The section contains articles of back issues of Materials Science-Poland. Interaction of Pb with hydrating alite paste XPS studies of surface products

• Autorzy: Nocuń-Wczelik W. , Nocuń M. , Łój G.
• Języki publikacji: PL

Abstrakty

EN

A study into the effect of Pb-bearing compounds on hydration of cement has been carried out, using simplified cement models, including models for alite and gypsum. The kinetics of hydration of these compounds was evaluated by the calorimetry method. The microstructure has been characterized, and X-ray photoelectron spectroscopy was used to analyze thin layers of products formed on the surface of hydrating grains. Depending on the composition of the initial mixture and Pb-bearing compounds various effects were observed. When pure PbO was used as the additive, the reaction of alite with water was significantly accelerated but when the additive consisted of a mixture of PbO and gypsum, the alite/water reaction was retarded, as in the case of cement. As was found by the XPS studies, a part of Pb2+ ions enters the reaction with sulfate ions and the barrier of PbSO4 which is poorly soluble is thus formed. Furthermore, lead introduced to the hydrated alite suspension is strongly bound by C-S-H, as can be derived from high binding energies of core electrons on Pb 4f orbitals. PbSO4.

Słowa kluczowe

EN

alite; calorimetry; hydration; lead; XPS

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2009
• Tom: Vol. 27, No. 4/1
• Strony: 933--945
• Opis fizyczny: Bibliogr. 13 poz.

Twórcy

autor

Nocuń-Wczelik W.

autor

Nocuń M.

autor

Łój G.

• University of Science and Technology AGHFaculty of Materials Science and Ceramics Al. Mickiewicza 30 30-059 Cracow, Poland

Bibliografia

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