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RISS 인기검색어
- 검색키워드
- 저자 : Xiaoqing Xiong (검색결과 2 건)
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Xiong Wei,Wang Xiaoqing,Li Chunmei 한국콘크리트학회 2024 International Journal of Concrete Structures and M Vol.18 No.4
In order to promote the engineering application of recycled concrete, the effects of PPF and nano-TiO2 dioxide on the mechanical properties and durability of recycled concrete were studied. Polypropylene fiber recycled concrete(PRAC) and nano-TiO2 recycled concrete(TRAC) were prepared by adding different volume contents of PPF and nano-TiO2. The experimental findings demonstrated that the PPF and nano-TiO2 improved the splitting tensile strength of RAC better than the compressive strength. When the volume content of nano-TiO2. and PPF is 0.8% and 1.0%, respectively, the corresponding splitting tensile strength of concrete reaches the maximum value(3.4 and 3.7 MPa). The contribution rates of nano-TiO2 and PPF with different volume contents to the mechanical properties of RAC have optimal values, which are 0.4 and 1.0%, respectively. The incorporation of nano-TiO2 and PPF can effectively inhibit the loss of RAC mass and the generation of pores under freeze–thaw conditions, and slow down the decrease of dynamic elastic modulus. When the volume content of PPF is 1.0% and the volume content of nano-TiO2 is 0.4%, the protection effect on the internal structure of RAC is better, and its carbon resistance is better. The results of RSM model analysis and prediction show that both PPF and nano-TiO2 can be used as admixture materials to improve the mechanical properties and durability of RAC, and the comprehensive improvement effect of PPF on RAC performance is better than that of nano-TiO2.
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A Novel Natural Dye Derivative for Natural Fabric Supercritical Carbon Dioxide Dyeing Technology
Jinsong Wu,Hongjuan Zhao,Mingyue Wang,Weiru Zhi,Xiaoqing Xiong,Laijiu Zheng 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
The supercritical carbon dioxide (SC-CO2) dyeing technology is a green dyeing technology, and the usage ofnatural dye makes SC-CO2 dyeing technology safer and more environment-friendly. Nevertheless, after using natural dye inSC-CO2 dyeing, the color depth and fastness of dyed natural fabric are poor. In this study, alkyl and hydroxyalkyl groupswere grafted onto alizarin, which is a natural dye, to elevate the color depths and fastness of alizarin-derivative-dyed naturalfabric. The results demonstrate that the color depths of alkyl-alizarin-dyed and hydroxyalkyl-alizarin-dyed natural fabricswere increased. This has to do with the increase in the solubilities of alkyl alizarin and hydroxyalkyl alizarin in SC-CO2. Thehydroxybutyl-alizarin-dyed wool displayed the best color depth (K/S value: 6.44). And the hydroxyalkyl-alizarin-dyednatural fabric showed good washing fastness and rubbing fastness (about 4-5 level), because that hydroxyalkyl alizarin couldbe linked by a covalent bond to the natural fabric.
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