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Kinetics of pozzolanic reaction for preparation of flue gas desulfurizer from fly ash and Ca(OH)_(2)

Frontiers of Chemical Science and Engineering 2007年第3期1卷 266-270页

作者： WANG Jingang HU Jinbang WANG Daobin DUAN Zhenya School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China School of Chemical Engineering Hebei University of TechnologyTianjin 300130China

A kinetic model of the pozzolanic reaction for the preparation of flue gas desulfurizers from fly ash and Ca(OH)_(2) was deduced on the basis of solid phase reaction kinetic *** expressions and parameters were obtained and verified by experiment.A comparison of calculated results with experimental results showed that precision in kinetic expressions was *** apparent reaction rate constants of the pozzolanic reaction could be raised by increasing the specific surface area of fly ash and the hydration temperature,and by using a suitable additive.

关键词： fly ash pozzolanic reaction flue gas desulfur-izer kinetics

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pozzolanic reactivity of silico-aluminous fly ash

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Particuology 2008年第2期6卷 93-98页

作者： Pierre Adamiec Jean-Charles Benezet Ali Benhassaine Ecole des Mines d'Alès 6 Avenue de Clavières30319 ALES CedexFrance

For some years it has been possible to control the particle size of fly ashes, by-products of thermal power stations. Incorporating these very fine particles （obtained by grinding and/or pneumatic selection） improves the physical-mechanical characteristics of mortars and concretes. In this study, we measured the lime consumption of the various fractions （granulometric and densimetric） and identified by X-ray diffraction the neoformed phases by the pozzolanic reaction, to show that it is not sufficient to simply define the pozzolanicity of products based on lime consumption since it does not take into account the nature of the phases formed. The size of the particles used in the test samples also has a determining effect on the quantity of lime consumed. Before comparing results, it is necessary to ensure that the size of the particles （of the global ash and its constituents） be the same. Two distinct neoformed ohases appear： CSH in the largest granular fractions （d〉 40 μm） and C3AH6 in the smaller fractions.

关键词： Fly ash pozzolanic reaction Particle size

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Thickening progression mechanism of silica fume-oil well cement composite system at high temperatures

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Petroleum Science 2024年第4期21卷 2793-2805页

作者： Hang Zhang Miao-Miao Hu Peng-Peng Li Guo-Qing Liu Qing-Lu Chang Jie Cao Ming Liu Wen-Hua Xu Xiu-Jian Xia Jin-Tang Guo School of Chemical Engineering and Technology Tianjin UniversityTianjin300350China Zhejiang Institute of Tianjin University Shaoxing312300ZhejiangChina Haihe Laboratory of Sustainable Chemical Transformations Tianjin300192China CNPC Engineering Technology R&D Company Limited Beijing102206China

This work studied the thickening progression mechanism of the silica fume-oil well cement composite system at high temperatures(110-180.C)in order to provide a theoretical guidance for the rational application of silica fume in the cementing *** showed that silica fume seldom affected the thickening progression of oil well cement slurry at 110-120.C,but when temperature reached above130.C,it would aggravate the bulging degree of thickening curves and significantly extend the thickening time,meanwhile causing the abnormal“temperature-based thickening time reversal”and“dosage-based thickening time reversal”phenomena in the range of 130-160.C and 170-180.C *** 130-160.C,the thickening time of oil well cement slurry was mainly associated with the generation rate of calcium hydroxide(CH)*** introduced silica fume would be attracted to the cement minerals'surface that were hydrating to produce CH and agglomerate together to form an“adsorptive barrier”to hinder further hydration of the inner cement ***“adsorptive barrier”effect strengthened with the rising temperature which extended the thickening time and caused the occurrence of the“temperature-based thickening time reversal”*** 170-180.C,the pozzolanic activity of silica fume significantly enhanced and considerable amount of C-S-H was generated,thus the“temperature-based thickening time reversal”vanished and the“dosage-based thickening time reversal”was presented.

关键词： Silica fume Oil well cement Thickening time reversal pozzolanic reaction Adsorptive barrier CH and C-S-H

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Reactivity of Recycled Glass Powder in a Cementitious Medium

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New Journal of Glass and Ceramics 2020年第3期10卷 29-44页

作者： Monique Tohoue Tognonvi Arezki Tagnit-Hamou Léon Koffi Konan Ablam Zidol Wilfried Cyrille N’Cho Department of Biological Sciences University of Peleforo-Gbon-Coulibaly Korhogo C&#244 te d’Ivoire Department of Civil Engineering University of Sherbrooke Quebec Canada Laboratory of Chemistry of Inorganic Materials University of Felix Houphouet-Boigny Abidjan C&#244 te d’Ivoire

The reactivity of the recycled glass powder (GP) in a cementitious medium has been studied over time by means of X-ray diffraction and thermal gravimetric analysis. Two different mixtures based on cement/glass powder (0 or 20 wt% GP) and lime/glass powder (70 wt% GP) were considered. Analysis revealed the coexistence of both hydration and pozzolanic reaction during the hardening of the mortars. At young age, the cement hydration would prevail over the pozzolanic one resulting in a decrease of physico-chemical and mechanical properties of the material due to the dilution effect. The pozzolanic reaction that predominates from 91 days, would induce the formation of supplementary C-S-H leading to improve the material properties.

关键词： Glass Powder pozzolanic reaction Calcium Silicate Hydrate Thermal Analysis X-Ray Diffraction

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