钢绞线加速锈蚀及其力学性能试验研究
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摘要
钢绞线作为一种常用的预应力结构材料,其耐久性性能的优劣受到诸多因素的影响,其中,环境因素造成的锈蚀使得钢绞线力学性能退化,严重降低其耐久性。本文通过实验,对沿用在钢筋中的锈蚀定律加以修正;并利用修正后的锈蚀经验公式,对钢绞线加速锈蚀实验进行分析;不同腐蚀速率为1%～9%的试样由30根长度为100 cm的钢绞线制成。静态拉伸试验用于获得腐蚀钢绞线的机械性能随腐蚀速率的变化,从而为实际工程中的吊杆及拉索结构耐久性评估提供依据。
As a common prestressing structural material, the durability of steel strand has affected by many factors. Corrosion will lead to degradation of mechanical properties of steel strand and further reduce its durability. Corrosion formula used in reinforced accelerated corrosion was amended through the experiments; Steel strand accelerated corrosion test was carried out according to the revised experience formula; the static tensile test of corroded steel strand was carried out, too. Static mechanical properties with the corrosion rate of corroded steel strands were conducted. The results could provide further reference for durability evaluation of suspenders and cable structures.
As a common prestressing structural material, the durability of steel strand has affected by many factors. Corrosion will lead to degradation of mechanical properties of steel strand and further reduce its durability. Corrosion formula used in reinforced accelerated corrosion was amended through the experiments; Steel strand accelerated corrosion test was carried out according to the revised experience formula; the static tensile test of corroded steel strand was carried out, too. Static mechanical properties with the corrosion rate of corroded steel strands were conducted. The results could provide further reference for durability evaluation of suspenders and cable structures.
引文
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[2]李富民,袁迎曙,杜健民,等.氯盐腐蚀钢绞线的受拉性能退化特征[J].东南大学学报:自然科学版,2009,39(2):340-344
[3]郑亚明,欧阳平,安琳.锈蚀钢绞线力学性能的试验研究[J].现代交通技术,2005(6):33-36
[4]吴雪峰.锈蚀钢绞线力学性能和粘结性能研究[D].长沙:中南大学,2014
[5]戴品强,何则荣,毛志远,等.珠光体裂纹萌生与扩展的TEM原位观察[J].材料热处理学报,2003,24(2):41-45
[6] Toribio J, Ayaso FJ. An isotropic fracture behaviour of cold drawn steel:a materials science approach[J]. Materials Science and Engineering A, 2003,343(1/2):265-272
[7]李富民,袁迎曙.锈蚀钢绞线的静力拉伸断裂特性[J].东南大学学报,2007,37(5):905-909
[8]申丽娟,万长杰,李国军,等.预应力钢绞线SWRH82B断裂分析[J].河南冶金,2012,20(6):23-24
[9]叶忠明.锈蚀钢绞线力学性能试验研究[D].重庆:重庆交通大学,2016
[10]杨绮琴,方北龙,童叶翔.应用电化学[M].第2版.广州:中山大学出版社,2005:112-118