The Experts below are selected from a list of 10176 Experts worldwide ranked by ideXlab platform

Jinmei Li - One of the best experts on this subject based on the ideXlab platform.

  • properties of mortars made by uncalcined fgd gypsum fly ash ground granulated blast furnace slag Composite Binder
    Waste Management, 2012
    Co-Authors: Shi Yun Zhong, Kun Ni, Jinmei Li
    Abstract:

    Highlights: Black-Right-Pointing-Pointer The mortar with uncalcined FGD gypsum has suitable workability. Black-Right-Pointing-Pointer The strength of mortar with uncalcined FGD gypsum is higher than that of mortar without uncalcined FGD gypsum. Black-Right-Pointing-Pointer The dry shrinkage of mortar with uncalcined FGD gypsum is lower than that of mortar without uncalcined FGD gypsum. Black-Right-Pointing-Pointer The leaching of sulfate ion of mortar is studied. - Abstract: A series of novel mortars were developed from Composite Binder of uncalcined FGD gypsum, fly ash (FA) and ground granulated blast furnace slag (GGBFS) for the good utilization of flue gas desulphurization (FGD) gypsum. At a fixed ratio (20%) of GGBFS to the Composite Binder, keeping consistency of the mortar between 9.5 and 10.0 cm, the properties of the Composite mortar were studied. The results show that higher water/Binder (W/B) is required to keep the consistency when increasing the percentage of FGD gypsum. No obvious influences of the W/B and content of FGD gypsum on the bleeding of paste were observed which keeps lower than 2% under all experimental conditions tried. The highest compressive and flexural strengths (ratio is 20% FGD gypsum, 20% GGBFS and 60% FA) are 22.6 and 4.3 MPa at 28 days, respectively. Scanning electronmore » microscopy (SEM) and X-ray diffraction (XRD) results indicate that massive ettringite crystals and C-S-H gels exist in the hydration products. At 90 days the mortars with FGD gypsum is dramatically smaller drying shrinkage (563-938 micro strain) than that without FGD gypsum (about 2250 micro strain). The release of the SO{sub 4}{sup 2-} from the mortar was analyzed, indicating that the dissolution of sulfate increases with FGD gypsum. The concentration of SO{sub 4}{sup 2-} releasing from the mortar with 10% FGD gypsum is almost equal to that obtained from the mortar without FGD gypsum. The release of SO{sub 4}{sup 2-} from the mortar with 20% FGD gypsum is 9200 mg{center_dot}m{sup -2}, which is lower than that from the mortar with 95% cement clinker and 5% FGD gypsum.« less

Shi Yun Zhong - One of the best experts on this subject based on the ideXlab platform.

  • the strength and microstructure of high content fgd gypsum fly ash ground granulated blast furnace slag Composite Binder
    Applied Mechanics and Materials, 2014
    Co-Authors: Kun Ni, Shi Yun Zhong, Yan Gang Zhang
    Abstract:

    In this paper, FGD gypsum mixed with fly ash (FA) and ground granulated blast furnace slag (GGBFS) was used as a Composite Binder. The strength experiments of range analysis and analysis of variance (ANOVA) showed that the optimal proportion of FGD gypsum, FA and GGBFS was 6:3:4. The study of microstructure of hardened paste proved that the hydration product was mainly C-S-H gels and ettringite, and some ettringite crystals grew from C-S-H gels.

  • properties of mortars made by uncalcined fgd gypsum fly ash ground granulated blast furnace slag Composite Binder
    Waste Management, 2012
    Co-Authors: Shi Yun Zhong, Kun Ni, Jinmei Li
    Abstract:

    Highlights: Black-Right-Pointing-Pointer The mortar with uncalcined FGD gypsum has suitable workability. Black-Right-Pointing-Pointer The strength of mortar with uncalcined FGD gypsum is higher than that of mortar without uncalcined FGD gypsum. Black-Right-Pointing-Pointer The dry shrinkage of mortar with uncalcined FGD gypsum is lower than that of mortar without uncalcined FGD gypsum. Black-Right-Pointing-Pointer The leaching of sulfate ion of mortar is studied. - Abstract: A series of novel mortars were developed from Composite Binder of uncalcined FGD gypsum, fly ash (FA) and ground granulated blast furnace slag (GGBFS) for the good utilization of flue gas desulphurization (FGD) gypsum. At a fixed ratio (20%) of GGBFS to the Composite Binder, keeping consistency of the mortar between 9.5 and 10.0 cm, the properties of the Composite mortar were studied. The results show that higher water/Binder (W/B) is required to keep the consistency when increasing the percentage of FGD gypsum. No obvious influences of the W/B and content of FGD gypsum on the bleeding of paste were observed which keeps lower than 2% under all experimental conditions tried. The highest compressive and flexural strengths (ratio is 20% FGD gypsum, 20% GGBFS and 60% FA) are 22.6 and 4.3 MPa at 28 days, respectively. Scanning electronmore » microscopy (SEM) and X-ray diffraction (XRD) results indicate that massive ettringite crystals and C-S-H gels exist in the hydration products. At 90 days the mortars with FGD gypsum is dramatically smaller drying shrinkage (563-938 micro strain) than that without FGD gypsum (about 2250 micro strain). The release of the SO{sub 4}{sup 2-} from the mortar was analyzed, indicating that the dissolution of sulfate increases with FGD gypsum. The concentration of SO{sub 4}{sup 2-} releasing from the mortar with 10% FGD gypsum is almost equal to that obtained from the mortar without FGD gypsum. The release of SO{sub 4}{sup 2-} from the mortar with 20% FGD gypsum is 9200 mg{center_dot}m{sup -2}, which is lower than that from the mortar with 95% cement clinker and 5% FGD gypsum.« less

  • Properties of mortars made by uncalcined FGD gypsum-fly ash-ground granulated blast furnace slag Composite Binder
    Waste Management, 2012
    Co-Authors: Shi Yun Zhong
    Abstract:

    A series of novel mortars were developed from Composite Binder of uncalcined FGD gypsum, fly ash (FA) and ground granulated blast furnace slag (GGBFS) for the good utilization of flue gas desulphurization (FGD) gypsum. At a fixed ratio (20%) of GGBFS to the Composite Binder, keeping consistency of the mortar between 9.5 and 10.0 cm, the properties of the Composite mortar were studied. The results show that higher water/Binder (W/B) is required to keep the consistency when increasing the percentage of FGD gypsum. No obvious influences of the W/B and content of FGD gypsum on the bleeding of paste were observed which keeps lower than 2% under all experimental conditions tried. The highest compressive and flexural strengths (ratio is 20% FGD gypsum, 20% GGBFS and 60% FA) are 22.6 and 4.3 MPa at 28 days, respectively. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) results indicate that massive ettringite crystals and C-S-H gels exist in the hydration products. At 90 days the mortars with FGD gypsum is dramatically smaller drying shrinkage (563-938 micro strain) than that without FGD gypsum (about 2250 micro strain). The release of the SO(4)(2-) from the mortar was analyzed, indicating that the dissolution of sulfate increases with FGD gypsum. The concentration of SO(4)(2-) releasing from the mortar with 10% FGD gypsum is almost equal to that obtained from the mortar without FGD gypsum. The release of SO(4)(2-) from the mortar with 20% FGD gypsum is 9200 mg·m(-2), which is lower than that from the mortar with 95% cement clinker and 5% FGD gypsum.

Yingbiao Peng - One of the best experts on this subject based on the ideXlab platform.

  • a new type of wc co ni al cemented carbide grain size and morphology of γ strengthened Composite Binder phase
    Scripta Materialia, 2017
    Co-Authors: Jianzhan Long, Weibin Zhang, Yaru Wang, Zhongjian Zhang, Kaiming Cheng, Yingbiao Peng
    Abstract:

    In contrast to the much larger grain size of the Binder phase in traditional WC–Co cemented carbide, we have achieved a significantly reduced grain size of the γ′-Ni3Al strengthened Composite Binder phase in WC–Co–Ni–Al cemented carbide. Based on thermodynamic calculations, decisive experiments and microstructure characterizations, the formation mechanism for grain size of Binder phase in WC–Co–Ni–Al cemented carbide has been clarified, and the related boundary morphology and performance characteristics are discussed.

  • a thermodynamic description of the al co ni system and site occupancy in co alni3 Composite Binder phase
    Journal of Alloys and Compounds, 2016
    Co-Authors: Yaru Wang, Jianzhan Long, Yingbiao Peng, Peng Zhou, Yong Du, Bo Sundman, Tao Xu, Zhongjian Zhang
    Abstract:

    Abstract Phase equilibria of the Al–Co–Ni system is extremely useful for understanding phase behavior of AlNi3-based L12 phases, regarding its attractive properties, such as high-temperature oxidation resistance and corrosion resistance, high hardness and strength. In the present work, all the experimental data about the phase equilibria and thermodynamic properties of the Al–Co–Ni system were critically evaluated, and a thermodynamic description for this system over the whole composition and temperature ranges was obtained. Most importantly, the ordered/disordered transition between fcc_A1 and L12 phases was described using a four-sublattice (4SL) model. Based on the crystallographic and experimental data, three stable ternary intermetallic phases were described using sublattice model. Two of them were treated as semi-stoichiometric compounds with homogeneity ranges for Co and Ni, and the other one was treated as a stoichiometric compound. The other phases were described by using substitutional solution model. The present work provides a more complete and accurate thermodynamic description compared with previous ones. A reasonable agreement was obtained between calculations and experimental data in the ternary system. The occupancy behavior of Co in AlNi3 is thermodynamically predicted, and the computed occupancy shows a much better fit to the experimental data than previous first-principles calculations. In addition, the composition range of the Co + AlNi3 two-phase region, concerning a new type of Composite Binder for cemented carbides, was found to shift to the Co-rich side with the decrease of the temperature.

  • A thermodynamic description of the Al–Co–Ni system and site occupancy in Co + AlNi3 Composite Binder phase
    Journal of Alloys and Compounds, 2016
    Co-Authors: Yaru Wang, Jianzhan Long, Yingbiao Peng, Peng Zhou, Bo Sundman, Zhongjian Zhang
    Abstract:

    Abstract Phase equilibria of the Al–Co–Ni system is extremely useful for understanding phase behavior of AlNi3-based L12 phases, regarding its attractive properties, such as high-temperature oxidation resistance and corrosion resistance, high hardness and strength. In the present work, all the experimental data about the phase equilibria and thermodynamic properties of the Al–Co–Ni system were critically evaluated, and a thermodynamic description for this system over the whole composition and temperature ranges was obtained. Most importantly, the ordered/disordered transition between fcc_A1 and L12 phases was described using a four-sublattice (4SL) model. Based on the crystallographic and experimental data, three stable ternary intermetallic phases were described using sublattice model. Two of them were treated as semi-stoichiometric compounds with homogeneity ranges for Co and Ni, and the other one was treated as a stoichiometric compound. The other phases were described by using substitutional solution model. The present work provides a more complete and accurate thermodynamic description compared with previous ones. A reasonable agreement was obtained between calculations and experimental data in the ternary system. The occupancy behavior of Co in AlNi3 is thermodynamically predicted, and the computed occupancy shows a much better fit to the experimental data than previous first-principles calculations. In addition, the composition range of the Co + AlNi3 two-phase region, concerning a new type of Composite Binder for cemented carbides, was found to shift to the Co-rich side with the decrease of the temperature.

Qiang Wang - One of the best experts on this subject based on the ideXlab platform.

  • influence of alkali activators on the early hydration of cement based Binders under steam curing condition
    Journal of Thermal Analysis and Calorimetry, 2017
    Co-Authors: Dengquan Wang, Qiang Wang, Zhenggang Fang
    Abstract:

    The effects of water glass, NaOH, Na2SO4, and Na2CO3 on the early hydration of plain cement and two Composite Binders incorporating 40 mass% ground granulated blast furnace slag (GGBS) and 40 mass% fly ash under the steam curing temperature of 60 °C were investigated. Meanwhile, a 20 °C curing condition was set as a reference. The results showed that water glass, NaOH, and Na2CO3 can improve the exothermic rates of the Binders at the acceleration period and promote the reaction of GGBS and fly ash. However, the alkali activators inhibited the hydration of Portland cement at the deceleration period, which was more significant at 60 °C. Thus, the alkali activators cannot efficiently increase the cumulative hydration heat within 16 h under steam curing or even appear to decrease. Na2SO4 shows a better performance than the other three alkalis in the early hydration of the Composite Binders due to its promotion on the formation of AFt, but it cannot efficiently increase the cumulative hydration heat too. The results also showed that all of the alkali activators significantly decreased the form-removal strength of cement–GGBS Composite Binder. For cement–fly ash Composite Binder, the form-removal strengths of the samples activated by a low concentration of water glass and high concentration of Na2SO4 were close to that reacted with water, while the form-removal strengths of the samples activated by other alkaline solutions were lower. Overall, the four alkali activators cannot improve the form-removal strength of steam-cured mortar containing a large volume of mineral admixtures.

  • a comparison of early hydration properties of cement steel slag Binder and cement limestone powder Binder
    Journal of Thermal Analysis and Calorimetry, 2014
    Co-Authors: Qiang Wang
    Abstract:

    The early hydration properties of cement–steel slag Composite Binder and cement–limestone powder Composite Binder were compared in this study by determining the hydration heat of Binder within 3 days, the pore structure of paste and the compressive strength of mortar at the age of 3 days. Results show that at the curing temperature of 25 °C, the early hydration heat of the Binder containing steel slag is smaller, and the early pore structure of the paste containing steel slag is coarser, but the early compressive strength of the mortar containing steel slag is higher compared with the mix containing limestone powder. Though the early reaction degree of steel slag is low, its chemical contribution to the strength of mortar cannot be neglected. At the curing temperature of 50 °C, the early hydration heat of the Binder containing steel slag is larger, and the early pore structure of the paste containing steel slag is finer, and the early compressive strength of the mortar containing steel slag is even higher compared with the mix containing limestone powder. Raising curing temperature can enhance the role played by steel slag more significantly than that played by limestone powder in the hydration and hardening of the Composite Binder.

Zhongjian Zhang - One of the best experts on this subject based on the ideXlab platform.

  • a new type of wc co ni al cemented carbide grain size and morphology of γ strengthened Composite Binder phase
    Scripta Materialia, 2017
    Co-Authors: Jianzhan Long, Weibin Zhang, Yaru Wang, Zhongjian Zhang, Kaiming Cheng, Yingbiao Peng
    Abstract:

    In contrast to the much larger grain size of the Binder phase in traditional WC–Co cemented carbide, we have achieved a significantly reduced grain size of the γ′-Ni3Al strengthened Composite Binder phase in WC–Co–Ni–Al cemented carbide. Based on thermodynamic calculations, decisive experiments and microstructure characterizations, the formation mechanism for grain size of Binder phase in WC–Co–Ni–Al cemented carbide has been clarified, and the related boundary morphology and performance characteristics are discussed.

  • a thermodynamic description of the al co ni system and site occupancy in co alni3 Composite Binder phase
    Journal of Alloys and Compounds, 2016
    Co-Authors: Yaru Wang, Jianzhan Long, Yingbiao Peng, Peng Zhou, Yong Du, Bo Sundman, Tao Xu, Zhongjian Zhang
    Abstract:

    Abstract Phase equilibria of the Al–Co–Ni system is extremely useful for understanding phase behavior of AlNi3-based L12 phases, regarding its attractive properties, such as high-temperature oxidation resistance and corrosion resistance, high hardness and strength. In the present work, all the experimental data about the phase equilibria and thermodynamic properties of the Al–Co–Ni system were critically evaluated, and a thermodynamic description for this system over the whole composition and temperature ranges was obtained. Most importantly, the ordered/disordered transition between fcc_A1 and L12 phases was described using a four-sublattice (4SL) model. Based on the crystallographic and experimental data, three stable ternary intermetallic phases were described using sublattice model. Two of them were treated as semi-stoichiometric compounds with homogeneity ranges for Co and Ni, and the other one was treated as a stoichiometric compound. The other phases were described by using substitutional solution model. The present work provides a more complete and accurate thermodynamic description compared with previous ones. A reasonable agreement was obtained between calculations and experimental data in the ternary system. The occupancy behavior of Co in AlNi3 is thermodynamically predicted, and the computed occupancy shows a much better fit to the experimental data than previous first-principles calculations. In addition, the composition range of the Co + AlNi3 two-phase region, concerning a new type of Composite Binder for cemented carbides, was found to shift to the Co-rich side with the decrease of the temperature.

  • A thermodynamic description of the Al–Co–Ni system and site occupancy in Co + AlNi3 Composite Binder phase
    Journal of Alloys and Compounds, 2016
    Co-Authors: Yaru Wang, Jianzhan Long, Yingbiao Peng, Peng Zhou, Bo Sundman, Zhongjian Zhang
    Abstract:

    Abstract Phase equilibria of the Al–Co–Ni system is extremely useful for understanding phase behavior of AlNi3-based L12 phases, regarding its attractive properties, such as high-temperature oxidation resistance and corrosion resistance, high hardness and strength. In the present work, all the experimental data about the phase equilibria and thermodynamic properties of the Al–Co–Ni system were critically evaluated, and a thermodynamic description for this system over the whole composition and temperature ranges was obtained. Most importantly, the ordered/disordered transition between fcc_A1 and L12 phases was described using a four-sublattice (4SL) model. Based on the crystallographic and experimental data, three stable ternary intermetallic phases were described using sublattice model. Two of them were treated as semi-stoichiometric compounds with homogeneity ranges for Co and Ni, and the other one was treated as a stoichiometric compound. The other phases were described by using substitutional solution model. The present work provides a more complete and accurate thermodynamic description compared with previous ones. A reasonable agreement was obtained between calculations and experimental data in the ternary system. The occupancy behavior of Co in AlNi3 is thermodynamically predicted, and the computed occupancy shows a much better fit to the experimental data than previous first-principles calculations. In addition, the composition range of the Co + AlNi3 two-phase region, concerning a new type of Composite Binder for cemented carbides, was found to shift to the Co-rich side with the decrease of the temperature.