-in-place Concrete Pile under Severely Corrosive Conditionst

Author(s):: CHEN Sixiao; WANG Botao; China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China

Keywords:: corrosive condition|cast-in-place pile|preparation technology|durability|evaluating index

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550 mm）、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。

Abstract:: 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.