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Influence of Comb-Polymer Structure on C<sub>3</sub>S Phase Hydration
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作者 Lidia Eusebio Marco Goisis +2 位作者 giuseppe manganelli Valerio Antonio Paternò Paolo Gronchi 《Materials Sciences and Applications》 2013年第12期35-44,共10页
The cement hydration delay is due to comb-polymers (PCP), used as dispersant agent during the preparation of the cement paste. In order to evaluate the role of the PCP structure on hydration, the comb-polymer is separ... The cement hydration delay is due to comb-polymers (PCP), used as dispersant agent during the preparation of the cement paste. In order to evaluate the role of the PCP structure on hydration, the comb-polymer is separated in two main parts: the backbone (PAA) and the dispersing chain. A linear polymer made up of PEO, Mw = 1000, with a carboxylic head suitable to link the inorganic surface, was synthesized to simulate the effect of the dispersing-side chain. The hydration delay of C-S-H formation induced by comb-polymer on CEM I and C3S phase was analyzed by conduction calorimetry and the morphology of the crystalline structure in growth by SEM, specially studying the relation between structure and hydration time. The results show that the hydration delay is mainly ascribable to the comb-shaped structure as a whole, where PEO chain, as from considerations on energy, might assume conformations able to modify the salt concentration near the cement surface. The different hydration rates are tentatively related to the crystal growth and the surface texture observed by SEM. 展开更多
关键词 C3S CEMENT Comb-Polymer HYDRATION Heat Flow
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Impact of photocatalytic remediation of pollutants on urban air quality
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作者 Christian GEORGE Anne BEELDENS +5 位作者 Fotios BARMPAS Jean-Francois DOUSSIN giuseppe manganelli Hartmut HERRMANN Jorg KLEFFMANN Abdelwahid MELLOUKI 《Frontiers of Environmental Science & Engineering》 SCIE EI CAS CSCD 2016年第5期37-47,共11页
In the recent years, photocatalytic self-cleaning and "depolluting" materials have been suggested as a remediation technology mainly for NOx and aromatic VOCs in urban areas. A number of products incorporating the a... In the recent years, photocatalytic self-cleaning and "depolluting" materials have been suggested as a remediation technology mainly for NOx and aromatic VOCs in urban areas. A number of products incorporating the aforementioned technology have been made commercially available with the aim to improve urban air quality. These commercial products are based on the photocatalytic properties of a thin layer of TiO2 at the surface of the material (such as glass, pavement, etc.) or embedded in paints or concrete. The use of TiO2 photocatalysts as an emerging air pollution control technology has been reported in many locations worldwide. However, up to now, the effectiveness measured in situ and theexpected positive impact on air quality of this relatively new technology has only been demonstrated in a limited manner. Assessing and demonstrating the effectiveness of these depolluting techniques in real scale applications aims to create a real added value, in terms of policy making (i.e., implementing air quality strategies) and economics (by providing a demonstration of the actual performance of a new technique). 展开更多
关键词 Photocatalysis Air pollution Depollution efficiency NOx VOC Air quality abatement and management
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