Advances in understanding hydration of Portland cement

https://www.tpbin.com/Uploads/Subjects/02e8c8b6-1af1-432c-b5cf-1b15ff97d677.pdf

The kinetic analysis of the pyrolysis of agricultural residue under non-isothermal conditions.

The thermal behavior of kaolinite intercalation complexes-A review

The kaolinite intercalation and its application in polymer-based functional composites have attracted great interest, both in industry and in academia fields, since they frequently exhibit remarkable improvements in materials properties compared with the virgin polymer or conventional micro and macro-composites. Also of significant interest regarding the kaolinite intercalation complex is its thermal behavior and decomposition. This is because heating treatment of intercalated kaolinite is necessary for its further application, especially in the field of plastic and rubber industry. Although intercalation of kaolinite is an old and ongoing research topic, there is a limited knowledge available on kaolinite intercalation with different reagents, the mechanism of intercalation complex formation as well as on thermal behavior and phase transition. This review attempts to summarize the most recent achievements in the thermal behavior study of kaolinite intercalation complexes obtained with the most common reagents including potassium acetate, formamide, dimethyl sulfoxide, hydrazine and urea. At the end of this paper, the further work on kaolinite intercalation complex was also proposed.

The thermal behavior of kaolinite intercalation complexes : a review

The thermally induced transformation of kaolinite to metakaolin is simulated using molecular dynamics through a step-wise dehydroxylation approach. The simulation shows that the removal of structural water through dehydroxylation produces a distortion or buckling effect in the 1 : 1 Al–Si layers, which is due to the migration of the aluminium into vacant sites provided by the inter-layer spacing. The structural change is characterized by a loss of crystallinity and a concomitant change in aluminium coordination from octahedral to tetrahedral, with this study confirming the presence of 5-fold aluminium within the metakaolin structure. The degree and probability of Al migration are proportional to the amount of local disorder within the structure, which is governed by the degree of local hydroxyl group loss. This results in the formation of aluminium clusters within the layers. This study proposes that instead of a uniform structure, metakaolin exhibits regions of differing aluminium concentrations, which can have major effects in the reaction chemistry at those sites.

/pdf/dehydroxylation-of-kaolinite-to-metakaolin-a-molecular-4hvvphnc1x.pdf

Jiří Brandštetr

Papers

The kinetic analysis of the thermal decomposition of kaolinite by DTG technique

Isothermal kinetic analysis of the thermal decomposition of kaolinite: The thermogravimetric study

The non-isothermal kinetic analysis of the thermal decomposition of kaolinite by thermogravimetric analysis

The kinetics of Al-Si spinel phase crystallization from calcined kaolin

The kinetics and mechanism of kaolin powder sintering I. The dilatometric CRH study of sinter-crystallization of mullite and cristobalite