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Controlled Release of Construction Chemicals by Encapsulation

Journal of Encapsulation and Adsorption Sciences 2016年第1期6卷 9-21页

作者： Henning von Daake Thomas Ballweg Dietmar Stephan Building Materials and Construction Chemistry Technische Universitat Berlin Berlin Germany fraunhofer-institute for silicate reasearch isc Würzburg Germany

Encapsulation and controlled release of active agents is a common practice to improve processing and properties of materials and final products in different industries. Today, a large variety of chemical admixtures are used in construction materials, the performance of which could be improved by a better dosage control. This work presents investigations on the controlled release of encapsulated construction chemicals for future applications in construction materials. The high shear mixing technology was used to produce matrix based encapsulations by agglomeration applied to commercially available construction materials. The agglomeration process was varied by the use of different agitator types, the variation of the agitator speed and the application of additional coating materials. The particle size distribution as well as the particle shape of the produced agglomerates was analyzed by automatic image evolution and scanning electron microscopy. The release behavior of the capsules in aqueous solutions was investigated by UV spectroscopy. The obtained results confirmed a theoretical model for the encapsulation and release of admixtures, which was derived from pharmaceutical drug release concepts and adapted to construction materials. The results indicate that the matrix based encapsulation is a promising technique for future applications in the field of construction materials.

关键词： Construction Chemicals Controlled Release Encapsulation High Shear Agglomeration

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Study on activity evaluation of activated coal-gangue and the hydration process

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Journal of Harbin institute of Technology(New Series) 2007年第6期14卷 855-860页

作者：张洪涛邓宏卫冯奇王培铭 HIT University Science Park Co. Ltd. School of Materials Science and Engineering Harbin Institute of Technology School of Municipal and Environmental Engineering Harbin Institute of Technology School of Science and Engineering of Materials Tongji University

Chemical compositions, mineral compositions and the activated mechanism of the coal-gangue were analyzed. And pozzolana activities of the coal-gangue were evaluated after activated. Moreover, hydration heat and hydration compositions of activated coal-gangue-calcium oxide system, as well as hydration degree and hardened paste microstructures of activated coal-gangue-cement system were studied. Results show that pozzolana activities of the activated coal-gangue root in amorphous SiO2 and activated Al2O3. With the exciting of gypsum, the reaction of activated coal-gangue and Ca（OH） 2 would produce hydration products as ettringite, calcium silicate hydrate, and calcium aluminate. The relationship between the curing age and the content of Ca （OH）2 in coal-gangue-cement system was ascertained. Unhydrated particles in the coalogangue-cement paste were more than that in the neat cement paste at the same hydration periods, and even existed at the later stage of hydration. Furthermore, the activated coal-gangue could inhibit growth and gathering of the calcium oxide crystal, and improve the structure of hardened cement paste.

关键词： activated coal-gangue cement pozzolana activity hydration function mechanism

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