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学者姓名：吴文达
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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. © 2024
Keyword ：
Concrete aggregates Concrete aggregates Expansion Expansion Particle size Particle size Seawater corrosion Seawater corrosion Silica Silica
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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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为利用具有潜在活性的固体废弃物电炉镍渣，制备单组分电炉镍渣基地聚物修补砂浆.基于正交实验和极差分析，通过掺入掺合料并改变碱模数和碱当量等关键影响因素，对地聚物砂浆各项修补性能进行调控，获取满足修补性能的最优配合比，确定各因素对修补性能的影响主次.结果表明，最优配比是矿渣掺量为30%,粉煤灰掺量为30%,碱模数为1.2,碱当量为6.5%,其28 d抗压、抗折强度分别为90.29、 9.23 MPa,干燥收缩率为0.56×10~(-3), 14 d拉伸粘结强度为3.64 MPa,满足修补砂浆规范要求.经比较，矿渣掺量对修补砂浆性能调控影响最为显著.
Keyword ：
单组分 单组分 地聚物修补材料 地聚物修补材料 性能调控 性能调控 正交实验 正交实验 电炉镍渣 电炉镍渣 配合比 配合比
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| GB/T 7714 | 吴文达 , 张栋梁 , 王景杨 et al. 单组分电炉镍渣基地聚物修补材料制备与性能调控 [J]. | 福州大学学报(自然科学版) , 2024 , 52 (03) : 322-328 . |
| MLA | 吴文达 et al. "单组分电炉镍渣基地聚物修补材料制备与性能调控" . | 福州大学学报(自然科学版) 52 . 03 (2024) : 322-328 . |
| APA | 吴文达 , 张栋梁 , 王景杨 , 王雪芳 . 单组分电炉镍渣基地聚物修补材料制备与性能调控 . | 福州大学学报(自然科学版) , 2024 , 52 (03) , 322-328 . |
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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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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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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. © 2024 by the authors.
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, Y. , Kang, S. , Zhang, F. 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, Y. 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, Y. , Kang, S. , Zhang, F. , Huang, H. , Liu, H. , Zhang, J. 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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To address the significant carbon emissions caused by the cement industry and its contribution to the greenhouse effect, there is an urgent need for new construction materials that can substantially reduce the use of traditional Portland cement. Alkali-activated binders, known for their excellent performance and lower carbon footprint, have emerged as a promising alternative. Despite the numerous advantages of geopolymers, their practical application is hindered by challenges in processability required for construction techniques, such as pumping, spreading, and forming. This study focuses on enhancing the rheological properties of geopolymers through mechanochemical activation and exploring the modification mechanisms involved. Slag and fly ash raw materials were processed under different ball milling conditions, specifically varying ball milling rotation speed (BR) and ball milling time (BT). The mechanical properties, workability, and rheological behavior of geopolymer specimens were evaluated to identify the optimal milling parameters affecting these properties. Detailed analysis using XRD, SEM, and heat of hydration tests elucidated the phase composition, microstructural evolution, and thermal characteristics of mechanochemically modified geopolymers, providing insights into the fundamental mechanisms of mechanochemical activation modification. The results indicate a significant correlation between ball milling parameters and the rheological properties of geopolymers. The optimal milling regime was identified as grinding at a speed of 70r/min for 50 min. This specific milling condition imparts ideal properties to the geopolymer, including moderate yield stress (34.353 Pa), low plastic viscosity (0.452 Pa s), good thixotropy, and high 28d strength (53.28 MPa), without any significant shear thickening behavior. © 2024
Keyword ：
Ball milling rotation speed Ball milling rotation speed Ball milling time Ball milling time Geopolymer Geopolymer Mechanochemical activation Mechanochemical activation Rheological properties Rheological properties
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| GB/T 7714 | Kang, S. , Wang, J. , Hu, C. et al. The influence of mechanochemical activation on the rheological properties and strength development of geopolymer [J]. | Journal of Building Engineering , 2024 , 96 . |
| MLA | Kang, S. et al. "The influence of mechanochemical activation on the rheological properties and strength development of geopolymer" . | Journal of Building Engineering 96 (2024) . |
| APA | Kang, S. , Wang, J. , Hu, C. , Yao, H. , Sun, H. , Wu, W. et al. The influence of mechanochemical activation on the rheological properties and strength development of geopolymer . | Journal of Building Engineering , 2024 , 96 . |
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Silica fume (SF) is commonly used in producing magnesium potassium phosphate cement (MPC) and magnesium silicate hydrate cement (MSHC). However, its roles in magnesium cement would differ from each other when mono hydrogen phosphate was involved. This paper aims to find optimized compositions in MgO-K2HPO4 DKP- SF system with comprehensive considerations of the micro and macro performances. Ternary contour maps were designed to determine the optimized proportions of MgO, DKP and SF. The hydration reaction mechanism was analyzed with a variety of techniques including XRD, SEM, TG-DTG and NMR. Magnesium cement containing 60–75 % dead-burnt MgO, 10–25 % DKP and 12.5–25 % SF exhibited excellent compressive strength and volume stability. K-struvite and M-S-H were confirmed to promote the hydration and hardening performance of the blended MgO-DKP-SF system with optimized proportions. An excess of soluble K+ from DKP may precipitate as KOH and then dissolute in solution, increasing pH and release of Si from SF. © 2024 Elsevier Ltd
Keyword ：
Hydration Hydration Magnesium potassium phosphate cement Magnesium potassium phosphate cement Magnesium silicate hydrate cement Magnesium silicate hydrate cement MgO-K2HPO4-SiO2 system MgO-K2HPO4-SiO2 system Microstructure Microstructure
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| GB/T 7714 | Sun, H. , Sun, X. , Kang, S. et al. New magnesium cement optimized in MgO-K2HPO4-SiO2 system and its hardening performance [J]. | Construction and Building Materials , 2024 , 446 . |
| MLA | Sun, H. et al. "New magnesium cement optimized in MgO-K2HPO4-SiO2 system and its hardening performance" . | Construction and Building Materials 446 (2024) . |
| APA | Sun, H. , Sun, X. , Kang, S. , Lin, X. , Qian, J. , Wu, W. . New magnesium cement optimized in MgO-K2HPO4-SiO2 system and its hardening performance . | Construction and Building Materials , 2024 , 446 . |
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The growth of construction industry has escalated demands on building material supplies, leading to the accumulation of construction waste. Addressing these issues, our study proposes a novel approach that utilizes alkali activation and slag solid waste to prepare binary geopolymer. This technique notably enhances the utilization of low-activity recycled powders, which are typically underutilized from construction waste. To validate its engineering applicability, we comprehensively examine how recycled powder content influences the properties of recycled powderslag based geopolymers (RPSG), employing the critical factor of alkali equivalent for property regulation. Our research primarily focuses on investigating drying shrinkage behavior RPSG and elucidating the microstructure through XRD, TG, MIP, and SEM analyses. The experimental results indicate that the incorporation of RP, due to its higher water absorption and rougher particles, leads to a decrease in the workability of geopolymers. The presence of inert quartz and calcite in the RP also slows down the hydration reaction rate, resulting in a looser microstructure and increased porosity. This diminishes the mechanical properties of RPSG, and exacerbates drying shrinkage and mass loss. These effects become more pronounced with a mix proportion exceeding 30 %. At a 40 % mix proportion, the flowability of RPSG decreases by 15.5 %, the 28day compressive strength is reduced by 21.0 %, and the drying shrinkage increases by 39.26 %. Although raising the alkali equivalent can improve workability and mechanical properties, it also intensifies drying shrinkage and mass loss. An alkali equivalent of 5 % yields the best overall performance. The study underscores the importance of maintaining RP content below 30 % and selecting a suitable alkali equivalent to optimize RPSG's overall performance.
Keyword ：
Alkali equivalent Alkali equivalent Drying shrinkage Drying shrinkage Geopolymer Geopolymer Recycled powder Recycled powder
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| GB/T 7714 | Lou, Ying , Huang, Mengxi , Kang, Sixiang et al. Study on basic performance and drying shrinkage of binary solid waste geopolymer prepared with recycled powders and slag [J]. | CASE STUDIES IN CONSTRUCTION MATERIALS , 2024 , 20 . |
| MLA | Lou, Ying et al. "Study on basic performance and drying shrinkage of binary solid waste geopolymer prepared with recycled powders and slag" . | CASE STUDIES IN CONSTRUCTION MATERIALS 20 (2024) . |
| APA | Lou, Ying , Huang, Mengxi , Kang, Sixiang , Hu, Miaojia , Wu, Wenda , Chen, Sumin . Study on basic performance and drying shrinkage of binary solid waste geopolymer prepared with recycled powders and slag . | CASE STUDIES IN CONSTRUCTION MATERIALS , 2024 , 20 . |
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