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学者姓名：张勇
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Abstract ：
The introduction of high-volume steel slag into ordinary Portland cement (OPC) has a negative effect on the pore structure due to its poor hydraulic reactivity. Synergistic effects between steel slag and ground granulated blast furnace slag (GGBFS) in cementitious system have drawn increasing attention. In this study, the modified Andreasen and Andersen (MAA) model was adopted for the mixture design of ternary cementitious system incorporating high-volume ultrafine steel slag (USS) and GGBFS without a compromise in strength. X-ray computed tomography (X-CT) and mercury intrusion porosimetry (MIP) were applied to characterize the pore structure of various cementitious mortars in terms of porosity, pore size, pore number, pore morphology and homogeneity. Results manifested that the adverse impact of USS addition on the pore structure of binary cement was effectively mitigated in the ternary cement USS-GGBFS-OPC after mixture optimization, whereby the pore size was shifted toward a finer distribution and simultaneously with a higher uniformity and consequently promoting the compressive strength development. An increase of cumulative pore volume as captured by X-CT was associated with an exponential decrease of the number of pores while together with larger pore sizes. The increase in the number of small pores led to an increase in the pore tortuosity and degree of sphericity. The fractal dimension of pores was negatively correlated with pore inhomogeneity and compressive strength. These findings provide new insights into homogeneity-oriented mixture design of composite cementitious binders based on gap-graded particle packing, together with their synergistic effects on hydration progress.
Keyword ：
Fractal dimension Fractal dimension Homogeneity Homogeneity Particle packing optimization Particle packing optimization Pore structure Pore structure Ultrafine steel slag Ultrafine steel slag X-ray computed tomography X-ray computed tomography
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| GB/T 7714 | Yang, Zhengxian , Dong, Shilin , Zhang, Yong . Particle packing optimization and pore structure assessment of ternary cementitious system based on X-ray computed tomography and mercury intrusion porosimetry [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 413 . |
| MLA | Yang, Zhengxian 等. "Particle packing optimization and pore structure assessment of ternary cementitious system based on X-ray computed tomography and mercury intrusion porosimetry" . | CONSTRUCTION AND BUILDING MATERIALS 413 (2024) . |
| APA | Yang, Zhengxian , Dong, Shilin , Zhang, Yong . Particle packing optimization and pore structure assessment of ternary cementitious system based on X-ray computed tomography and mercury intrusion porosimetry . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 413 . |
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Recycled coarse-aggregate (RCA) derived from waste concrete can be re-used for concrete preparation, which is now limited due to its drawbacks such as micro-cracks, high-porosity, and reduced concrete strengths. To remedy these deficiencies, carbon-sequestration was employed to enhance RCA and the conditions were optimized, including the temperature (20 °C–40 °C), pressure (0.1 MPa–0.3 MPa), time (5 h–24 h) and initial water content (25%–75 %). There parameters were optimized based on the orthogonal test with scheme L9(34), which was evaluated based on RCA carbon-sequestration amount as well as its properties. With the optimized parameters, RCA was enhanced as CRCA. Both RCA and CRCA were utilized to fully replace natural coarse-aggregate (NCA) in concrete and concrete basic performances were investigated systematically, including strengths, shrinkage and medium transport properties. The results show that the effects of carbon-sequestration time and initial water-content of aggregate on the carbon-sequestration efficiency of RCA are the most significant. The optimized parameters were 30 °C temperature, 0.3 MPa pressure, 24 h time and 25 % initial water content with the maximum amount of carbon-sequestration at 8.42 %. The carbon-sequestration reduced the width of the recycled aggregate interfacial transition zone (ITZ) in concrete, increased the microhardness of ITZ and mortar, and decreased the porosity of CRCA. The CRCA elevated the compressive strength, splitting tensile strength and flexural strength of the concrete (28d) by 13.5 %, 8.5 % and 7.4 %, respectively. The drying shrinkage at 28d of RCA-concrete was decreased by 12.0 % when RCA was replaced with CRCA, however with the CRCA value still 16.2 % higher than that of NCA-concrete. Moreover, CRCA can decrease the medium transport coefficients of water, chloride, and gas in concrete when compared with the RCA-concrete while they are still greater than those of NCA-concrete. © 2024 Elsevier Ltd
Keyword ：
Carbon Carbon Chlorine compounds Chlorine compounds Compressive strength Compressive strength Concrete aggregates Concrete aggregates Durability Durability Porosity Porosity Recycling Recycling Shrinkage Shrinkage Tensile strength Tensile strength
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| GB/T 7714 | Qian, Rusheng , Lin, Wan-Wendner , Yang, Chengqi et al. Investigations on carbon-sequestration optimization of recycled coarse-aggregate and its effects on concrete performances [J]. | Journal of Building Engineering , 2024 , 90 . |
| MLA | Qian, Rusheng et al. "Investigations on carbon-sequestration optimization of recycled coarse-aggregate and its effects on concrete performances" . | Journal of Building Engineering 90 (2024) . |
| APA | Qian, Rusheng , Lin, Wan-Wendner , Yang, Chengqi , Zhao, Ruze , Ye, Zhibo , Kong, Deyu et al. Investigations on carbon-sequestration optimization of recycled coarse-aggregate and its effects on concrete performances . | Journal of Building Engineering , 2024 , 90 . |
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The steel slag and ground granulated blast furnace slag with high fineness exhibit synergistic effects on hydration progress and can be introduced into concrete in high volume. In this paper, the simulated pore solution (SPS) of ternary cement incorporating ultrafine steel slag (US) and ultrafine ground granulated blast furnace slag (UG) was prepared to examine the passivation behavior of the HRB400 reinforcing steel under SPS. It is found that the rapid growth of passive films occurs primarily within the initial 2–3 days after immersion in the SPS, while the compaction of passive films takes place mainly at the later stages. The open circuit potential and charge transfer resistance of the passive films initially increase and then decrease with the continuous rise in the US content. The Fe2O3 constitutes a significant portion of the passive films above the steels treated with the SPS irrespective of US dosages, whereas the content of FeO is highly influenced by US dosages. The UG-US-C pore solution could enhance the passivation behavior because of lower Ca2+ and higher Na+. In case of UG/US ratio at 2:3, the passive film exhibits the greatest thickness at 7.5 nm and meanwhile with the highest compaction and the least roughness. © 2024 Elsevier Ltd
Keyword ：
Blast furnaces Blast furnaces Compaction Compaction Passivation Passivation Slag cement Slag cement
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| GB/T 7714 | Yang, Zhengxian , Zheng, Mingye , Xiong, Xiaoli et al. Passivation behavior of reinforcement in simulated pore solutions of composite cement incorporating ultrafine steel slag and blast furnace slag [J]. | Journal of Building Engineering , 2024 , 97 . |
| MLA | Yang, Zhengxian et al. "Passivation behavior of reinforcement in simulated pore solutions of composite cement incorporating ultrafine steel slag and blast furnace slag" . | Journal of Building Engineering 97 (2024) . |
| APA | Yang, Zhengxian , Zheng, Mingye , Xiong, Xiaoli , Zhang, Yong , Briseghella, Bruno , Marano, Giuseppe Carlo . Passivation behavior of reinforcement in simulated pore solutions of composite cement incorporating ultrafine steel slag and blast furnace slag . | Journal of Building Engineering , 2024 , 97 . |
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This paper presents a comprehensive investigation on the positive potential of steel slag (SS) to mitigate the autogenous shrinkage of alkali-activated slag (AAS) while maintaining a reasonably high strength. Changes of the physicochemical properties of AAS with the addition of SS were examined in terms of hydration heat, autogenous shrinkage, chemical shrinkage, internal relative humidity (RH) and mechanical behaviors. The microstructure of AAS-SS systems was characterized using X-ray diffraction, thermogravimetric analysis and nitrogen adsorption techniques. The shrinkage mechanism and quantification approach of the AAS-SS systems were discussed, in addition to a sustainability assessment. The results indicate that the 7-day autogenous shrinkage of AAS paste was decreased by 16 %, 35 % and 42 % when SS was incorporated by 15 %, 30 % and 45 % respectively, owing to the obviously slower hydration and higher internal RH at the early age. Meanwhile, the inclusion of SS substantially mitigates the chemical shrinkage and reduces the pores below 50 nm, thereby significantly decreasing the capillary pressure associated with smaller water-filled pore sizes. Substitutions of blast furnace slag by up to 45 % SS enable to reduce CO2 emissions by 18.4 kg/m3 and decrease autogenous shrinkage by 42 % without obvious compromise in the loss of elastic modulus and compressive strength. © 2024 Elsevier Ltd
Keyword ：
Atomic absorption spectrometry Atomic absorption spectrometry Blast furnaces Blast furnaces Compressive strength Compressive strength Gas adsorption Gas adsorption Hydration Hydration Physicochemical properties Physicochemical properties Pore size Pore size Shrinkage Shrinkage Slags Slags Sustainable development Sustainable development Thermogravimetric analysis Thermogravimetric analysis
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| GB/T 7714 | Li, Kang , Yang, Zhengxian , Nicolaides, Demetris et al. Autogenous shrinkage and sustainability assessment of alkali-activated slag incorporating steel slag [J]. | Construction and Building Materials , 2024 , 438 . |
| MLA | Li, Kang et al. "Autogenous shrinkage and sustainability assessment of alkali-activated slag incorporating steel slag" . | Construction and Building Materials 438 (2024) . |
| APA | Li, Kang , Yang, Zhengxian , Nicolaides, Demetris , Liang, Minfei , Briseghella, Bruno , Marano, Giuseppe Carlo et al. Autogenous shrinkage and sustainability assessment of alkali-activated slag incorporating steel slag . | Construction and Building Materials , 2024 , 438 . |
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Utilizations of industrial byproducts and wastes as much as possible, together with desirable durability, are essential to sustainable development of building materials. In this work, the chloride diffusion behavior of alkali -activated steel slag (SS) and ultrafine blast furnace slag (UFS) is studied, towards deeper insights into the effect of electrical double layer on the resistance to chloride penetration. The microstructure improvement of alkali -activated SS with increasing addition of UFS was examined by means of X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, mercury intrusion porosimetry and nitrogen sorption. The zeta potentials above the pore surface of various alkali -activated SS-UFS systems were measured and compared. The electrostatic resistance of the electrical double layer to chloride diffusion was analyzed and discussed. Results indicate that UFS dosages above 40% substantially refines the pore structure of alkali -activated SS and then the mechanism governing chloride penetration shifts from capillary transport to gel transport. The exposure of higher chloride sodium concentration results in the pore surface of alkali -activated SS-UFS systems to be less negatively charged and the zeta potential is reversed to be positive value after continuous ion exchange between sodium and calcium. The presence of UFS can remarkably increase the proportion of physically bound chloride that attains approximately 80% of the total binding capacity. The impediment of electrical double layer to chloride diffusivity becomes increasingly pronounced with pore structure refinement, especially for mixtures with diffusion coefficients below 5 x 10 -12 m 2 /s obtained based on Fick ' s law of diffusion.
Keyword ：
Alkali-activated system Alkali-activated system Electrical double layer Electrical double layer Nanoscale chloride transport Nanoscale chloride transport Steel slag Steel slag Ultrafine blast furnace slag Ultrafine blast furnace slag Zeta potential Zeta potential
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| GB/T 7714 | Zhang, Yong , Xu, Xianqiang , Wang, Zhendi et al. Nanoscale chloride diffusion in alkali-activated steel slag and ultrafine blast furnace slag considering the electrical double layer effect [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 88 . |
| MLA | Zhang, Yong et al. "Nanoscale chloride diffusion in alkali-activated steel slag and ultrafine blast furnace slag considering the electrical double layer effect" . | JOURNAL OF BUILDING ENGINEERING 88 (2024) . |
| APA | Zhang, Yong , Xu, Xianqiang , Wang, Zhendi , Yang, Zhengxian , Qian, Rusheng , Marano, Giuseppe Carlo . Nanoscale chloride diffusion in alkali-activated steel slag and ultrafine blast furnace slag considering the electrical double layer effect . | JOURNAL OF BUILDING ENGINEERING , 2024 , 88 . |
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The nano-engineered cementitious composites (NCC) were prepared using g-C3N4/CoAl-LDH nanoflower (nano-CN/L), in combination with mineral admixtures including fly ash (FA), metakaolin (MK), and ground granulated blast furnace slag (GGBFS). The synergistic effects and mechanisms of nano-CN/L and mineral admixtures on the mechanical, chloride penetration resistance and air purification properties of NCC were investigated. The results show that nano-CN/L promotes the early hydration of cementitious materials and improves the composition and morphology of C-S-H gel. Furthermore, the filling effect of nano-CN/L significantly optimizes the pore structure and interfacial crack width of NCC, thereby eliminating the adverse impact of FA, MK, and GGBFS on its early mechanical strengths. Additionally, nano-CN/L enhances the chloride penetration resistance and NOx removal properties of NCC through its strong ion adsorption and photocatalytic activity, respectively. Incorporating 0.9 % nano-CN/L by mass of cementitious materials reduces the chloride diffusion coefficient of NCC at curing age of 56d by 26.9 % and increases the NOx removal ratio by 11 times. The 7d's compressive and flexural strengths of NCC increase by 13.6 % and 4.6 %, respectively, compared to the one without nano-CN/L. As a novel multifunctional nanomaterial, nano-CN/L not only provides a new pathway for extending the service life of cementitious composites, but also injects new momentum into their environmental-friendly development. © 2024 Elsevier Ltd
Keyword ：
Air cleaners Air cleaners Blast furnaces Blast furnaces Chlorination Chlorination Compressive strength Compressive strength Nanoclay Nanoclay Nanoflowers Nanoflowers
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| GB/T 7714 | Lu, Lin , Yang, Zhengxian , Ning, Pingping et al. Synergistic enhancement of g-C3N4/CoAl-LDH nanoflower and mineral admixtures on the properties of nano-engineered cementitious composites [J]. | Construction and Building Materials , 2024 , 450 . |
| MLA | Lu, Lin et al. "Synergistic enhancement of g-C3N4/CoAl-LDH nanoflower and mineral admixtures on the properties of nano-engineered cementitious composites" . | Construction and Building Materials 450 (2024) . |
| APA | Lu, Lin , Yang, Zhengxian , Ning, Pingping , Marano, Giuseppe Carlo , Zhang, Yong . Synergistic enhancement of g-C3N4/CoAl-LDH nanoflower and mineral admixtures on the properties of nano-engineered cementitious composites . | Construction and Building Materials , 2024 , 450 . |
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Sodium silicate activators derived from silica-rich wastes have attracted increasing attention owing to their promotion on the sustainable production and development of alkali-activated materials (AAM). This paper presents the research pro-gress on the feasibility of using silica-rich wastes-derived sodium silicate activator as an alternative to commercial sodium silicate activator in AAM. The basic factors affecting the quality of silica-rich wastes-derived sodium silicate activator are reviewed. The structure features between commercial sodium silicate and derivative sodium silicate are addressed and compared. Influences of the two different sodium silicates on flowability, mechanical properties, microstructure and du-rability are summarized and discussed. Previous studies reveal that utilizations of amorphously rich SiO2 containing ma-terials, together with proper preparation technology, enable to produce highly reactive sodium silicate activators and as a consequence to obtain materials with comparable or even better performances as compared to the commercially available sodium silicate-AAM. Recommendations for future investigation are provided eventually.
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| GB/T 7714 | Lin, Jinming , Zhang, Yong , Yang, Zhengxian . A Review of Recent Advances in Alkali-activated Materials from Silica-rich Wastes Derived Sodium Silicate Activators [J]. | JOURNAL OF ADVANCED CONCRETE TECHNOLOGY , 2023 , 21 (3) : 189-203 . |
| MLA | Lin, Jinming et al. "A Review of Recent Advances in Alkali-activated Materials from Silica-rich Wastes Derived Sodium Silicate Activators" . | JOURNAL OF ADVANCED CONCRETE TECHNOLOGY 21 . 3 (2023) : 189-203 . |
| APA | Lin, Jinming , Zhang, Yong , Yang, Zhengxian . A Review of Recent Advances in Alkali-activated Materials from Silica-rich Wastes Derived Sodium Silicate Activators . | JOURNAL OF ADVANCED CONCRETE TECHNOLOGY , 2023 , 21 (3) , 189-203 . |
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The surface of long-term exposed building materials usually shows serious deterioration under continuous environmental erosion, which can greatly shorten the service life of building structures. The application prospect of multifunctional photocatalytic materials in civil engineering is promising but the engineering application is still limited due to the inherent defects of traditional photocatalytic materials. In this paper, the ordinary Portland cement (OPC) and alkali activated slag (AAS) mortar samples were prepared with a photocatalytic coating incorporating novel core@shell nanospheres which feature with TiO2 core and CoAl-layered double hydroxide shell (TiO2@CoAl-LDH). The surface roughness, microhardness, contact angle and capillary water absorption of coated and uncoated mortars were analyzed and characterized to explore the effect of photo-catalytic coating on surface properties. The photocatalytic activity and photo-induced hydrophilicity of the coated mortar were investigated by degrading methylene blue and contact angle tests. A simulated rainwater washing test was designed to evaluate the long-term stability of photocatalytic coatings on mortar substrate. The results show that compared with unwashed coated mortar, the coated mortar after rainwater washing can still maintain a higher photocatalytic activity, whereby the surface hydrophilicity was increased with the decrease of the surface roughness and capillary water absorption. As a newly developed protective coating material, TiO2@CoAl-LDH is expected to confer multifunctional properties to the cementitious materials.
Keyword ：
Alkali activated slag mortar Alkali activated slag mortar Photo-hydrophilicity Photo-hydrophilicity Rainwater washing Rainwater washing Self-cleaning Self-cleaning TiO 2 @CoAl-LDH core@shell nanospheres TiO 2 @CoAl-LDH core@shell nanospheres
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| GB/T 7714 | Yang, Zhengxian , Xu, Jiankun , Wang, Wencheng et al. Surface properties and de-polluting performance of a photocatalytic coating incorporating novel core@shell nanospheres for cementitious substrate [J]. | CEMENT & CONCRETE COMPOSITES , 2023 , 139 . |
| MLA | Yang, Zhengxian et al. "Surface properties and de-polluting performance of a photocatalytic coating incorporating novel core@shell nanospheres for cementitious substrate" . | CEMENT & CONCRETE COMPOSITES 139 (2023) . |
| APA | Yang, Zhengxian , Xu, Jiankun , Wang, Wencheng , Zhang, Yong , Yang, Lu . Surface properties and de-polluting performance of a photocatalytic coating incorporating novel core@shell nanospheres for cementitious substrate . | CEMENT & CONCRETE COMPOSITES , 2023 , 139 . |
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采用钢渣矿渣复合粉替代硅酸盐水泥,钢渣骨料替代天然骨料制备碱激发钢渣-矿渣透水混凝土(ASSPC),研究不同因素下ASSPC抗压强度的变化规律,结合XRD、TG、FESEM和SEM-EDS表征ASSPC硬化胶凝材料和界面过渡区(ITZ)的微观性能,阐明胶凝材料对ASSPC力学性能发展的作用及影响机理.结果表明,ASSPC具备较高的早期抗压强度,随矿渣-钢渣掺比提高,ASSPC的抗压强度先上升后下降.采用钢渣作为骨料制备透水混凝土,可有效优化ITZ的微观性能,改善ASSPC的力学性能.随着水胶比(0.24～0.32)提高,ASSPC的抗压强度先增大后减小.
Keyword ：
力学性能 力学性能 流动性 流动性 界面过渡区 界面过渡区 碱激发钢渣-矿渣胶凝材料 碱激发钢渣-矿渣胶凝材料 透水混凝土 透水混凝土 钢渣骨料 钢渣骨料
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| GB/T 7714 | 陈尚鸿 , 林佳福 , 杨政险 et al. 钢渣-矿渣透水混凝土力学性能的试验研究 [J]. | 硅酸盐通报 , 2023 , 42 (5) : 1767-1777 . |
| MLA | 陈尚鸿 et al. "钢渣-矿渣透水混凝土力学性能的试验研究" . | 硅酸盐通报 42 . 5 (2023) : 1767-1777 . |
| APA | 陈尚鸿 , 林佳福 , 杨政险 , 张勇 , 熊晓立 . 钢渣-矿渣透水混凝土力学性能的试验研究 . | 硅酸盐通报 , 2023 , 42 (5) , 1767-1777 . |
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In this work, steel slag (SS), blast furnace slag (BFS), ultrafine SS (USS) and ultrafine BFS (UBFS), with fineness of 407, 450, 748 and 760 m2/kg respectively, were prepared. The influences of SS and BFS fineness on cementitious systems were studied from perspectives of the hydration process, microstructure formation as well as fluidity and strength. The results show that the BFS with a high fineness exhibits a high reactivity while an adverse effect on the fluidity. A high fineness of SS could have a negative impact on the hydration of blended cement. The addition of BFS, regardless of the fineness, substantially increases the number of small pores below 20 nm and enhances the compressive strength of cementitious systems. The combination of SS and BFS can decrease the Ca/Si ratio and raise the Al/Si ratio of the main hydrates C(-A)-S-H, while the fineness does not have a great impact on the chemical composition of C(-A)-S-H. Compared to plain cement, the gap-graded ternary cement prepared with 25 wt% cement, 39 wt% SS and 36 wt % UBFS is featured with a lower embodied energy and CO2 emission without compromising the early and late performances.
Keyword ：
Blast furnace slag Blast furnace slag Chemical composition Chemical composition Fineness Fineness Hydration Hydration Microstructure Microstructure Steel slag Steel slag
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| GB/T 7714 | Yang, Zhengxian , Xiong, Xiaoli , Chen, Shanghong et al. Effect of fineness on the hydration and microstructure of cementitious materials with high-volume steel slag and blast furnace slag [J]. | JOURNAL OF BUILDING ENGINEERING , 2023 , 72 . |
| MLA | Yang, Zhengxian et al. "Effect of fineness on the hydration and microstructure of cementitious materials with high-volume steel slag and blast furnace slag" . | JOURNAL OF BUILDING ENGINEERING 72 (2023) . |
| APA | Yang, Zhengxian , Xiong, Xiaoli , Chen, Shanghong , Briseghella, Bruno , Marano, Giuseppe Carlo , Zhang, Yong . Effect of fineness on the hydration and microstructure of cementitious materials with high-volume steel slag and blast furnace slag . | JOURNAL OF BUILDING ENGINEERING , 2023 , 72 . |
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