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学者姓名：王亚丽
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Abstract ：
The mixing process during concrete manufacturing can solidify CO2, which can facilitate CO2 utilization and reduce the carbon emissions of the cement industry. However, excessive CO2 intervention (>0.3 wt%) during mixing can decrease the ease of use and deteriorate the mechanical properties of concrete, thereby reducing its serviceability. In this study, CO2 was added in the mixing stage at a certain mass ratio relative to cement (0.5-2.0 wt%). To elucidate the strengthening effect of CO2, the factors contributing to the deterioration of the cement properties induced by CO2 and coupling of the carbonation and hydration mechanisms were investigated using mechanical tests, ion concentration analysis, scanning electron microscopy, X-ray diffraction analysis, mercury intrusion porosimetry, and other testing methods. CO2 stimulated the rapid hydration of clinker minerals to form a C-S-H gel, which rapidly set the slurry and deteriorated its fluidity and mechanical properties. Such rapid setting was no longer observed after coupling the carbonation and hydration mechanisms. CO2 caused calcovanadite to form hexagonal prisms with high degrees of crystallization and optimized the combination of calcovanadite with other hydration products. CO2 also refined the pore structure of the slurry to enhance the compressive strengths after 3, 7, and 28 d by 36.5 %, 24.8 %, and 20.0 %, respectively, with a CO2 dosage of 1.6 wt%, which considers the degree of carbon sequestration and performance. Thus, this study provides a theoretical guide for CO2 application in cement-based materials.
Keyword ：
Mechanical performance Mechanical performance C-S-H gel C-S-H gel Hydration Hydration Carbonation Carbonation
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| GB/T 7714 | Wang, Yali , Meng, Wanyou , Wang, Hui et al. Mechanism and effect of carbonation on the hydration of silicate cement during mixing [J]. | JOURNAL OF BUILDING ENGINEERING , 2025 , 101 . |
| MLA | Wang, Yali et al. "Mechanism and effect of carbonation on the hydration of silicate cement during mixing" . | JOURNAL OF BUILDING ENGINEERING 101 (2025) . |
| APA | Wang, Yali , Meng, Wanyou , Wang, Hui , Cui, Suping , Pei, Tianrui . Mechanism and effect of carbonation on the hydration of silicate cement during mixing . | JOURNAL OF BUILDING ENGINEERING , 2025 , 101 . |
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Abstract ：
This study presents a strategy for decreasing cement-production-induced CO2 emissions and achieving comprehensive utilization of copper tailings (CTs). This is realized by preparing Portland cement clinkers dominated by calcium silicate minerals with a low Ca/Si ratio through the adjustment of the siliceous (CTs) to calcareous (limestone) material ratio. Differential scanning calorimeter (DSC), quantify X-ray diffraction (QXRD), scanning electron microscopy (SEM), 29 Si nuclear magnetic resonance (NMR), and thermogravimetric (TG) analyses were employed to systematically characterize the thermodynamic behavior and mineral composition changes during the formation of the low-calcium Portland cement clinker, and to analyze their mechanical properties, carbonation products, and microstructural evolution under accelerated carbonation conditions (high pressures and CO2 concentration). CTs used as siliceous raw materials enabled the preparation of the low-calcium Portland cement clinkers with wollastonite (CS), belite (C2S), and rankinite (C3S2) as the main mineral phases at 1200 degrees C. The Ca/Si ratio and calcination temperature markedly influenced the clinker minerals. For a Ca/Si ratio of <= 1.0, CS was the main clinker mineral. When the Ca/Si ratio was between 1.0 and 1.4, the clinker comprised the C2S-C3S2 system, with the C3S2 content increasing as the calcination temperature increased. The prepared clinker achieved a compressive strength of over 100 MPa after carbonation when calcined at 1200 degrees C with a Ca/Si ratio of 1.4. Carbonation of several low-calcium-content silicate minerals produced CaCO3, mainly as spherical vaterite crystals, while silica in the system formed silica gel, which formed a reticulated structure with CaCO3.
Keyword ：
Thermodynamic behavior Thermodynamic behavior Copper tailings Copper tailings Accelerated carbonization Accelerated carbonization Low-calcium Portland cement clinker Low-calcium Portland cement clinker Calcium carbonate Calcium carbonate
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| GB/T 7714 | Pei, Tianrui , Zheng, Yan , Wang, Yali et al. Utilization of copper tailings in the preparation of low-calcium Portland cement clinker and carbonation-hardening mechanism [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 457 . |
| MLA | Pei, Tianrui et al. "Utilization of copper tailings in the preparation of low-calcium Portland cement clinker and carbonation-hardening mechanism" . | CONSTRUCTION AND BUILDING MATERIALS 457 (2024) . |
| APA | Pei, Tianrui , Zheng, Yan , Wang, Yali , Zhang, Dajiang , Zhang, Peng , Cui, Suping et al. Utilization of copper tailings in the preparation of low-calcium Portland cement clinker and carbonation-hardening mechanism . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 457 . |
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Abstract ：
Global warming caused by carbon dioxide (CO2) emissions has emerged as an undeniable environmental concern. While advocating for energy conservation and emissions reduction, the challenge of addressing the substantial CO2 emissions cannot be underestimated. Currently, steel slag is utilized in carbon capture and storage technology due to its potential for carbonation. However, the carbonation of steel slag necessitates a stable and cost-effective carbon source. Industrial exhaust gases are considered a viable option, but they often have low CO2 concentrations, resulting in sluggish carbonation rates. Therefore, this study focuses on directly converting steel slag powder into concrete mineral admixtures to enhance the carbonation rate at low CO2 concentrations. Experimental results reveal that a carbonation time of 3-7 days, a liquid-solid ratio of 50%, and the selection of sodium silicate as the alkali activator yield the optimal carbonation conditions. Under these conditions, the CO2 uptake can reach 15.3%-16.0%, and the f-CaO content can be reduced to 0.2%-0.3%. Mixing 30% carbonated steel slag powder with P center dot I 42.5 cement in mortar samples yields a compressive strength of 32.1 MPa at 7 days and 47.5 MPa at 28 days, along with a flexural strength of 6.2 MPa at 7 days and 8.0 MPa at 28 days. The addition of carbonated steel slag powder not only enhances the mechanical properties but also reduces the pore diameter in the hardened cementitious system. In 7 days, the pore size decreases from being concentrated around 349 nm to approximately 282 nm, and in 28 days, the pore size decreases from being concentrated around 62 nm to roughly 55 nm. This transformation is primarily attributed to the role played by calcite grains in the carbonated steel slag powder, which facilitates nucleation and filling effects.
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| GB/T 7714 | Sun, Lie , Wang, Hui , Wang, Yali . Properties of Carbonated Steel Slag Admixture in the Cementitious System [J]. | ADVANCES IN CIVIL ENGINEERING , 2023 , 2023 . |
| MLA | Sun, Lie et al. "Properties of Carbonated Steel Slag Admixture in the Cementitious System" . | ADVANCES IN CIVIL ENGINEERING 2023 (2023) . |
| APA | Sun, Lie , Wang, Hui , Wang, Yali . Properties of Carbonated Steel Slag Admixture in the Cementitious System . | ADVANCES IN CIVIL ENGINEERING , 2023 , 2023 . |
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Abstract ：
As a kind of air pollutant, nitrogen oxide cause serious human, environmental and ozon layer issues. Non -ammonia catalytic materials have a more simple and environments-friendly reaction process without second-ary pollution, and therein are considered as an ideal catalyst for the reduction of NO in the flue gas of cement kilns. In this paper, the denitrification performance of coal gasification slag was investigated systematically at different temperatures and oxygen concentrations in cement kiln flue gas. The transformation mechanism of NO was studied by analyzing the changes of surface element valence state, the adsorption and desorption of NO and the formation of intermediate during the reaction process. The results show that the conversion rate of NO in flue gas can reach 83.49 % when the temperature is 1000 degrees C and the oxygen concentration is 1 %. The charged ionic groups are generated by the isomorphous substitution of Fe3+ in coal gasification slag, and play an important role in the decomposition of NO as active components. It can increase the number of surface oxygen vacancies, and accelerate the fracture of N-O bonds into active components; Meanwhile, Fe3+ could coordinate with O- and NO- (generated by N-O fracture) to form Fe3+-O- and Fe3+-NO-, which can be decomposed into Fe2+, N2 and O2 at high temperature.
Keyword ：
Isomorphous substitution Isomorphous substitution Oxygen vacancy Oxygen vacancy Coal gasification slag Coal gasification slag NO decomposition NO decomposition
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| GB/T 7714 | Wang, Yali , Han, Xiaoning , Cui, Suping et al. Study on the mechanism of iron-rich coal gasification slag on NO conversion in high temperature flue gas of cement kiln [J]. | FUEL , 2023 , 332 . |
| MLA | Wang, Yali et al. "Study on the mechanism of iron-rich coal gasification slag on NO conversion in high temperature flue gas of cement kiln" . | FUEL 332 (2023) . |
| APA | Wang, Yali , Han, Xiaoning , Cui, Suping , Hu, Xibo , Ma, Xiaoyu , Hao, Liwei . Study on the mechanism of iron-rich coal gasification slag on NO conversion in high temperature flue gas of cement kiln . | FUEL , 2023 , 332 . |
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Abstract ：
In order to improve the properties of lime-based mortars and promote the green development of the construction industry, blended lime-based mortars were prepared by using carbide slag instead of hydrated lime, and the additions of Portland cement and sulphoaluminate cement were studied in our work. The paper focused on mechanical properties, porosity, capillary water absorption and drying shrinkage of both types of blended mortars. The chemical composition and microstructure of hydration products were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that sulphoaluminate cement provided more contributions to mechanical properties, capillary water absorption and early shrinkage compared to Portland cement.
Keyword ：
capillary water absorption capillary water absorption mechanical properties mechanical properties carbide slag carbide slag porosity porosity mortar mortar cement cement drying shrinkage drying shrinkage
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| GB/T 7714 | Nie, Song , Wang, Jianfeng , Lan, Mingzhang et al. Effect of Portland Cement versus Sulphoaluminate Cement on the Properties of Blended Lime-Based Mortars Prepared by Carbide Slag [J]. | MATERIALS , 2019 , 12 (7) . |
| MLA | Nie, Song et al. "Effect of Portland Cement versus Sulphoaluminate Cement on the Properties of Blended Lime-Based Mortars Prepared by Carbide Slag" . | MATERIALS 12 . 7 (2019) . |
| APA | Nie, Song , Wang, Jianfeng , Lan, Mingzhang , Wang, Yali , Zhang, Qiaowei . Effect of Portland Cement versus Sulphoaluminate Cement on the Properties of Blended Lime-Based Mortars Prepared by Carbide Slag . | MATERIALS , 2019 , 12 (7) . |
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Abstract ：
Many complex factors can affect the process of SNCR in cement calciner, and the cement raw meal rate value is a relatively important one. In the present study the influence of the cement raw meal rate value on the SNCR denitration efficiency was investigated in a tubular reactor with a space velocity of 27000 ml/h in the temperature range of 700-1100 °C, and the oxygen concentration was 5% and both the inlet concentration of NO and NH3 was designed as 1000ppm. The results showed that the denitrification rate of SNCR decreased with the increase of the lime saturation factor (KH) of cement raw meal and increased with the increase of aluminum rate (IM) of cement raw meal at 700~900 recommended that the cement raw meal with low KH, medium silica acid rate (SM) and high IM should be used. In the temperature range of 900~1100 the denitrification efficiency of SNCR increased with the KH and decreased with the increase of IM. Based on the experimenyal results it is suggested that the cement raw meal with high KH, high SM and low IM should be adopted. © 2019 Trans Tech Publications, Switzerland.
Keyword ：
Cements Cements Denitrification Denitrification Calcination Calcination Efficiency Efficiency Silica Silica Ammonia Ammonia Lime Lime Nitrogen removal Nitrogen removal
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| GB/T 7714 | Wang, Ya-Li , Li, Nan , Zhang, Hong-Zhan et al. Effect of the cement raw meal rate value on SNCR deNOx efficiency with NH3 as reducing agent [C] . 2018 : 1215-1220 . |
| MLA | Wang, Ya-Li et al. "Effect of the cement raw meal rate value on SNCR deNOx efficiency with NH3 as reducing agent" . (2018) : 1215-1220 . |
| APA | Wang, Ya-Li , Li, Nan , Zhang, Hong-Zhan , Cui, Su-Ping , Zhang, Yun-Ning . Effect of the cement raw meal rate value on SNCR deNOx efficiency with NH3 as reducing agent . (2018) : 1215-1220 . |
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Abstract ：
As the selective non-catalytic reduction denitration(SNCR denitration) was used in cement decomposition furnaces under the high concentration cement raw materials and complex flue gas composition, the denitration efficiency is poor and the reducing agent is largely consumed.In order to meet the more stricter requirements of environmental protection, there is an urgent need to improve the denitration efficiency of SNCR and reduce the escape of reducing agentsin order to prevent the unnecessary waste caused by excessive use of reducing agents and secondary atmospheric pollution.Therefore, studying the effect of cement raw materials and O2 concentration on SNCR process is very important. In this paper, the initial concentration of NO and the ammonium to nitrogen ration (CNH3/CNO) was 800ppm and 1.5, respectively. The effects of cement raw material and oxygen concentration on the reaction process of NH3 +NO+O2 in the temperature range of 750-1100 were investigated by means of denitration rate, in Situ DRIFTS analysis.The results demonstrate when O2 concentration was 5% and denitration temperature was 950, the deNOx rate reached a maximum of 89.64%, which due to O2 promoted NH3 and NO to react with O2 to produce N2 and H2 O. However,under the effect of cement raw material, O2 can promote NH3 which was adsorbed on the surface of cement raw material to react with O2 and produce NO and H2 O, and the reaction of oxidation of NH3 is dominant, therefore, the denitration reaction is inhibited..When O2 concentration was 5% and temperature was 850, the deNOx rate reached a minimum value of -109.09%. the high concentration cement raw material and flue gas composition reduce the denitration efficiency of cement kiln. © 2018 Trans Tech Publications, Switzerland.
Keyword ：
Reducing agents Reducing agents Nitrogen removal Nitrogen removal Efficiency Efficiency Cements Cements Selective catalytic reduction Selective catalytic reduction Reduction Reduction Oxygen Oxygen Flue gases Flue gases Ammonia Ammonia
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| GB/T 7714 | Wang, Ya Li , Li, Nan , Peng, Si Yu et al. Effect of cement raw material and oxygen concentration on SNCR reaction [C] . 2018 : 969-975 . |
| MLA | Wang, Ya Li et al. "Effect of cement raw material and oxygen concentration on SNCR reaction" . (2018) : 969-975 . |
| APA | Wang, Ya Li , Li, Nan , Peng, Si Yu , Zhang, Yun Ning , Chen, Mei Na , Cui, Su Ping . Effect of cement raw material and oxygen concentration on SNCR reaction . (2018) : 969-975 . |
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Abstract ：
Selective non-catalytic reduction (SNCR) is a denitration method in the high temperature area, and NH3 or urea is used for SNCR as reducing agents to react with NOX to produce N2 in the flue gas in the temperature ranged from 850°C to 1100°C. The SNCR deNOx technology has been well used in utility boiler, but compared with it, the lower denitration efficiency and the larger consumption of ammonia indicate a more complex process in cement pre-calciner. Unlike in utility boiler, the presence of high concentrations of cement raw materials may influence SNCR denitration reaction process in cement kilns. Therefore, studying the effect of CaO which occupy the major composition of cement raw material is very important in SNCR process. In this study the influence of CaO on the SNCR deNOx process was investigated by simulating SNCR reaction at temperature that ranges from 750°C to 1100°C with different normalized stoichiometric ratio. The experimental results demonstrate that the addition of CaO increases the optimum denitration temperature to 1100°C, but it has no effect on normalized stoichiometric ratio. In the whole reaction process NH3 not only restores NO to O2 but also reacts with O2 to NO. Since the adsorption of NH3 on CaO surface, in the temperature range of 750°C -850°C the addition of CaO promotes the reaction of NH3 and O2 and increases NOX concentration. However, in the temperature range of 850°C -1000°C it not only promotes NH3 oxidation but also inhibits the reduction reaction of NH3, thereby the denitration reaction is inhibited. In the temperature range of 1050°C -1100°C the denitration reaction is promoted due to the NH3 desorption from CaO surface. © 2016 Trans Tech Publications, Switzerland.
Keyword ：
Adsorption; CaO; Normalized stoichiometric ratio; SNCR Adsorption; CaO; Normalized stoichiometric ratio; SNCR
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| GB/T 7714 | Zhang, Y.N. , Wang, Y.L. , Cui, S.P. et al. Effect of CaO on SNCR reaction with NH3 as reducing agent [C] . 2016 : 249-255 . |
| MLA | Zhang, Y.N. et al. "Effect of CaO on SNCR reaction with NH3 as reducing agent" . (2016) : 249-255 . |
| APA | Zhang, Y.N. , Wang, Y.L. , Cui, S.P. , Wang, W. , Zhao, Y.N. . Effect of CaO on SNCR reaction with NH3 as reducing agent . (2016) : 249-255 . |
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Abstract ：
The development of the city traffic and its increasing traffic flux are the signs of the development of the society, but causing a serious pollution on the city's ecological environment. Cement hydration reactions are needed to generate Ca(OH)2, C-S-H gel, and AFt, as well as other hydrated products. Meanwhile, heavy metal ions are contained and fixed in a cement paste under physical encapsulation, absorption, isomorphous replacement, and double decomposition. This paper mainly discusses the impact of hydration environment on the adsorption law of materials adsorbing heavy metal ions and the adsorption mechanism under different pH values and temperatures, analyzing specific reasons from the perspective of micro-structure. Through the analysis it can be seen that, in addition to zinc ions, the cement-based materials’ capacity of adsorbing heavy metal ions increases as the pH value and the temperature increase. Micro-structure analysis shows that cement-based materials’ main adsorption methods are different when pH values are different. © 2016 Trans Tech Publications, Switzerland.
Keyword ：
Adsorption law; Cement-based materials; Heavy metal ions; Hydration environment; Ph value and temperature Adsorption law; Cement-based materials; Heavy metal ions; Hydration environment; Ph value and temperature
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| GB/T 7714 | Wang, Y.L. , Cui, S.P. , Xu, X.K. et al. Impact of pH value and temperature on cement-based materials adsorbing heavy metal ions [C] . 2016 : 265-271 . |
| MLA | Wang, Y.L. et al. "Impact of pH value and temperature on cement-based materials adsorbing heavy metal ions" . (2016) : 265-271 . |
| APA | Wang, Y.L. , Cui, S.P. , Xu, X.K. , Lan, M.Z. . Impact of pH value and temperature on cement-based materials adsorbing heavy metal ions . (2016) : 265-271 . |
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Abstract ：
When steel slag, a by-product of steel making in impurity catching process, is added, the forming process of cement clinker and the major reactions in that process are changed. Since there are dramatic differences between the chemical components and mineral compositions of steel slag and that of natural cement raw materials, the empirical equation for the calculating forming heats of cement clinker made of limestone and clay is no longer applied for those made of steel slag. In this paper, the empirical equation for forming heat calculation of steel slag added cement clinker was promoted, and testified by acid dissolution experiments. Results showed that the change of raw materials had great influence on the forming heat of cement clinker. When the traditional raw materials were replaced with steel slag, the forming heat of cement clinker reduced. Calculating the forming heat by our revised empirical equation can help reduce errors and bring great convenience for the calculation and evaluation of heat efficiency. This research provides theoretical underpinning for the study and calculation of forming heat of steel slag added cement clinker. © (2015) Trans Tech Publications, Switzerland.
Keyword ：
Acid dissolution method; Empirical equation; Forming heat of cement clinker; Steel slag Acid dissolution method; Empirical equation; Forming heat of cement clinker; Steel slag
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| GB/T 7714 | Wang, Y.L. , Cui, S.P. , Tian, G.P. et al. Theoretical calculation and experimental study on the forming heat of cement clinker made from steel slag [C] . 2015 : 564-568 . |
| MLA | Wang, Y.L. et al. "Theoretical calculation and experimental study on the forming heat of cement clinker made from steel slag" . (2015) : 564-568 . |
| APA | Wang, Y.L. , Cui, S.P. , Tian, G.P. , Lan, M.Z. , Wang, Z.H. . Theoretical calculation and experimental study on the forming heat of cement clinker made from steel slag . (2015) : 564-568 . |
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