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To maximize the utilization of red mud in geopolymers, a red mud–metakaolin (RM-MK) geopolymer and red mud–fly ash (RM-FA) geopolymer were prepared, respectively. The effects of red mud content on the compressive strength and microstructure of the geopolymers were investigated under three different curing conditions. The results showed that the strength of the geopolymer decreased linearly with an increase in the red mud content, whether curing at room temperature or 80 °C. Surprisingly, curing in an autoclave, the appropriate amount of red mud had a favorable impact on the mechanical properties of the geopolymers. When the amount of red mud was 50%, the strength of the RM-MK geopolymer reached its highest compressive strength, 36.3 MPa, and the strength of the RM-FA geopolymer reached its highest at 31.7 MPa. Compared with curing at low temperature, curing the red mud-based geopolymers under a higher temperature and higher pressure can maximize the use of red mud. XRD analysis indicated that zeolite minerals formed. The SEM results showed that the geopolymers cured in an autoclave had a dense structure.
Tao Ai; Danni Zhong; Yao Zhang; Jingshan Zong; Xin Yan; Yanhui Niu. The Effect of Red Mud Content on the Compressive Strength of Geopolymers under Different Curing Systems. Buildings 2021, 11, 298 .
AMA StyleTao Ai, Danni Zhong, Yao Zhang, Jingshan Zong, Xin Yan, Yanhui Niu. The Effect of Red Mud Content on the Compressive Strength of Geopolymers under Different Curing Systems. Buildings. 2021; 11 (7):298.
Chicago/Turabian StyleTao Ai; Danni Zhong; Yao Zhang; Jingshan Zong; Xin Yan; Yanhui Niu. 2021. "The Effect of Red Mud Content on the Compressive Strength of Geopolymers under Different Curing Systems." Buildings 11, no. 7: 298.
Ba0.6Sr0.4TiO3 (BST) ceramic materials have been widely used in the field of multilayer ceramic capacitors. Surface modification through the surface coating to form a heterogeneous layer could effectively improve the dielectric properties. In this work, BST powders were prepared by a co-precipitation method. The effects of reaction conditions on the microstructure of the BST powder were investigated. The reaction temperatures significantly affected the morphology of BST powder, and the rhombic-type particles were obtained with the reaction temperature around 80 °C. Meanwhile, the [email protected]2O3 was prepared by the chemical precipitation method using BST powders with rhombic-type microstructure as “core”, and the so-called “core-shell” microstructure was confirmed in the [email protected]2O3 powder. Then, [email protected] wt%Fe2O3 (x = 2.5, 5, 7.5, and 10, denoting the different content of Fe2O3) ceramics were further prepared, and the influence of “core-shell” structure on the phase structure, microstructure, and dielectric properties was investigated. With the increasing of Fe2O3 content, the ferroelectric–paraelectric phase transition temperature shifts toward lower temperatures, and dielectric peaks gradually become broad and frequency-dependent, which may be due to inconsistent chemical composition from core to shell.
Zhuo Li; Chenbo Wang; Zixuan Wang; Dandan Zhang; Yangxiao Qin; Qiangbin Yang; Zhuo Wang; Peng Zhao; Xinshuai Ma; Minghan Li; Tao Ai; Xin Yan; Yanhui Niu; Biaolin Peng; Shikuan Sun; Dawei Wang. Core-Shell Structure and Dielectric Properties of Ba0.6Sr0.4TiO3@ Fe2O3 Ceramics Prepared by Co-Precipitation Method. Crystals 2021, 11, 623 .
AMA StyleZhuo Li, Chenbo Wang, Zixuan Wang, Dandan Zhang, Yangxiao Qin, Qiangbin Yang, Zhuo Wang, Peng Zhao, Xinshuai Ma, Minghan Li, Tao Ai, Xin Yan, Yanhui Niu, Biaolin Peng, Shikuan Sun, Dawei Wang. Core-Shell Structure and Dielectric Properties of Ba0.6Sr0.4TiO3@ Fe2O3 Ceramics Prepared by Co-Precipitation Method. Crystals. 2021; 11 (6):623.
Chicago/Turabian StyleZhuo Li; Chenbo Wang; Zixuan Wang; Dandan Zhang; Yangxiao Qin; Qiangbin Yang; Zhuo Wang; Peng Zhao; Xinshuai Ma; Minghan Li; Tao Ai; Xin Yan; Yanhui Niu; Biaolin Peng; Shikuan Sun; Dawei Wang. 2021. "Core-Shell Structure and Dielectric Properties of Ba0.6Sr0.4TiO3@ Fe2O3 Ceramics Prepared by Co-Precipitation Method." Crystals 11, no. 6: 623.
Nitrogen hybridization is an attractive way to enhance the wettability and electric conductivity of porous carbon, which increases the capacitance of carbon-based supercapacitor, however, there is lack of low-cost methods to prepare the nitrogen-doped porous carbon materials. Herein, a novel facile nitrogen-containing bio-phenolic resin was synthesized by polymerization of the carbamate bio-oil, Phenol and paraformaldehyde. As a precursor of nitrogen-doped porous carbon, the nitrogen-containing bio-phenol resin was activated by the one-step molten-salt method. The resultant nitrogen-doped porous carbon showed a high specific surface area up to 1401 m2·g−1. As a supercapacitor electrode, the nitrogen-doped porous carbons showed specific capacitance of 159 F·g−1 at 0.5 A·g−1. It also exhibited high cyclic stability with 94.8% retention of the initial specific capacitance over 1000 charge-discharge cycles at 1.0 A·g−1. The results suggest that these nitrogen-containing bio-phenol resin provide a new source of nitrogen-doped porous carbon for high-performance supercapacitor electrodes.
Tao Ai; Zhe Wang; Haoran Zhang; Fenghua Hong; Xin Yan; Xinhua Su. Novel Synthesis of Nitrogen-Containing Bio-Phenol Resin and Its Molten Salt Activation of Porous Carbon for Supercapacitor Electrode. Materials 2019, 12, 1986 .
AMA StyleTao Ai, Zhe Wang, Haoran Zhang, Fenghua Hong, Xin Yan, Xinhua Su. Novel Synthesis of Nitrogen-Containing Bio-Phenol Resin and Its Molten Salt Activation of Porous Carbon for Supercapacitor Electrode. Materials. 2019; 12 (12):1986.
Chicago/Turabian StyleTao Ai; Zhe Wang; Haoran Zhang; Fenghua Hong; Xin Yan; Xinhua Su. 2019. "Novel Synthesis of Nitrogen-Containing Bio-Phenol Resin and Its Molten Salt Activation of Porous Carbon for Supercapacitor Electrode." Materials 12, no. 12: 1986.
Aged asphalt can enormously affect the performance of asphalt pavement and cause serious environmental hazards. Microcapsule-modified asphalt is one of the effective means to improve the anti-aging ability of asphalt. In this work, novel sustained-release microcapsules containing rejuvenator were prepared by the solvent evaporation method. The morphology of the microcapsules was characterized by scanning electron microscopy (SEM). The sustained-release properties of the microcapsules were investigated by static thermogravimetric analysis. The physical properties such as penetration, ductility, softening point, and Brookfield viscosity of the original asphalt and microcapsule-modified asphalt were studied. In addition, the viscoelasticity of the original asphalt and microcapsule-modified asphalt was investigated by means of a dynamic shear rheometer (DSR). The results show that the prepared microcapsules have a smooth surface and a complete encapsulation with an average particle size of 60 μm. After the heating treatment (above 140 °C), a large number of micropores were formed on the shell surface of microcapsules, which provided a structural basis for the sustained-release of rejuvenator. The release rate of the rejuvenator was obviously slowed down by the microcapsules. The aging behavior of sustained-release microcapsules containing rejuvenator-modified asphalt can be greatly improved. The enhanced anti-aging properties of sustained-release microcapsule-modified asphalt are attributed to the functions of the rejuvenator which can be slowly released from the micropores on the microcapsules’ surface, after which the light components lost in the original asphalt can be supplemented.
Xin Yan; Guotao Ning; Xiaofeng Wang; Tao Ai; Peng Zhao; Zhenjun Wang. Preparation and Short-Term Aging Properties of Asphalt Modified by Novel Sustained-Release Microcapsules Containing Rejuvenator. Materials 2019, 12, 1122 .
AMA StyleXin Yan, Guotao Ning, Xiaofeng Wang, Tao Ai, Peng Zhao, Zhenjun Wang. Preparation and Short-Term Aging Properties of Asphalt Modified by Novel Sustained-Release Microcapsules Containing Rejuvenator. Materials. 2019; 12 (7):1122.
Chicago/Turabian StyleXin Yan; Guotao Ning; Xiaofeng Wang; Tao Ai; Peng Zhao; Zhenjun Wang. 2019. "Preparation and Short-Term Aging Properties of Asphalt Modified by Novel Sustained-Release Microcapsules Containing Rejuvenator." Materials 12, no. 7: 1122.
Potassium geopolymer (KGP) ceramics are synthesized by the molten salt method. Metakaolin changes to a potassium geopolymer through a reaction with potassium silicate at 80 °C/24 h. Potassium geopolymer, with a silicon to aluminum (Si/Al) molar ratio of 2, turns into a leucite ceramic in molten potassium salt (KCl) at 900 °C/6 h. X-Ray Diffraction analysis of the KGP treated by molten KCl salt shows the amorphous phase change to leucite crystal phase. A scanning electron microscope image of sintered KGP proves that the grain size of the leucite crystal decreases with soaking time. Compared with solid state sintering, liquid molten salt sintering KGP can be more easily formed into dense ceramics at lower temperatures.
Tao Ai; Feng-Hua Hong; Yi-Na Kang; Hao-Ran Zhang; Xin Yan. Synthesis of Monolithic Potassium Geopolymer Ceramics Assisted by Molten Salt. Materials 2019, 12, 461 .
AMA StyleTao Ai, Feng-Hua Hong, Yi-Na Kang, Hao-Ran Zhang, Xin Yan. Synthesis of Monolithic Potassium Geopolymer Ceramics Assisted by Molten Salt. Materials. 2019; 12 (3):461.
Chicago/Turabian StyleTao Ai; Feng-Hua Hong; Yi-Na Kang; Hao-Ran Zhang; Xin Yan. 2019. "Synthesis of Monolithic Potassium Geopolymer Ceramics Assisted by Molten Salt." Materials 12, no. 3: 461.
Zhenjun Wang; Ting Zhang; Mingyu Shao; Tao Ai; Peng Zhao. Investigation on snow-melting performance of asphalt mixtures incorporating with salt-storage aggregates. Construction and Building Materials 2017, 142, 187 -198.
AMA StyleZhenjun Wang, Ting Zhang, Mingyu Shao, Tao Ai, Peng Zhao. Investigation on snow-melting performance of asphalt mixtures incorporating with salt-storage aggregates. Construction and Building Materials. 2017; 142 ():187-198.
Chicago/Turabian StyleZhenjun Wang; Ting Zhang; Mingyu Shao; Tao Ai; Peng Zhao. 2017. "Investigation on snow-melting performance of asphalt mixtures incorporating with salt-storage aggregates." Construction and Building Materials 142, no. : 187-198.
Magnetite tailings (MTs) are waste generated from magnetite processing, which not only occupy lots of land, but also result in severe pollution to the surroundings. In this paper, the MTs were used as a substitution of limestone (LMs) aggregate in asphalt mixtures. Water boiling and residual Marshall stability tests were conducted to study asphalt-aggregate interface adhesion, which was improved by hydrated lime (HL). The effects of MTs on high temperature property, low temperature property and water stability property of asphalt mixtures were evaluated respectively through some indexes, such as dynamic stability, splitting strength at low temperature and freeze–thaw splitting strength ratio. In addition, scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), Infrared spectrometer (IR) and Zeta potential were also adopted to analyze the mechanism. The results show that there are not heavy metal elements and toxic pollution threats in MTs. The HL can improve the asphalt-aggregate interface adhesion and the water stability of the asphalt mixtures with MTs. MTs can improve the high temperature property and slightly decrease splitting strength at low temperature of asphalt mixtures. Freezing-thawing splitting strength ratio increases with the increase of MTs, which is greatly higher 80% requirement in the Chinese specification. Therefore, the asphalt mixtures containing MTs present excellent properties and MTs can be widely used as substitution of natural aggregates in asphalt mixtures for pavement engineering.
Zhenjun Wang; Chuang Xu; Sheng Wang; Jie Gao; Tao Ai. Utilization of magnetite tailings as aggregates in asphalt mixtures. Construction and Building Materials 2016, 114, 392 -399.
AMA StyleZhenjun Wang, Chuang Xu, Sheng Wang, Jie Gao, Tao Ai. Utilization of magnetite tailings as aggregates in asphalt mixtures. Construction and Building Materials. 2016; 114 ():392-399.
Chicago/Turabian StyleZhenjun Wang; Chuang Xu; Sheng Wang; Jie Gao; Tao Ai. 2016. "Utilization of magnetite tailings as aggregates in asphalt mixtures." Construction and Building Materials 114, no. : 392-399.
Ir(TFA)3 (TFA=1,1,1-trifluoro-2,4-pentanedionate) metal complexes with high purity was successfully synthesized. The metal complexes have been characterized by elemental analysis, infrared spectroscopy, nuclear magnetic resonance spectroscopy. The volatility of metal complexes was studied by thermogravimetry analysis. And a possible decomposition mechanism was studied by mass spectroscopic analysis method. The novel iridium complexes can be severed as precursor in metalorganic chemical vapor deposition of iridium films. iridium films were deposited by metalorganic chemical vapor deposition method, and the Ir(TFA)3 complex was used as precursor. The iridium thin films were characterized by X-ray diffraction and scanning electron microscopy in order to determine crystallinity and surface morphology.
Xin Yan; Tao Ai; Xinhua Su; Zhenjun Wang; Guodong Sun; Peng Zhao. Synthesis and Thermal Decomposition Mechanism Study of a Novel Iridium Precursor. MATEC Web of Conferences 2016, 43, 1002 .
AMA StyleXin Yan, Tao Ai, Xinhua Su, Zhenjun Wang, Guodong Sun, Peng Zhao. Synthesis and Thermal Decomposition Mechanism Study of a Novel Iridium Precursor. MATEC Web of Conferences. 2016; 43 ():1002.
Chicago/Turabian StyleXin Yan; Tao Ai; Xinhua Su; Zhenjun Wang; Guodong Sun; Peng Zhao. 2016. "Synthesis and Thermal Decomposition Mechanism Study of a Novel Iridium Precursor." MATEC Web of Conferences 43, no. : 1002.
An experimental investigation was carried out to study the influence of graft treatment for Kevlar stitch threads on the interlaminar properties of stitched unidirectional laminates. The surfaces of Kevlar stitch threads were immersed in a solution of Dimethyl sulfoxide mixed with NaH for some time, and then alkoxysilane was grafted onto the surface of modified Kevlar threads. The corresponding physical and chemical changes in the surface of Kevlar threads were carefully evaluated using XPS, SEM, water absorption, and tensile measurement. Results show that the treated Kevlar threads have much rougher surface morphologies, its tensile strength is slightly improved, and their wettability are greatly improved. The stitched carbon /epoxy composite using surface-treated Kevlar threads has excellent hydrothermal property. The resins can better wet the surface treatment of Kevlar stitch threads, and the sizes of rich resin can be reduced. The moisture uptake of stitched composites decreases by 53.3% and its residue ratio of interlaminar shear strength in a wet state improves by 13.1%.
Ai Tao; Rumin Wang; Zhenjun Wang; Peng Zhao; Xin Yan. The influence of surface treatment of stitch threads and stitching on interlaminar properties of unidirectional laminates. Composite Interfaces 2016, 23, 1 -10.
AMA StyleAi Tao, Rumin Wang, Zhenjun Wang, Peng Zhao, Xin Yan. The influence of surface treatment of stitch threads and stitching on interlaminar properties of unidirectional laminates. Composite Interfaces. 2016; 23 (4):1-10.
Chicago/Turabian StyleAi Tao; Rumin Wang; Zhenjun Wang; Peng Zhao; Xin Yan. 2016. "The influence of surface treatment of stitch threads and stitching on interlaminar properties of unidirectional laminates." Composite Interfaces 23, no. 4: 1-10.
Microwave heating technology has been adopted in asphalt pavement maintenance to reduce the total cost resulting from the energy consumption. In this paper, laboratory preparation and microwave heating tests of carbonyl iron powders (CIPs)/asphalt binder were carried out. The modeling procedure, microwave heating efficiency and the properties of the CIPs/asphalt binder - such as penetration, softening point and ductility - were studied. The results show that microwave heating efficiency of CIPs/asphalt binder is enormously higher than that of ordinary asphalt binder. Adding a certain amount of CIPs can improve the asphalt binder's resistance to deformation at high temperature. All of these can put forward a theoretical basis to design asphalt mixtures suitable for use in snow and ice removal by microwave pavement maintenance vehicles.
Zhenjun Wang; Sheng Wang; Tao Ai; Peng Zhao. Laboratory Preparation and Microwave Heating Test of CIPs/Asphalt Binder. Ground Improvement and Geosynthetics 2014, 1 .
AMA StyleZhenjun Wang, Sheng Wang, Tao Ai, Peng Zhao. Laboratory Preparation and Microwave Heating Test of CIPs/Asphalt Binder. Ground Improvement and Geosynthetics. 2014; ():1.
Chicago/Turabian StyleZhenjun Wang; Sheng Wang; Tao Ai; Peng Zhao. 2014. "Laboratory Preparation and Microwave Heating Test of CIPs/Asphalt Binder." Ground Improvement and Geosynthetics , no. : 1.
Traffic accidents occur frequently during snowfall and freezing rain in winter. Therefore, it is desirable that snow and ice be removed effectively and rapidly without using chemical salt or mechanical devices. In this paper, the influences of carbon fiber with different contents on mechanical properties, microwave reflectivity, and microwave deicing time of micro surfacing asphalt mixtures were investigated. The results indicate the percentage of carbon fiber has significant influences on the mechanical properties of the mixtures. The flexural strength of the mixtures with 0.75 % carbon fiber was 1.5 times and the compressive strength with 0.45 % was 1.3 times higher than those of the mixtures without carbon fiber. At the percentage of 0.45, the minimum reflectivity was reached as –13.5 dB in the frequency range of 2.3–2.6 GHz. The carbon fiber addition can evidently enhance the ability of the mixtures to absorb the microwave. The deicing time keeps decreasing as the carbon fiber percentage increases from 0.15 % until 0.45 %; then increases gradually and rises sharply until 0.75 %. The minimum deicing time reaches 55 s for the mixtures with 0.45 % carbon fiber. The lower the microwave reflectivity is, the shorter the deicing time. The thickness of ice is also found to be an important factor affecting the deicing time of the mixtures. The mixtures with around 15 mm thick ice obtain the shortest deicing time.
Zhenjun Wang; Jie Gao; Tao Ai; Peng Zhao. Laboratory Investigation on Microwave Deicing Function of Micro Surfacing Asphalt Mixtures Reinforced by Carbon Fiber. Journal of Testing and Evaluation 2014, 42, 1 .
AMA StyleZhenjun Wang, Jie Gao, Tao Ai, Peng Zhao. Laboratory Investigation on Microwave Deicing Function of Micro Surfacing Asphalt Mixtures Reinforced by Carbon Fiber. Journal of Testing and Evaluation. 2014; 42 (2):1.
Chicago/Turabian StyleZhenjun Wang; Jie Gao; Tao Ai; Peng Zhao. 2014. "Laboratory Investigation on Microwave Deicing Function of Micro Surfacing Asphalt Mixtures Reinforced by Carbon Fiber." Journal of Testing and Evaluation 42, no. 2: 1.