摘要
不锈钢-碳钢复合钢筋是一种由碳钢芯筋和不锈钢覆层组成的新型耐腐蚀钢筋。通过热轧等工艺实现两者的冶金结合,使其兼有芯筋的强度和覆层的耐腐蚀性能,在实际工程中有广阔的应用前景。以S30408不锈钢-HRB400碳钢复合钢筋为研究对象,根据钢筋真实服役状态设计了均匀腐蚀、覆层破损腐蚀和非均匀腐蚀三种腐蚀类型。通过电流加速腐蚀试验得到了三种腐蚀形态的不锈钢-碳钢复合钢筋试样,并对以上试样进行单调拉伸试验。研究表明:腐蚀导致不锈钢-碳钢复合钢筋力学性能呈线性下降。腐蚀后试件的应力-应变曲线形态也发生改变。其中,覆层破损腐蚀试样的屈服平台消失最早发生。通过预测模型定量地描述了三种腐蚀形态的不锈钢-碳钢复合钢筋的力学性能和韧性的演化规律,并可以预测任一腐蚀程度下三种腐蚀形态的不锈钢-碳钢复合钢筋的力学性能和韧性。最后根据试验结果和GB/T 1499.2—2018的要求,建议不锈钢-碳钢复合钢筋的腐蚀程度限制在10.7%以内,以保证结构的服役性能。
The stainless-clad bimetallic steel bar(SCBSB)is a new type of weather-resistant steel bar composed of carbon steel core bars and stainless-steel cladding.The metallurgical combination of the two is realized through hot rolling and other processes,so that it has both the strength of the core bar and the corrosion resistance of the cladding,which has broad prospects in practical engineering applications.Taking SCBSB which is consisted with the S304 stainless steel as the cladding and the HRB400 carbon steel bar as the substrate as the research object,according to the actual service state of reinforcement,three types of corrosion are designed,that’s,uniform corrosion,damaged cladding corrosion and non-uniform corrosion.Three types of corrosion forms of SCBSB samples were obtained by electrochemical accelerated corrosion test.Then the tensile test was performed on the above samples.The research had shown that the mechanical properties of SCBSB decreased linearly due to corrosion.The characteristic of stress-strain curve also changed after three forms of corrosion,of which the disappearance of the yield platform of the damaged cladding corrosion sample occurred first.The evolution law of mechanical properties and toughness of SCBSB with three corrosion forms was quantitatively described by prediction models,which could predict the mechanical properties and toughness of SCBSB with three corrosion forms at any degree of corrosion.Finally,according to the test results and the requirements of GB/T 1499.2—2018,the paper suggested that the corrosion degree of SCBSB should be controlled below 10.7%to ensure the service performance of the structure.
作者
华建民
胡国松
王斐
薛暄译
王能
HUA Jianmin;HU Guosong;WANG Fei;XUE Xuanyi;WANG Neng(School of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area,Chongqing University,Chongqing 400045,China;School of Management Science and Real Estate,Chongqing University,Chongqing 400045,China)
出处
《工业建筑》
北大核心
2023年第5期179-186,共8页
Industrial Construction
基金
国家自然科学基金青年科学基金项目(52108115)。
关键词
不锈钢-碳钢复合钢筋
腐蚀形态
力学性能
韧性
stainless-clad bimetallic steel bars
corrosion form
mechanical properties
toughness
