Corrosion Resistance to Chloride and Sulfate Salt Attack of Steel Bar‑Cement Mortar Containing Coal Metakaolin

被引：0

作者：

Li C. ^{[1
]}

Fan Y. ^{[2
]}

Wang Y. ^{[2
]}

Li Q. ^{[2
]}

机构：

[1] Transportation Institute, Inner Mongolia University, Hohhot

[2] College of Transportation Engineering, Dalian Maritime University, Dalian

来源：

Jianzhu Cailiao Xuebao/Journal of Building Materials | 2022年 / 25卷 / 05期

关键词：

Cement mortar; Chloride and sulfate attack; Coal metakaolin; Corrosion; Electrochemistry; Expansion ratio; Steel bar;

D O I：

10.3969/j.issn.1007-9629.2022.05.002

中图分类号：

学科分类号：

摘要：

Effects of coal metakaolin (CMK) on corrosion resistance of cement mortar and its internal steel bar under chloride and sulfate attack were characterized by electrochemistry, flexural strength test, mercury injection and X‑ray diffraction. The results show that CMK cement mortar cover can reduce the corrosion degree and corrosion rate of steel bars, delay the time of pitting damage and improve the corrosion resistance of steel bar. The addition of CMK reduces the expansion ratio and the flexural strength loss of cement mortar during the process of chloride and sulfate attack. CMK can refine the pore structure of cement mortar, inhibit the formation of gypsum, ettringite and other erosion products in cement paste. © 2022, Editorial Department of Journal of Building Materials. All right reserved.

引用

页码：447 / 453

页数：6

共 12 条

[1] JIN Zuquan, Durability and service life prediction of concrete exposed to harsh environment in west of China, (2006)
[2] YU Xuanrui, YAO Guowen, ZHONG Hao, Et al., Corrosion characteristics and mechanical properties of steel strands under coupling effect of alternating load and chloride salt environment, Journal of Building Materials, 24, 6, (2021)
[3] LIU Zanqun, PEI Min, ZHANG Fengyan, Et al., Comparison of chemical attack products in different zones of cement paste partially immersed in Na<sub>2</sub>SO<sub>4</sub> soluton, Journal of Building Materials, 23, 3, (2020)
[4] LIU Y Y, LEI S M, LIN M, Et al., Assessment of pozzolanic activity of calcined coal‑series kaolin, Applied Clay Science, 143, (2017)
[5] WANG L H, LI X Y, YIN C, Et al., Effects of coal‑bearing metakaolin on the compressive strength and permeability of cemented silty soil and mechanisms, Construction and Building Materials, 186, (2018)
[6] LU Chenggong, Durability test and life prediction of reinforced concrete in the harsh environment of western China, (2018)
[7] PECH-CANUL M A, CASTRO P., Corrosion measurement of steel reinforcement in concrete exposed to a tropical marine atmosphere, Cement and Concrete Research, 32, 3, (2002)
[8] PALANISWAMY N, VEDALAKSHMI R., Analysis of the electrochemical phenomenon at the rebar‑concrete interface using the electrochemical impedance spectroscopic technique, Magazine of Concrete Research, 62, 3, (2010)
[9] SAREMI M, MAHALLATI E., A study on chloride‑induced depassivation of mild steel in simulated concrete pore solution, Cement and Concrete Research, 32, 12, (2002)
[10] SOTIRIADIS K, NIKOLOPOULOU E, TSIVILIS S., Sulfate resistance of limestone cement concrete exposed to combined chloride and sulfate environment at low temperature, Cement and Concrete Composites, 34, 8, (2012)

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