Formation and Failure Law of Rebar Passivation Film in  Liquid Phase Environment of Alkali-Activated Slag

Abstract

Abstract: To explore formation and failure mechanism of rebar passivation film in the liquid-phase environment of alkali-activated slag (AAS) system, AAS cementitious material systems with different mixing designs were prepared. The time-dependent evolution of the pH value of AAS real pore solution was studied in various factors such as different types of activator, alkali equivalent, water-glass modulus, fly ash addition, and curing time. In addition, the generation time, composition, thickness, and critical chloride threshold of rebar passivation film in simulated pore solution were monitored and analyzed over time. The results show that the pH value of AAS real pore solution decreases with the increase of curing time, with pH values of all samples remaining above 12.8 at 28 d. The increase in pH value in the simulated pore solution reduces the formation time of rebar passivation film, increases its thickness, and enhances its resistance to chloride ion erosion. The characteristic of AAS real pore solution having a higher pH value can provide a more favorable liquid phase environment for the stable existence of rebar passivation film, thereby improving the long-term performance of reinforced concrete structures.

Key words: alkali-activated slag, pore solution, pH value, rebar passivation film, rebar corrosion, activator

CLC Number:

TU528.59

WAN Xiaomei, WANG Boshi, SUN Zhongtao, ZHANG Dongfang. Formation and Failure Law of Rebar Passivation Film in Liquid Phase Environment of Alkali-Activated Slag[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(10): 3607-3614.

References

[1] CHEN X Y, WANG S Y, ZHOU Y X, et al. Improved low-carbon magnesium oxysulfate cement pastes containing boric acid and citric acid[J]. Cement and Concrete Composites, 2022, 134: 104813.
[2] PUERTAS F, GIL-MAROTO A, PALACIOS M, et al. Morteros de escoria activada alcalinamente reforzados con fibra de vidrio AR[J]. Materiales De Construcción, 2006, 56(283): 79-90.
[3] POURBAIX M. Thermodynamics and corrosion[J]. Corrosion Science, 1990, 30(10): 963-988.
[4] POURBAIX M. Applications of electrochemistry in corrosion science and in practice[J]. Corrosion, 1974, 14(1): 25-82.
[5] MUNDRA S, CRIADO M, BERNAL S A, et al. Chloride-induced corrosion of steel rebars in simulated pore solutions of alkali-activated concretes[J]. Cement and Concrete Research, 2017, 100: 385-397.
[6] ANGST U, ELSENER B, LARSEN C K, et al. Critical chloride content in reinforced concrete: a review[J]. Cement and Concrete Research, 2009, 39(12): 1122-1138.
[7] 杜玉娇. 碱激发混凝土中的钢筋锈蚀研究[D]. 青岛: 青岛理工大学, 2018.
DU Y J. Corrosion behavour of reinforcement in alkali activated concrete[D]. Qingdao: Qingdao Tehcnology University, 2018 (in Chinese).
[8] WANG Y, CHEN R, HU J, et al. Surface characteristics and electrochemical behaviors of passive reinforcing steel in alkali-activated slag[J]. Corrosion Science, 2021, 190: 109657.
[9] WAN X M, WITTMANN F H, ZHAO T J, et al. Chloride content and pH value in the pore solution of concrete under carbonation[J]. Journal of Zhejiang University Science A, 2013, 14(1): 71-78.
[10] MCPOLIN D O, BASHEER P A, LONG A E. Carbonation and pH in mortars manufactured with supplementary cementitious materials[J]. Journal of Materials in Civil Engineering, 2009, 21(5): 217-225.
[11] WANG W R, CHEN H S, LI X Y, et al. Corrosion behavior of steel bars immersed in simulated pore solutions of alkali-activated slag mortar[J]. Construction and Building Materials, 2017, 143: 289-297.
[12] ISMAIL I, BERNAL S A, PROVIS J L, et al. Influence of fly ash on the water and chloride permeability of alkali-activated slag mortars and concretes[J]. Construction and Building Materials, 2013, 48: 1187-1201.
[13] 施锦杰, 孙伟, 耿国庆. 模拟混凝土孔溶液对钢筋钝化的影响[J]. 建筑材料学报, 2011, 14(4): 452-458.
SHI J J, SUN W, GENG G Q. Influence of simulated concrete pore solution on reinforcing steel passivation[J]. Journal of Building Materials, 2011, 14(4): 452-458 (in Chinese).
[14] GHODS P, BURKAN ISGOR O, BENSEBAA F, et al. Angle-resolved XPS study of carbon steel passivity and chloride-induced depassivation in simulated concrete pore solution[J]. Corrosion Science, 2012, 58: 159-167.
[15] 王培铭, 庞敏, 刘贤萍. 浸水养护下混合水泥浆体孔溶液pH值对钢筋锈蚀的影响[J]. 硅酸盐学报, 2015, 43(2): 152-158.
WANG P M, PANG M, LIU X P. Effect of pH value of pore solution on corrosion-resistance of steel bar in blended cement mortar under water curing condition[J]. Journal of the Chinese Ceramic Society, 2015, 43(2): 152-158 (in Chinese).
[16] SHI J J, MING J, SUN W. Electrochemical performance of reinforcing steel in alkali-activated slag extract in the presence of chlorides[J]. Corrosion Science, 2018, 133: 288-299.
[17] 施锦杰, 孙伟, 耿国庆. 碳化对模拟混凝土孔溶液中HRB335钢腐蚀行为的影响[J]. 金属学报, 2011, 47(1): 17-24.
SHI J J, SUN W, GENG G Q. Influence of carbonation on the corrosion performance of steel HRB335 in simulated concrete pore solution[J]. Acta Metallurgica Sinica, 2011, 47(1): 17-24 (in Chinese).

Formation and Failure Law of Rebar Passivation Film in Liquid Phase Environment of Alkali-Activated Slag

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