To enhance the long-term performance of steel fibers in a marine environment, this research carries out surface treatment of steel fibers based on the iron-catechol biomimetic complexation reaction to improve their rust resistance. The surface treatment of steel fibers was conducted using different immersion times (1 d, 3 d and 7 d), varying concentrations of tannic acid solutions (25 g/L, 50 g/L and 150 g/L), and diverse treatment temperatures (25 ℃ and 55 ℃). The effect and mechanism of rust resistance enhancement were investigated through tensile strength and surface morphology analysis. The results indicate that the biomimetic complexation reaction effectively enhances the chloride ion corrosion resistance of steel fibers by forming a dense protective film on their surface, and improves their long-term tensile strength. Through simulated exposure tests, the long-term performance evolution of surface-treated steel fibers in seawater sea sand mortar was studied. The results reveal that the iron-catechol complexation layer can still effectively protect steel fibers in an alkaline mortar environment, enhance their long-term tensile strength. Meanwhile, tannic acid surface treatment effectively improves the long-term flexural capacity and fracture toughness of steel fiber seawater sea sand mortar specimens. This research provides new design ideas for improving the durability of steel fiber seawater sea sand mortar specimens, which can be applied in marine engineering construction.
ELIMELECHM, PHILLIPW A .The future of seawater desalination:energy,technology,and the environment[J].Science,2011,333(6043):712-717.
[2]
WANGJ, FENGP, HAOT Y,et al .Axial compressive behavior of seawater coral aggregate concrete-filled FRP tubes[J].Construction and Building Materials,2017,147:272-285.
[3]
TANGJ W, CHENGH, ZHANGQ B,et al .Development of properties and microstructure of concrete with coral reef sand under sulphate attack and drying-wetting cycles[J].Construction and Building Materials,2018,165:647-654.
[4]
PHILIPA, SCHWEITZERP E. Paint and coatings:applications and corrosion resistance [M]. Boca Raton:CRC Press,2005
[5]
AL-AMOUDIO S B .Durability of plain and blended cements in marine environments[J].Advances in Cement Research,2002,14(3):89-100.
[6]
EJIMAH, RICHARDSONJ J, LIANGK,et al .One-step assembly of coordination complexes for versatile film and particle engineering[J].Science, 2013, 341(6142): 154-157.
[7]
HEMJ D, HEMJ D. Complexes of ferrous iron with tannic acid[M]. Washington:US Government Printing Office, 1960.
[8]
PHILIPA. SCHWEITZER P E. Fundamentals of corrosion [M]. Oxfordshire:Taylor and Francis,1975.
[9]
HASDEMIRS, TUĞRULA, YıLMAZM .The effect of natural sand composition on concrete strength[J].Construction and Building Materials,2016,112:940-948.
[10]
KATZA, BAUMH .Effect of high levels of fines content on concrete properties[J].ACI Materials Journal,2006,103(6):474-482.
[11]
SAFIUDDINM, RAMANS N, ZAINM F M. Utilization of quarry waste fine aggregate in concrete mixtures [J]. Journal of Applied Sciences Research, 2007, 3(3):202-208.
[12]
TENGJ G, XIANGY, YUT,et al. Development and mechanical behaviour of ultra-high-performance seawater sea-sand concrete[J]. Advances in Structural Engineering, 2019,22(14):3100-3120.
[13]
JINS S, ZHANGJ X, HUANGB S .Fractal analysis of effect of air void on freeze-thaw resistance of concrete[J].Construction and Building Materials, 2013, 47: 126-130.
LIUW, XIEY J, DONGB Q,et al .Study on characteristics of dredged marine sand and the mechanical properties of concrete made with dredged marine sand[J]. Bulletin of the Chinese Ceramic Society,2014,33(1):15-22.(in Chinese)
[16]
RAMASWAMYS D, AZIZM A, MURTHYC K .Sea dredged sand for concrete[M]//Extending aggregate resources.ASTM International 100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,1982:167-177.
[17]
MANIKANDANR, REVATHIS .Behavioural study on treated sea sand as a fine aggregate in concrete[J].Journal of Advances in Civil Engineering,2018,4(2):8-14.
[18]
SUBASHINIB, SIVARANJANIG, DHANALAKSHMIG,et al .Experimental investigation of sea sand for construction purposes[J]. Indian Journal of Science and Technology, 2016, 9(11): 1-5.
[19]
CHAPMANG P, ROEDERA .The effects of sea-shells in concrete aggregates[J]. Concrete,1970,4(2):71-79.
LIUJ, DONGB Q, XINGF,et al .Simulation experiment and mechanism of the combining of sea sand type chlorine ions in cement materials[J].Journal of the Chinese Ceramic Society,2009,37(5):862-866.(in Chinese)
XINGF, LIUJ, DONGB Q,et al .Combination and mechanism of sea sand chloride ion and cement colloid[J].Journal of Southeast University (Natural Science Edition),2006,36(Sup.2):167-172.(in Chinese)
[24]
ANGSTU, ELSENERB, LARSENC K,et al .Critical chloride content in reinforced concrete—a review[J]. Cement and Concrete Research,2009,39(12):1122-1138.
DONGB Q, LIUW, MAH Y,et al .Electrochemical impedance spectroscopy on the hydration behavior of the mortar with marine sand[J].Journal of Building Materials, 2013, 16(2): 306-309.(in Chinese)
MAH Y, XINGF, DONGB Q,et al .Study of electrochemical characteristics for steel corrosion in sea sand concrete[J].Concrete, 2007(7): 20-23.(in Chinese)
LIUJ, XINGF, DONGB Q,et al .Research of chloride diffusion in sea sand concrete[J]. Concrete,2008(3):33-35.(in Chinese)
[31]
LIUW, CUIH Z, DONGZ J,et al .Carbonation of concrete made with dredged marine sand and its effect on chloride binding[J].Construction and Building Materials,2016,120:1-9.
[32]
KATANOK, TAKEDAN, ISHIZEKIY, et al. Properties and application of concrete made with sea water and un-washed sea sand [C]//Proceedings of Third International Conference on Sustainable Construction Materials and Technologies. 2013: 1-10.
[33]
Standard practice for preparation of substitute ocean water:ASTM D1141-98 [S]. ASTM International, 2023.
基金资助
国家重点研发计划资助项目(2023YFB2604400)
National Key R&D Program of China(2023YFB2604400)
国家自然科学基金资助项目(52208246)
National Natural ScienceFoundation of China(52208246)
湖南省自然科学基金资助项目(2023JJ40142)
Natural Science Foundation of Hunan Province(2023JJ40142)
郴州国家可持续发展议程创新示范区建设省级专项项目(2023sfq50)
Provincial Special Project for the Construction of National Sustainable Development Agenda Innovation Demonstration Zone in Chenzhou City(2023sfq50)