Zastosowanie spektroskopii w podczerwieni w badaniach nad syntezą thaumazytu w temperaturze pokojowej i w temperaturze 7°C

Ghorab, H. Y.; Mabrouk, M. R.; Herfort, D.; Osman, Y. A.

Artykuł - szczegóły

Tytuł artykułu

Zastosowanie spektroskopii w podczerwieni w badaniach nad syntezą thaumazytu w temperaturze pokojowej i w temperaturze 7°C

Autorzy

Ghorab H. Y. , Mabrouk M. R. , Herfort D. , Osman Y. A.

Wybrane pełne teksty z tego czasopisma

http://www.cementwapnobeton.pl/

Identyfikatory

Warianty tytułu

Infrared investigation on systems related to the thaumasite formation at room temperature and 7°C

Języki publikacji

PL EN

Abstrakty

Badano zmiany składu fazowego układu o składzie niezbędnym do powstawania thaumasytu w temperaturze pokojowej oraz w 7°C, w oparciu o spektroskopię w podczerwieni. Mieszaniny ciekłego krzemianu sodu [szkła wodnego], ettringitu lub gipsu i węglanu wapnia dojrzewały w wodzie przez 28 dni lub przez trzy miesiące. Śledzono wpływ Ca(OH)2 na przemiany mieszaniny zawierającej ettringit. Otrzymano thaumasyt w temperaturze pokojowej po 9 miesiącach przetrzymywania w roztworze cukrzanu wapnia, zawierającym krzemian sodu, węglan i siarczan wapnia. Otrzymano typowe widma krzemu w koordynacji oktaedrycznej tylko w obecności ettringitu, po 28 dniach przechowywania w temperaturze pokojowej. Wyniki wykazują, że wodorotlenek wapnia przyczynia się do powstawania wiązań wapnia z oktaedrami krzemo-tlenowymi w przypadku zwiększonej rozpuszczalności wapnia w niskiej temperaturze lub w roztworze sacharozy. Dojrzewanie w 7°C powoduje wyostrzenie widma w podczerwieni w zakresie liczby falowej ≤1100 cm-1, typowego dla pasma krzemianu.

Pure systems with compositions needed for thaumasite formation at room temperature and 7°C were investigated by means of FTIR. Mixes of liquid sodium silicate, ettringite/or gypsum and calcium carbonate were stored in water for 28 days and 3 months. The effect of portlandite on the behavior of the ettringite-bearing mixture was investigated. Thaumasite was obtained at room temperature after 9 months storage of a lime sucrose solution with sodium silicate, carbonate and sulfate. Characteristic spectra of the octahedral silicon were detected only in presence of ettringite after 28 days storage at room temperature. The results indicate that the role of portlandite is to bond calcium with silicon octahedral at an increased solubility of lime at low temperature or in sucrose solution. Storage at 7°C lead to the sharpening of the infrared bands at wave numbers ≤1100 cm-1 where the silicate bands were detected.

Słowa kluczowe

taumazyt powstawanie warunki termiczne spektroskopia w podczerwieni FTIR

thaumasite formation temperature conditions IR spectroscopy FTIR

Wydawca

Fundacja Cement, Wapno, Beton

Czasopismo

Cement Wapno Beton

Rocznik

2014

Tom

R. 19/81, nr 4

Strony

252--261

Opis fizyczny

Bibliogr. 51 poz., il.

Twórcy

autor

Ghorab H. Y.

Helwan University, Cairo, Egypt

autor

Mabrouk M. R.

Helwan University, Cairo, Egypt

autor

Herfort D.

Cementir Holding S.p.A

autor

Osman Y. A.

Helwan University, Cairo, Egypt

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Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-7763de59-9988-451a-a79f-8ab36ca14627