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Zhou S.,East China Jiaotong University | Zhou S.,State Key Laboratory of Green Building Materials | Huang S.,East China Jiaotong University
Disaster Advances | Year: 2010

This paper presents an experimental investigation on the effect of two kinds of activated coal gangue powder on compressive strength, porosity and pore size distribution of hardened cement mortars. Two kinds of activated coal gangue powder, a simple thermal activated coal gangue powder (OCG) and a doubly activated coal gangue powder (GCG), which was grinded in mill after calcinations, were used to partially replace Portland cement at 0%, 10%, 30% by weight. The water to binder ratio (w/b) of 0.5 was used for all the blended cement mortar mixes.Test results indicated that the blended cement mortars with doubly activated coal gangue powder produced higher compressive strength than that with simple thermal activated coal gangue powder. Hie porosity and pore size distribution of blended cement mortar was significantly affected by the replacement of activated coal gangue powder.


Ma Z.,China Academy of Building Research | Ma Z.,State Key Laboratory of Green Building Materials | Wang L.,China Academy of Building Research | Wang L.,State Key Laboratory of Green Building Materials | Ma J.,University of Jinan
Materials Science Forum | Year: 2013

Accelerators have taken an important role in preparation of shotcrete. The preparation method of a new chlorine-free and alkali-free liquid accelerator was amplified, and its effects on cement setting time, mortar strength and other performances were studied. The results showed that the preparation accelerator was transparent liquid, alkali-free, chlorine-free, stabilization, and long time not to layer. When the addition ratio (in mass) of accelerator is more than 4%, such performances like setting time and mortar strength of cement reach the requirement of JC477-2005 standard. The 1d compressive strength of cement mortar was up to 14Mpa, and 28d compressive strength doe not decrease. The best addition ratio of this accelerator is 4% to 6%. © (2013) Trans Tech Publications, Switzerland.


Yu G.,China Academy of Building Research | Yu G.,State Key Laboratory of Green Building Materials | Wang H.,China Academy of Building Research | Wang H.,State Key Laboratory of Green Building Materials
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2016

For the requirement of off-line Low-E coating design and process of refractive index and thickness of transparent dielectric layer control, the method and the process of using genetic algorithm were proposed according to the on-line reflection spectra of the film surface and the Cauchy optical model. The on-line spectral measurement device was installed on the export side of the coating equipment, the width of the coated glass was measured at 24 points, and the wavelength range of each point was 380~780 nm, the time required for each measuring point was less than 260 ms. The characteristics of the Cauchy optical model and the dielectric film in the Low-E film system were discussed based on the principle of genetic algorithm to establish the analysis process of film refractive index and thickness, and the influence of the main parameters of genetic algorithms was discussed. The optimum genetic optimum condition is population size of 35 individuals, 40 iterations, the elite count of 8, and crossover fraction of 0.2. The reasonable initial value was established according to the reflectance spectrum characteristics of film surface for the more appropriate analysis of the results. © 2016, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.


Ma Z.,China Academy of Building Research | Ma Z.,State Key Laboratory of Green Building Materials | Wang L.,China Academy of Building Research | Wang L.,State Key Laboratory of Green Building Materials
Procedia Engineering | Year: 2012

The status of carbon dioxide emission, separation and application from cement kiln were reviewed. The molecule structure of carbon dioxide, the thermodynamics feasibility of fixation of carbon dioxide into polymer was also analyzed. Fixation technologies and the development of catalysts for the fixation of carbon dioxide into polymer were reviewed in detail. The outlook of the catalyst was suggested. © 2011 Published by Elsevier Ltd.


Tang Z.,Beijing University of Technology | Tang Z.,State Key Laboratory of Green Building Materials | Tang Z.,State Key Laboratory of Millimeter Waves | Wang Q.,Beijing University of Technology | And 3 more authors.
IEICE Electronics Express | Year: 2015

In this paper, the absorbing effectiveness of spherical particle absorber made of cheap Fe-rich hollow cenosphere fly-ash is analyzed. The effects of the diameter of spheres, the number of layer and the stack modes of sphere particle on the absorbing effectiveness were explored. Based on the results, a three-layer structure with mixed sizes of spheres was designed, constructed and tested. Obtained results show that this structure has a maximal reflection loss of 9 dB and the bandwidth being higher than 5 dB is more than 17 GHz. When applying the permittivity of Fe-rich hollow cenosphere fly-ash, and the thickness of absorber is 6.5 cm, the maximal reflection loss is 23 dB and the bandwidth being lower than −10 dB is more than 14 GHz, which covers the C, X and Ku bands. The experimental test proved that the three-layer structure absorber has good absorbing effectiveness. © IEICE 2015.

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