Exposure Test Performance for Chromium Bearing Steel in Concrete under Coastal Environment

Toshiyasu Nishimura

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Exposure Test Performance for Chromium Bearing Steel in Concrete under Coastal Environment

机译：沿海环境下混凝土中含铬轴承钢的暴露测试性能

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The corrosion resistance of Cr bearing steel (CR) in concrete was estimated by the exposure test in a coastal environment. Carbon steel (SM) had a significant corrosion on the surface, and the concrete block had large cracks. On the other hand, CR had little corrosion, and there was no crack on the concrete. In the case of Electrochemical Impedance Spectroscopy (EIS) measurements, the impedance at low frequency region (Z_(L)) of CR showed much higher values than that of SM. Cr and Si were enriched in inner rust of CR observed by Energy Dispersive Spectroscopy (EDS) measurement. Transmission Electron Microscopy (TEM) showed that nano complex iron oxides containing Cr and Si were formed in inner rust, which suppressed the corrosion of CR in the concrete.

机译：通过在沿海环境中进行的暴露测试来评估混凝土中含铬轴承钢（CR）的耐腐蚀性。碳钢（SM）在表面上有明显的腐蚀，而混凝土砌块具有较大的裂缝。另一方面，CR几乎没有腐蚀，并且在混凝土上没有裂纹。在电化学阻抗谱（EIS）测量的情况下，CR的低频区域（Z_（L））的阻抗值比SM的阻抗值高得多。通过能量色散光谱法（EDS）观察到，Cr和Si富集在CR的内锈中。透射电子显微镜（TEM）表明，在内部锈中形成了含有Cr和Si的纳米复合氧化铁，从而抑制了CR对混凝土的腐蚀。

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《ISIJ international》 |2018年第5期|共7页
作者
Toshiyasu Nishimura;
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中图分类钢铁冶炼（黑色金属冶炼）（总论）;
关键词
concretecorrosionexposure teststeelrustCrtransmission electron microscopyelectrochemical impedance spectroscopy;

机译：混凝土腐蚀暴露试验铁锈Cr透射电子显微镜电化学阻抗谱;

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专利

1. Exposure Test Performance for Chromium Bearing Steel in Concrete under Coastal Environment [J] . Toshiyasu NISHIMURA ISIJ international . 2018,第5期

机译：沿海环境下混凝土中含铬轴承钢的暴露测试性能
2. Nano Structure of the Rust Formed on Chromium Bearing Steel in Concrete after Wet and Dry Corrosion Test [J] . Toshiyasu NISHIMURA ISIJ international . 2015,第8期

机译：干湿腐蚀试验后含铬钢在混凝土中形成锈的纳米结构
3. Nano Structure of the Rust Formed on Chromium Bearing Steel in Concrete after Wet and Dry Corrosion Test [J] . Toshiyasu Nishimura ISIJ international . 2015,第8期

机译：干湿腐蚀试验后含铬钢在混凝土中形成锈的纳米结构
4. Test of post-fire bearing capacity of ceramsite concrete filled steel columns after exposure to fire [C] . Xintang Wang, Jiaren Zou 2011 Second International Conference on Mechanic Automation and Control Engineering . 2011

机译：陶粒陶钢柱受火后的耐火能力试验
5. Accelerated testing for bond reliability of fiber-reinforced polymers (FRP) to concrete and steel in aggressive environments. [D] . Woods, Jonathan Michael. 2003

机译：在侵蚀性环境下，加快了纤维增强聚合物（FRP）与混凝土和钢之间粘结可靠性的测试。
6. Effect of Steel Fibers on the Hysteretic Performance of Concrete Beams with Steel Reinforcement—Tests and Analysis [O] . Violetta K. Kytinou, Constantin E. Chalioris, Chris G. Karayannis, 2020

机译：钢纤维对钢筋试验及分析混凝土梁滞回的影响及分析
7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。

Exposure Test Performance for Chromium Bearing Steel in Concrete under Coastal Environment

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