检索结果-南通市图书馆

Journal of Materials Science & Technology 2021年第5期64卷 126-140页

作者： Ini-Ibehe Nabuk Etim Junhua Dong Jie Wei Chen Nan Durga Bhakt Pokharel Aniefiok Joseph Umoh Dake Xu Mingzhong Su Wei Ke Environmental Corrosion Centre Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences 19A Yuquan Road Shijingshan DistrictBeijing 100049China Department of Marine Biology Akwa Ibom State UniversityP.M.B.1167UyoNigeria School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Sani-care Salon Products Inc.USA

The corrosion damage of 20 SiMn steel by sulphate-reducing bacteria(SRB)and the mitigation effect of organic silicon quaternary ammonium salt(OSA)were studied in sterilized mild alkaline simulated concrete pore solution(STR)with different additions of SRB and OSA at pH 9.35 for 28 *** corrosion occurs in STR medium while slight localized corrosion is observed in STR+OSA medium,and localized pitting corrosion occurs in STR+SRB and STR+SRB+OSA *** largest pit depth reduces from 36.70μm in STR+SRB medium to 3.31μm in STR+SRB+OSA medium due to the mitigation effect of *** corrosion rate reflected by weight loss and electrochemical impedance spectroscopy(EIS)results presents the order of STR

关键词： steel reinforced concrete Microbial corrosion Biocide EIS

Influence of mill scale and rust layer on the corrosion resistance of low-alloy steel in simulated concrete pore solution

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2017年第1期24卷 64-74页

作者： Jin-jie Shi Jing Ming Jiangsu Key Laboratory of Construction Materials School of Materials Science and EngineeringSoutheast UniversityNanjing 211189China

Electrochemical impedance spectroscopy, cyclic potentiodynamic polarization measurements, and scanning electron microscopy in conjunction with energy-dispersive X-ray spectroscopy were used to investigate the influence of mill scale and rust layer on the passivation capability and chloride-induced corrosion behaviors of conventional low-carbon（LC） steel and low-alloy（LA） steel in simulated concrete pore solution. The results show that mill scale exerts different influences on the corrosion resistance of both steels at various electrochemical stages. We propose that the high long-term corrosion resistance of LA steel is mainly achieved through the synergistic effect of a gradually formed compact, adherent and well-distributed Cr-enriched inner rust layer and the physical barrier protection effect of mill scale.

关键词： steel reinforced concrete low alloy steel low carbon steel steel corrosion corrosion resistance

Experimental and analytical study on seismic behavior of steel-concrete multienergy dissipation composite shear walls

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2015年第1期14卷 125-139页

作者： Dong Hongying Cao Wanlin Wu Haipeng Qiao Qiyun Yu Chuanpeng College of Architecture and Civil Engineering Beijing University of Technology

In this paper, a steel-concrete multi-energy dissipation composite shear wall, comprised of steel-reinforced concrete （SRC） columns, steel plate （SP） deep beams, a concrete wall and energy dissipation strips, is proposed. In order to study the multi-energy dissipation behavior and restorability after an earthquake, two stages of low cyclic loading tests were carded out on ten test specimens. In the first stage, test on five specimens with different number of SP deep beams was carried out, and the test lasted until the displacement drift reached 2%. In the second stage, thin SPs were welded to both sides of the five specimens tested in the first stage, and the same test was carried out on the repaired specimens （designated as new specimens）. The load-bearing capacity, stiffness, ductility, hysteretic behavior and failure characteristics were analyzed for both stages and the results are discussed herein. Extrapolating from these results, strength calculation models and formulas are proposed herein and simulations using ABAQUS carried out, they show good agreement with the test results. The study demonstrates that SRC columns, SP deep beams, concrete wall and energy dissipation strips cooperate well and play an important role in energy dissipation. In addition, this study shows that the shear wall has good recoverability after an earthquake, and that the welding of thin SP＇s to repair a deformed wall is a practicable technique.

关键词： steel reinforced concrete steel plate deep beam multi energy dissipation composite shear wall seismic behavior

Effect of seismic design details on hysteresis performance of SRC-RC transfer columns

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2020年第1期19卷 117-135页

作者： Wu Kai Zhai Jiangpeng Xue Jianyang Zhao Hongtie Chen Feng College of Civil and Transportation Engineering Hohai UniversityNanjing 210024China Department of Civil and Environmental Engineering National University of SingaporeSingapore 117576Singapore School of Civil Engineering Xi’an University of Architecture&TechnologyXi’an 710055China

Four types of seismic design details were tested using 11 transfer column specimens and one comparison specimen of RC under low cyclic reversed loading. Test results show that diagonal cracks control the failure pattern and damage occurs mainly in the RC section with weak shear capacity in the transfer columns. There is a large difference in the bearing capacity and ductility of the transfer columns according to the test results, which indicates that the strengthening effect of diverse structural measures is quite different. The section ratio of I-section-encased steel and the axial compression ratio also have a great influence on the bearing capacity and ductility. Although the bearing capacity of transfer columns with additional longitudinal bars and additional X bars is relatively large, they have poor deformation capacity. Setting more stirrups along the columns is the best structural measure to enhance the seismic performance. The studs on the I-sectionencased steel by welding can help to complete the stress transfer between the steel and concrete, and avoid performance degradation of the two materials due to bonding failure.

关键词： seismic design details hysteresis performance steel reinforced concrete transfer column energy dissipation

A Time-saving Method for Assessing the Corrosion Inhibitor Efficiency

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2010年第5期25卷 856-861页

作者：耿春雷翁端 Key Laboratory of Advanced Materials Department of Materials Science and Engineering Tsinghua University

Corrosion inhibitor is one of the most important technologies to enhance the durability of steel reinforced concrete. A kind of time-saving method was developed to assess the inhibitor efficiency by using a 16 voltage electric field to accelerate the chloride ion diffusion in concrete and inducing corrosion. Both macrocell and microcell current measurements were used to confirm the corrosion initiation status of steel. The comprehensive efficiency of inhibitor shall be assessed in three aspects. The results clearly show the efficiency of different inhibitors, which indicate the reliability of this time-saving method.

关键词： inhibitors efficiency chloride ions diffusion steel reinforced concrete

A State-of-the-Art Review of Electrochemical Chloride Extraction for concrete Structures

在线全文

学校读者我要写书评

暂无评论

Open Journal of Civil Engineering 2023年第1期13卷 1-24页

作者： Thamara Tofeti Lima iBMB (Institute of Building Materials Concrete Constructions and Fire Safety) Division of Concrete Construction TU Braunschweig Braunschweig Germany

Electrochemical chloride extraction is a promising technique for the rehabilitation of concrete structures under chloride induced corrosion. This study consists of an extensive literature review of this treatment including application cases. It is found that the rate of chlorides removed is affected by the total charge passed, whereas increasing charge in a range between 1500 to 2000 Ah/m2 increases the amount of chlorides removed and this can be more effective by increasing current density instead of duration of treatment. Bound chlorides are extracted during treatment and, water works better than Ca(OH)2 as an electrolyte, possibly due to modifications on the concrete pore structure. Moreover, ECE is not efficient in repassivate structures but is efficient in its purpose of removing chlorides if treatment setup is well planned, which justifies the need for better international standards on the topic.

关键词： Chloride Induced Corrosion Corrosion Rehabilitation Electrochemical Chloride Extraction Electrochemical Rehabilitation Methods steel reinforced concrete