Yongjia He
Wuhan University of Technology
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Publication
Featured researches published by Yongjia He.
International Conference on the Durability of Concrete Structures | 2014
Linnu Lu; Bing Ping; Yongjia He; Qingjun Ding; Fazhou Wang; Hang Zhu
Thermal storage concrete is prepared by using alkali-activated ground-granulated blast furnace slag as cementitious material. To improve thermal conductivity, graphite aggregate is used to replace part of the coarse aggregate, and, furthermore, polypropylene fiber is added to improve the heat resistance performance of the concrete. The compressive strength of concrete specimens before and after heating (up to 450 °C) was tested, and, furthermore, scanning electron microscopy was used to investigate the structure alteration due to heating. Results showed that the partial replacement of coarse aggregate by graphite block could obviously improve the thermal conductivity of the thermal storage concrete. At the same time, the specimen with 30% graphite aggregate replacement still exhibited good mechanical properties. The mechanism of the high residual strength was investigated.
Journal of Wuhan University of Technology-materials Science Edition | 2014
Linnu Lu; Bing Ping; Yongjia He; Liu He; Xi Wu; Shuguang Hu
The effects of polyacrylamide (PAM) and polyvinyl alcohol (PVA) on morphology and structure of calcium silicate hydrate with C/S 1.0–1.7 prepared via precipitation in solution were investigated by XRD, FT-IR and TEM techniques. The results show that incorporation of the polymers decreased the order degree, increased the interlayer spacing and disturbed the layered stacking of C-S-H. Interlayer spacing expansion depended on C/S ratios and type of polymer. Interlayer spacing expansion had a minimum at C/S 1.0 and a maximum at C/S 1.3 and 1.5. Interlayer spacing expansion of PAM was bigger than that of PVA with the same C/S. C-S-H added with PVA mainly exhibited foil-like and fibrillar morphology. The fibrils were of variable length from a few tens of nanometers to a few hundreds of nanometers. Fibrils or foils seemed to be longer in the presence of PVA.
Journal of Wuhan University of Technology-materials Science Edition | 2013
Yongjia He; Qiang Zhao; Linnu Lu; Shuguang Hu
Porous haydite used as waste filter medium was prepared by dreging lake sludge to help solve the treatment problem of sludge and realize its reclamation. Several calcination regimes were considered and their effects on the pore structure and the properties such as the strength, the density, the filtering ability and the phosphate absorption ability of the haydite were investigated. For the mixture of 60% lake sludge and 40% fly ash in this experiment, the calcination regime with a pre-calcination period at about 600 °C, a temperature keeping period at 1 200 °C and a moderate cooling rate are recommended to prepare haydite with reasonable pore structure and good performances for its usage as the waste water filter media.
Archive | 2008
Shuguang Hu; Qingjun Ding; Yaogang Tian; Xiaolei Wang; Xiulin Huang; Kun Tian; Linnv Lu; Yongjia He; Fazhou Wang; Qing Lin; Zaowen Chen
Journal of Central South University of Technology | 2009
Shuguang Hu; Jing Wu; Wen Yang; Yongjia He; Fa-zhou Wang; Qingjun Ding
Archive | 2009
Shuguang Hu; Qingjun Ding; Yanzhou Peng; Kai Chen; Linnv Lu; Fazhou Wang; Yongjia He
Archive | 2008
Shuguang Hu; Zuguo Liu; Qingjun Ding; Shaolong Huang; Xinquan Liu; Gong Huang; Xuewei Wu; Xiulin Huang; Rongkun Zhang; Fu Jun; Linnv Lv; Fazhou Wang; Yongjia He
Archive | 2008
Shuguang Hu; Qingjun Ding; Xianqi Xie; Liming Deng; Kun Tian; Bo Peng; Hongxi Wang; Yongjia He; Fazhou Wang; Xiulin Huang; Xiaoxia Huang
Archive | 2010
Qing Lin; Linnv Lu; Fazhou Wang; Yong Zhang; Xiaolei Wang; Shuguang Hu; Kun Tian; Xianqi Xie; Xiulin Huang; Shaolong Huang; Yongjia He; Liming Deng; Qingjun Ding
Archive | 2010
Yongjia He; Xinquan Liu; Yang Fang; Linnv Lu; Zaoxin Ao; Xuewei Wu; Shaolong Huang; Shuguang Hu; Fazhou Wang; Qingjun Ding