Stability Transformation Mechanism of Steel Slag Aggregate with Autoclaved Carbonation

Abstract

In view of the volume instability of steel slag aggregate leading to the quality problem of expansion damage in asphalt road construction, the 4.75–9.5 mm steel slag particles were treated by autoclaved carbonation technology, and the effects of the carbonation system (temperature and time) on the autoclaved pulverization rate, f-CaO content, and the relationship between them for the carbonated steel slag were investigated. In addition, the microstructure of the carbonated steel slag was analyzed by X-ray diffractometer (XRD), scanning electron microscope and energy dispersive spectrometer (SEM-EDS), metallographic microscope and X-ray fluorescence imaging spectrometer (XRF). The experimental results indicate that, under the initial CO₂ pressure of 1.0 MPa, increasing the carbonation temperature leads to the increase in the crystal plane spacing of Ca(OH)₂ that was generated by the hydration of minerals in steel slag, and promotes the transformation of carbonated CaCO₃ from the orthorhombic system to the hexagonal system, resulting in the increase of the crystal planes spacing of them, meantime, accelerates the decomposition of RO phases and also the outward migration of Ca²⁺, Fe²⁺, and Mn²⁺ ions to cover and coat on the Si⁴⁺, Al³⁺ ions, and impels the formation of hydroxides such as Fe(OH)₃ and the formation of carbonates such as Ca(Mg)CO₃, FeCO₃ and MnCO₃. Carbonation at the temperature of 90 °C for 3 h can reach the center of 4.75–9.5 mm steel slag particles. Meanwhile, the increase of temperature can promote the mineral reaction in steel slag, resulting in the fuzzy interface between mineral phases, increase of burrs, dispersion, crossover, reduction of grain size, and rearrangement of mineral particles.

References

[1] WangQ, WangDQ, ZhuangSY. The Soundness of Steel Slag with Different Free CaO and MgO Contents[J]. Constr. Build. Mater., 2017, 151: 138-146

[2] KouWT, ShuCY. Application of High-temperature Rapid Catalytic Technology to Forecast the Volumetric Stability Behavior of Containing Steel Slag Mixtures[J]. Constr. Build. Mater., 2014, 50: 463-470

[3] ZhaoJH, YanPY. Volume Stability and Stabilization Treatment of Steel Slag in China[J]. Bull. Am. Ceram. Soc., 2017, 36(02): 477-484(in Chinese)

[4] ChangJ, WuHZ. Study on Carbonation Mechanism of Steel Slag[J]. J. Chin. Ceram. Soc., 2010, 38(07): 1185-1190(in Chinese)

[5] FangFYCarbonation of Alkaline Minerals in Steel Slag and Products Evolution Process, 2017, Dalian, Dalian University of Technology(in Chinese)

[6] WangDThe Relationship between Growth of Calcium Carbonate and Properties during Carbonation Process of Steel Slag, 2020, Dalian, Dalian University of Technology(in Chinese)

[7] MoLW, ZhangF, DengM. Mechanical Performance and Microstructure of the Calcium Carbonate Binders Produced by Carbonating Steel Slag Paste under CO₂ Curing[J]. Cem. Concr. Res., 2016, 88: 217-216

[8] ZhangF, MoLW, DengM. Effect of Carbonation Curing on Mechanical Strength and Volume Stability of Steel Slag Concrete[J]. J. Chin. Ceram. Soc., 2016, 44(05): 640-646(in Chinese)

[9] LimM, HanGC, AhnJW, et al.. Review Environmental Remediation and Conversion of Carbon Dioxide (CO₂) into Useful Green Products by Accelerated Carbonation[J]. Int. J. Public Health, 2010, 7: 203-228

[10] MahoutianM, ChaallalO, ShaoYX. Pilot Production of Steel Slag Masonry Blocks[J]. Revue Canadienne De Génie Civil, 2018, 9: 1-34

[11] ZhangSP, GhoulehZ, MucciA, et al.. Production of Cleaner High-strength Cementing Material Using Steel Slag under Elevated-temperature Carbonation[J]. J. Clean. Prod., 2022, 342: 130 948

[12] UkwattageNL, RanjithPG, LiX. Steel-making Slag for Mineral Sequestration of Carbon Dioxide by Accelerated Carbonation[J]. Measurement, 2017, 97: 15-22

[13] TuMX, ZhaoHX, LeiZ, et al.. Aqueous Carbonation of Steel Slag: A Kinetics Study[J]. ISIJ. Int., 2015, 55: 2509-2514

[14] BertosMF, SimonsSJR, HillsCD, et al.. A Review of Accelerated Carbonation Technology in the Treatment of Cement-based Materials and Sequestration of CO₂[J]. J. Hazard. Mater., 2004, 112(3): 193-205

[15] NielsenP, BooneMA, HorckmansL, et al.. Accelerated Carbonation of Steel Slag Monoliths at Low CO₂ Pressure-Microstructure and Strength Development[J]. J. CO2 Util., 2019, 36: 124-134

[16] MoLW, ZhangF, DengM, et al.. Accelerated Carbonation and Performance of Concrete Made with Steel Slag as Binding Materials and Aggregates[J]. Cem. Concr. Compos., 2017, 83: 138-145

[17] MaZH, LiaoHQ, WangL, et al.. Effects of Iron/Silicon/Magnesium/Aluminum on CaO Carbonation of CO₂ in Steel Slag-based Building Materials during Carbonation Curing[J]. Constr. Build. Mater., 2021, 298: 123 889

[18] LiJJ, NiW, WangX, et al.. Mechanical Activation of Medium Basicity Steel Slag under Dry Condition for Carbonation Curing[J]. J. Build. Eng., 2022, 50: 104 123

[19] TangWJ, LiaoHQ, ZhouY, et al.. Distribution of Free-calcium Oxide in Converter Slags and Its Stabilization[J]. Steelmaking, 2009, 25(03): 34-36+41(in Chinese)

[20] KoMS, ChenYL, JiangJH. Accelerated Carbonation of Basic Oxygen Furnace Slag and the Effects on its Mechanical Properties[J]. Constr. Build. Mater., 2015, 98: 286-293

[21] Wu HZ, Xu DY. Preparation of Pervious Concrete by Carbonated Steel Slag Aggregate[J]. Cement Eng., 2020, (03): 90–92 (in Chinese)

[22] HeMCResearch on the Preparation and Applications of Accelerated Carbonation Steel Slag Aggregate, 2020, Anhui, Anhui Jianzhu University(in Chinese)

[23] Inspection and Quarantine of the People’s Republic of China, Standardization Administration of the People’s Republic of ChinaTest Method for Stability of Steel Slag, 2009, Beijing, Standards Press of China(in Chinese)

[24] Ministry of IndustryInformation Technology of the People’s Republic of China. YB/T4328-2012 Method for the Determination of Content of Free Calcium Oxide in Steel Slag, 2013, Beijing, Metallurgical Industry Press(in Chinese)

[25] Research Institute of Highway Ministry of Transport. JTG E42-2005Test Methods of Aggregate for Highway Engineering, 2005, Beijing, China Communications Press(in Chinese)

[26] High Branch of China Association for Engineering Construction Standardization. SHC F40-01-2022Technology Guide for Construction of Highway Pavement Using Stone Matrix Asphalt, 2002, Beijing, China Communications Press(in Chinese)

[27] MahoutianM, GhoulehZ, ShaoYX. Carbon Dioxide Activated Ladle Slag Binder[J]. Constr. Build. Mater., 2014, 66: 214-221

[28] LiuP, ZhangM, MoLW, et al.. Probe into Carbonation Mechanism of Steel Slag via FIB-TEM: The Roles of Various Mineral Phases[J]. Cem. Concr. Res., 2022, 162: 106 991

[29] ZhangYZ, LeiYB, LiJG, et al.. Analysis of Mineralogical Composition in Steel Slag and Its Microstructure[J]. Metall. Res. Technol., 2011, 31(09): 11-17(in Chinese)

[30] General Administration of Quality Supervision, InspectionQuarantine of the People’s Republic of China, Standardization Administration. GB/T 25824-2010Steel Slag for Road, 2010, Beijing, Standards Press of China(in Chinese)

[31] Research Institute of Highway Ministry of Transport. JTG F40-2004Technical Specifications for Construction of Highway Asphalt Pavements, 2004, Beijing, Ministry of Transport of the Peoples’ Republic of China(in Chinese)

[32] LiJJ, NiW, WangX, et al.. Mechanical Activation of Medium Basicity Steel Slag under Dry Condition for Carbonation Curing[J]. J. Build. Eng., 2022, 50: 104 123

[33] ZhangY, ChangJ, HeP. Carbonation Reaction of Free CaO and MgO in Steel Slag[J]. J. Dalian Univ. Techno., 2018, 58(06): 634-640(in Chinese)

[34] ChenM, LiR, ZhengXM, et al.. Carbon Sequestration of Steel Slag and Carbonation for Activating RO Phase[J]. Cem. Concr. Res., 2021, 139(1): 106 271

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