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学者姓名：吴文达
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Abstract ：
This study develops an alkali-activated slag-electric furnace nickel slag (AAS-ENS) composite system by incorporating electric furnace nickel slag (ENS) and granulated blast furnace slag (GBFS) to explore a sustainable and high-value utilization pathway for ENS. The Ca/Si and Si/Al ratios of the precursor materials were adjusted by controlling the GBFS dosage, and their effects on the compressive strength, flexural strength, and microstructure of AAS-ENS composites were systematically investigated. The results indicate that compressive strength exhibits a quadratic relationship with the Ca/Si ratio, with an optimal range of 0.35-0.45. Additionally, the Si/Al ratio shows a negative correlation with compressive strength, with the optimal Si/Al ratio estimated to be below 4. Microstructural analysis, including heat of hydration, X-ray diffraction (XRD), thermogravimetric analysis (TG-DTG), mercury intrusion porosimetry (MIP), and scanning electron microscopy (SEM), revealed that properly balanced Ca/Si and Si/Al ratios promote the formation of C-(A)-S-H gel, leading to higher material density and improved mechanical performance. These findings provide a theoretical foundation for optimizing the mechanical properties and microstructure of AAS-ENS composites and offer practical insights into the sustainable utilization of ENS in eco-friendly construction materials.
Keyword ：
Ca/Si ratio Ca/Si ratio Electric furnace nickel slag Electric furnace nickel slag Mechanical properties Mechanical properties Si/Al ratio Si/Al ratio
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| GB/T 7714 | Wang, Xuefang , Peng, Zixuan , Li, Xianpeng et al. Tailoring mechanical properties of alkali activated slag-electric furnace nickel slag composite system through Ca/Si and Si/ Al ratios [J]. | CASE STUDIES IN CONSTRUCTION MATERIALS , 2025 , 22 . |
| MLA | Wang, Xuefang et al. "Tailoring mechanical properties of alkali activated slag-electric furnace nickel slag composite system through Ca/Si and Si/ Al ratios" . | CASE STUDIES IN CONSTRUCTION MATERIALS 22 (2025) . |
| APA | Wang, Xuefang , Peng, Zixuan , Li, Xianpeng , Sun, Huaqiang , Xu, Liwei , Wu, Wenda . Tailoring mechanical properties of alkali activated slag-electric furnace nickel slag composite system through Ca/Si and Si/ Al ratios . | CASE STUDIES IN CONSTRUCTION MATERIALS , 2025 , 22 . |
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To efficiently and environmentally utilize industrial waste nickel slag and enhance the high-temperature performance of construction materials, this study prepared a binary geopolymer using nickel slag and blast furnace slag as raw materials. By leveraging the advantages of both materials and adjusting the ratio between nickel slag and blast furnace slag, the thermal stability of the geopolymer at high temperatures was improved. This study examined the mechanical properties, mass loss, and thermal deformation behavior of the geopolymer under high-temperature exposure. X-ray diffraction (XRD) and thermogravimetric analysis (TGA) were employed to examine the decomposition and phase transformation of the geopolymer at elevated temperatures. Mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM) were used to characterize the pore structure and microstructure after exposure to various high temperatures. The results revealed that the formation of novel phases, including diopside, forsterite, and spinel, significantly enhances the thermal stability of the geopolymer incorporating nickel slag. Additionally, the C-(A)-S-H gel formed during slag hydration fills the pores, improving the matrix density. This contributes positively to the high-temperature resistance of geopolymers with high slag content. Overall, with a blending ratio of 20 % nickel slag and 80 % blast furnace slag, the geopolymer achieved a compressive strength of 59.7 MPa at 28 days. Under high-temperature conditions of 200, 400, 600, and 800°C, the compressive strength retention of the geopolymer increased by 11.5 %, 24.8 %, 10.8 %, and 5.8 %, respectively, compared to the pure blast furnace slag system. Additionally, mass loss was reduced by 1.01 %, 0.81 %, 0.73 %, and 0.7 %, and thermal shrinkage at 800°C was reduced by 3.07 %. Given its superior high-temperature resistance, the nickel slag-slag based binary geopolymers holds promise as a new type of green building material suitable for high-temperature environments. © 2025
Keyword ：
Bulk Density Bulk Density Compressive strength Compressive strength Hydroelasticity Hydroelasticity Machinability Machinability Slags Slags Tenacity Tenacity Weldability Weldability
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| GB/T 7714 | Wang, Jize , Kang, Sixiang , Zhang, Dongliang et al. Study of thermal resistance and regulation mechanisms in nickel slag-slag based binary geopolymers [J]. | Case Studies in Construction Materials , 2025 , 22 . |
| MLA | Wang, Jize et al. "Study of thermal resistance and regulation mechanisms in nickel slag-slag based binary geopolymers" . | Case Studies in Construction Materials 22 (2025) . |
| APA | Wang, Jize , Kang, Sixiang , Zhang, Dongliang , Wu, Wenda , Zhang, Feng , Wang, Xuefang et al. Study of thermal resistance and regulation mechanisms in nickel slag-slag based binary geopolymers . | Case Studies in Construction Materials , 2025 , 22 . |
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The use of alkali-activated cementitious materials (AACMs) and sea sand to prepare mortar can help reduce the high carbon dioxide emissions associated with ordinary Portland cement and alleviate the shortage of natural aggregates. However, the chloride ions present in sea sand can increase the risk of rebar corrosion. Compared with traditional cements, AACMs may offer superior chloride ion binding capacity. Alkali-activated slag/sea sand (AASS) mortars with varying alkali dosages were prepared in this study. First, the mechanical properties of the AASS mortars were tested. Subsequently, electrochemical methods, including chloride ion fixation and pH analysis, were used to evaluate the corrosion resistance of rebars. The results showed that an increase in alkali dosage enhanced both the pH and the chloride ion fixation capacity, improving the corrosion potential, reducing the corrosion current density and increasing the polarisation resistance. Electrochemical impedance spectroscopy tests indicated optimal corrosion resistance at a 6% alkali dosage, with the best rebar passivation at this level. Analysis of hydration products revealed how the increased alkali dosage boosted chloride ion fixation and rebar corrosion resistance. The results of this work provide a theoretical basis for the application of AASS mortar in construction.
Keyword ：
alkali-activated cements alkali-activated cements alkali-activated slag alkali-activated slag alkali equivalents alkali equivalents corrosion corrosion electrochemistry electrochemistry sea sand mortar sea sand mortar steel bars steel bars
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| GB/T 7714 | Wang, Jize , Kang, Sixiang , Song, Chenhao et al. The impact of alkali equivalent on the corrosion resistance of steel bars in alkali-activated slag/sea sand mortar [J]. | ADVANCES IN CEMENT RESEARCH , 2025 . |
| MLA | Wang, Jize et al. "The impact of alkali equivalent on the corrosion resistance of steel bars in alkali-activated slag/sea sand mortar" . | ADVANCES IN CEMENT RESEARCH (2025) . |
| APA | Wang, Jize , Kang, Sixiang , Song, Chenhao , Wu, Wenda , Lou, Ying , Xu, Liwei et al. The impact of alkali equivalent on the corrosion resistance of steel bars in alkali-activated slag/sea sand mortar . | ADVANCES IN CEMENT RESEARCH , 2025 . |
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The efficient reuse of construction waste plays a vital role in fostering eco-friendly practices in the construction industry. However, the efficient application of recycled powder remains a significant challenge due to its low reactivity. In response to this issue, this study investigates the combination of recycled powder with slag to create a recycled powder-slag-based geopolymers (RPSG) through alkaline activation. To assess the performance of RPSG in erosion-prone environments, the effects of various sulfate types, concentrations, and erosion methods on its sulfate resistance were systematically evaluated. Advanced techniques, including SEM, XRD, FTIR, and MIP, were employed to analyze the microstructural changes. The results show that sulfate-induced expansive products initially improve, but eventually degrade, the performance of RPSG mortar. The stronger reactivity of Mg2 + causes decalcification, making the erosion effect of MgSO4 solution more severe. The wet-dry cycling process accelerates sulfate penetration during the wet phase, leading to faster generation of erosion products, while the crystallization of salts and shrinkage during the drying phase causes more significant degradation. These findings provide valuable theoretical insights for applying RPSG in sulfate-rich environments and serve as a practical reference for improving the durability design of geopolymer-based materials in engineering applications.
Keyword ：
Erosion mechanism Erosion mechanism Geopolymer Geopolymer Microstructure Microstructure Recycled powder Recycled powder Sulfate attack Sulfate attack
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| GB/T 7714 | Lou, Ying , Kang, Sixiang , Wu, Wenda et al. Sulfate resistance of recycled powder-slag-based geopolymers under different erosive environments [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2025 , 462 . |
| MLA | Lou, Ying et al. "Sulfate resistance of recycled powder-slag-based geopolymers under different erosive environments" . | CONSTRUCTION AND BUILDING MATERIALS 462 (2025) . |
| APA | Lou, Ying , Kang, Sixiang , Wu, Wenda , Wang, Xuefang , Sun, Huaqiang , Chen, Feng et al. Sulfate resistance of recycled powder-slag-based geopolymers under different erosive environments . | CONSTRUCTION AND BUILDING MATERIALS , 2025 , 462 . |
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Herein, the effects of the ionic types and content of alkali activator on the chloride-ion permeability of one-part alkali-activated nickel slag concrete were examined. The NT Build 492 method was adopted to measure the Cl- transport performance. In general, the total Cl- concentration in concrete decreases with the increase of penetration depth; however, the enrichment of Clconcentration in the sample is not obvious. Anions have more effect on 28-d compressive strength, while cations have more effect on chlorine-ion permeability. For the same Na2O content, SiO32- -activator and Na+-activator perform better than other anions and cations, while OH- and K+ perform worse than other ions. The chloride-ion permeability coefficient (DRCM) of concrete with Na2SiO3 is the lowest and that with KOH is the highest. The DRCM of concrete prepared with KOH is 1.93 times higher than that of concrete prepared with Na2SiO3. When the activator is Na2SiO3, the DRCM of concrete decreases with the increase in Na2O content when the Na2O content is less than 7%. However, when the Na2O content exceeds 7%, the DRCM of concrete increases with the increase in Na2O content.
Keyword ：
Alkali activator Alkali activator Chloride -ion ion permeability Chloride -ion ion permeability Ionic type Ionic type Na 2 O content Na 2 O content Nickel slag Nickel slag
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| GB/T 7714 | Wang, Xuefang , Lan, Qiaoling , Lin, Huanghua et al. Effects of alkali activator on the chloride-ion permeability of one-part alkali-activated nickel slag concrete [J]. | CASE STUDIES IN CONSTRUCTION MATERIALS , 2024 , 20 . |
| MLA | Wang, Xuefang et al. "Effects of alkali activator on the chloride-ion permeability of one-part alkali-activated nickel slag concrete" . | CASE STUDIES IN CONSTRUCTION MATERIALS 20 (2024) . |
| APA | Wang, Xuefang , Lan, Qiaoling , Lin, Huanghua , Wang, Yasi , Wu, Wenda , Xu, Liwei et al. Effects of alkali activator on the chloride-ion permeability of one-part alkali-activated nickel slag concrete . | CASE STUDIES IN CONSTRUCTION MATERIALS , 2024 , 20 . |
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Buildings in coastal areas have been suffered from seawater immersion and tidal erosion for a long time, and the resistance of building structures to sulfate erosion has always been a concern. In order to solve this problem, this paper attempts to develop a new low-carbon green geopolymer cementitious material that is resistant to sulfate attack. The effect of this geopolymer material on sulfate erosion resistance is investigated in terms of alkali admixture, alkali modulus, water-binder ratio and fly ash admixture. In this paper, the geopolymer materials were tested for sulfate erosion resistance by dry-wet cycle sulfate erosion mechanism. It was shown that the contribution in improving the resistance of geopolymer materials to MgSO4 attack can be ranked as follows: water-binder ratio > fly ash content > alkali content > alkali modulus; Increasing alkali admixture, water-binder ratio and fly ash admixture and decreasing alkali modulus will promote the generation of gypsum in the specimen; Mg2+ in MgSO4 solution makes the volcanic ash reaction products decalcify, and the free Ca2+ and [SO4](2-) combine to generate gypsum, causing gypsum-type erosion damage in the specimen.
Keyword ：
drying-wetting cycles drying-wetting cycles geopolymers geopolymers strength & testing of materials strength & testing of materials sulfate resistance sulfate resistance
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| GB/T 7714 | Lou, Ying , Ma, Shilong , Wang, Yuanda et al. Effect and evaluation of multi-factors on the performance of one-part geopolymer mortar against MgSO4 erosion [J]. | ADVANCES IN CEMENT RESEARCH , 2024 . |
| MLA | Lou, Ying et al. "Effect and evaluation of multi-factors on the performance of one-part geopolymer mortar against MgSO4 erosion" . | ADVANCES IN CEMENT RESEARCH (2024) . |
| APA | Lou, Ying , Ma, Shilong , Wang, Yuanda , Wu, Wenda , Wang, Xuefang . Effect and evaluation of multi-factors on the performance of one-part geopolymer mortar against MgSO4 erosion . | ADVANCES IN CEMENT RESEARCH , 2024 . |
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Abstract ：
碱激发胶凝材料是一种耐酸性较好的新型建筑材料，在酸腐蚀环境中比普通的硅酸盐混凝土耐受性更好。通过综述碱激发胶凝材料的耐酸性能，评估了不同碱激发胶凝材料与普通硅酸盐混凝土在酸性介质中的抗腐蚀性能差异，探究了材料抗酸侵蚀机理，进一步阐明了未来研究的努力方向，可以作为建筑耐酸材料的参考。
Keyword ：
侵蚀机理 侵蚀机理 碱激发胶凝材料 碱激发胶凝材料 耐酸性能 耐酸性能 腐蚀规律 腐蚀规律
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| GB/T 7714 | 胡妙佳 , 黄孟熙 , 黄于毅 et al. 碱激发胶凝材料耐酸性能研究现状综述 [J]. | 福建建材 , 2024 , 4 (02) : 123-126 . |
| MLA | 胡妙佳 et al. "碱激发胶凝材料耐酸性能研究现状综述" . | 福建建材 4 . 02 (2024) : 123-126 . |
| APA | 胡妙佳 , 黄孟熙 , 黄于毅 , 吴文达 . 碱激发胶凝材料耐酸性能研究现状综述 . | 福建建材 , 2024 , 4 (02) , 123-126 . |
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The application of seawater and sea sand concrete (SWSSC) is beneficial for marine engineering, but the impact of aggregate gradation on its alkali-silica reaction (ASR) remains poorly understood. This study aims to bridge this gap by analyzing ASR products, pore characteristics and expansion rate of specimens. The test results reveal that ordinary concrete (OC) exhibits an inhibitory effect on ASR in comparison with to SWSSC. The 14-day expansion of ordinary concrete and SWSSC with the same aggregate gradation are 0.130 % and 0.212 %, showing potential and high risk of ASR, respectively. Moreover, particle size and gradation of aggregate are the key factors influencing the ASR degree of SWSSC. Compared with coarser aggregate, specimens with finer aggregate consume more K+ and Ca2+ ions, generate more ASR-P1, form less porosity, and produce a larger expansion. Additionally, specimens with gap-graded aggregates, as opposed to those with uniform or continuous gradation, show greater consumption of K+ and Ca2+ ions, increased ASR-P1 formation, more harmful pore formation, and a larger expansion. These results offer insights into optimizing aggregate gradation to reduce ASR in SWSSC and improve its durability.
Keyword ：
Aggregate gradation Aggregate gradation Alkali-silica reaction Alkali-silica reaction ASR-P1 ASR-P1 Na-shlykovite Na-shlykovite Seawater and sea sand concrete Seawater and sea sand concrete
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| GB/T 7714 | Wu, Wenda , Kang, Sixiang , Gong, Qingnan et al. Influences of aggregate gradation on alkali-silica reaction of seawater and sea sand concrete [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 427 . |
| MLA | Wu, Wenda et al. "Influences of aggregate gradation on alkali-silica reaction of seawater and sea sand concrete" . | CONSTRUCTION AND BUILDING MATERIALS 427 (2024) . |
| APA | Wu, Wenda , Kang, Sixiang , Gong, Qingnan , Yao, Hongyu , Zhang, Kaijian , Yang, Hongfei et al. Influences of aggregate gradation on alkali-silica reaction of seawater and sea sand concrete . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 427 . |
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Cow dung possesses potential agricultural and energy value but is often regarded as waste and underutilized in most cases. This wastage of resources not only poses a challenge to agricultural sustainability but also limits economic development in rural areas. Cow dung contains natural cellulose components like cellulose and lignin that are derived and used to prepare fiber materials. This paper explores a potential value-added application of agricultural waste, i.e., cow dung fibers to reinforce the alkali-activated slag composites (AASC), which are fabricated based on an industrial by-product slag. The raw and alkali treated cow dung fibers were characterized using scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), thermo-gravimetric analysis (TGA) and X-ray diffraction (XRD). The porosity, density, water absorption, strength and drying shrinkage of AASC were tested and used to evaluate the effect of alkali treated fibers on the properties of AASC. The results showed that subjecting cow dung fibers to alkali treatment improved their surface roughness and thermal stability. The addition of cow dung fibers led to an augmentation in the splitting tensile strength of AASC, primarily due to the bridging action of these fibers. In particular, the 28-day splitting tensile strength of AASC containing 1 wt% of untreated cow dung fibers increased by 17.1% over the reference sample, and this increase was more pronounced in the alkali treated fiber sample. Moreover, the alkali treatment effectively reduced the effects of loss of compressive strength and increased drying shrinkage caused by fiber incorporation. The findings of this paper are helpful to solve the management problems of cow dung waste, reduce the environmental burden and realize the value utilization of resources.
Keyword ：
Alkali-activated slag composites Alkali-activated slag composites Cow dung fibers Cow dung fibers Microstructure Microstructure Strength Strength Treatment Treatment
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| GB/T 7714 | Yang, Zhengxian , Li, Kang , Yan, Xueyuan et al. Characterization and value-added applications of natural cellulose fibers derived from cow dung in cementitious composites [J]. | CELLULOSE , 2024 , 31 (9) : 5575-5589 . |
| MLA | Yang, Zhengxian et al. "Characterization and value-added applications of natural cellulose fibers derived from cow dung in cementitious composites" . | CELLULOSE 31 . 9 (2024) : 5575-5589 . |
| APA | Yang, Zhengxian , Li, Kang , Yan, Xueyuan , Wu, Wenda , Briseghella, Bruno , Marano, Giuseppe Carlo . Characterization and value-added applications of natural cellulose fibers derived from cow dung in cementitious composites . | CELLULOSE , 2024 , 31 (9) , 5575-5589 . |
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The excessive extraction of river sand has led to significant ecological issues. Moreover, the environmental impact and resource demand of cement production have increasingly turned the spotlight on sea sand as a viable alternative due to its abundance and ease of extraction. Concurrently, alkali-activated binders, a novel type of low-carbon cementitious material, have gained attention for their low energy consumption, high durability, and effective chloride ion fixation capabilities. However, they are susceptible to carbonation. Introducing a controlled sea sand amount can raise the materials' carbonation resistance, although carbonation may raise the concentration of free Cl- within the structure to levels that could risk the integrity of steel reinforcements by accelerating corrosion. In this context, the current study investigates sea sand alkali-activated slag (SSAS) concrete prepared with varying water-binder (W/B) ratios to evaluate its impact on flowability, mechanical strength, performances, and chloride ion distribution post-carbonation. The results demonstrate that the mechanical property of SSAS concrete diminishes as the water-to-binder ratio increases, with a more pronounced reduction observed. The depth of carbonation in mortar specimens also rises with the W/B ratio, whereas the compressive strength post-carbonation initially decreases before showing an increase as carbonation progresses. Furthermore, carbonation redistributes chloride ions in SSAS, leading to a peak Cl- concentration near the carbonation front. However, this peak amplitude does not show a clear correlation with changes in the W/B ratio. This study provides a theoretical foundation for employing sea sand and alkali-activated concrete.
Keyword ：
alkali-activated alkali-activated carbonation carbonation chloride ion distribution chloride ion distribution sea sand sea sand water-binder ratio water-binder ratio
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| GB/T 7714 | Wu, Yan , Kang, Sixiang , Zhang, Feng et al. Study on the Effect of Water-Binder Ratio on the Carbonation Resistance of Raw Sea Sand Alkali-Activated Slag Concrete and the Distribution of Chloride Ions after Carbonation [J]. | BUILDINGS , 2024 , 14 (7) . |
| MLA | Wu, Yan et al. "Study on the Effect of Water-Binder Ratio on the Carbonation Resistance of Raw Sea Sand Alkali-Activated Slag Concrete and the Distribution of Chloride Ions after Carbonation" . | BUILDINGS 14 . 7 (2024) . |
| APA | Wu, Yan , Kang, Sixiang , Zhang, Feng , Huang, Haisheng , Liu, Haojie , Zhang, Jianbin et al. Study on the Effect of Water-Binder Ratio on the Carbonation Resistance of Raw Sea Sand Alkali-Activated Slag Concrete and the Distribution of Chloride Ions after Carbonation . | BUILDINGS , 2024 , 14 (7) . |
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