Zarastanie rys w zaprawach cementowych z popiołem wapiennym zbrojonych rozproszonymi włóknami

Jóźwiak-Niedźwiedzka, D.; Brandt, A. M.; Ranachowski, Z.

Artykuł - szczegóły

Tytuł artykułu

Zarastanie rys w zaprawach cementowych z popiołem wapiennym zbrojonych rozproszonymi włóknami

Autorzy

Jóźwiak-Niedźwiedzka D. , Brandt A. M. , Ranachowski Z.

Wybrane pełne teksty z tego czasopisma

http://www.cementwapnobeton.pl/

Identyfikatory

Warianty tytułu

Self-healing of cracks in fibre reinforced mortar beams made with high calcium fly ash

Języki publikacji

Abstrakty

W przeprowadzonych badaniach wykonano próbki w kształcie beleczek z zaprawy uzbrojonej mikrowłóknami, przy różnym stopniu zastąpienia cementu przez popiół lotny wapienny. Przedstawiono wyniki mikroskopowej charakterystyki popiołu lotnego klasy C ze spalania węgla brunatnego. Analizę mikrostruktury zapraw przeprowadzono w mikroskopie optycznym oraz mikroskopie skaningowym. Badane beleczki były zginane aż do otwarcia rys i mikro rys, które podlegały zarastaniu po różnych okresach pielęgnacji. Uzyskane rezultaty wykazują, że zastąpienie cementu popiołem lotnym wapiennym wpływa na przebieg procesu samozarastania. Dodatek popiołu wapiennego, zarówno 30% jak i 60% przyspiesza proces samorzutnego zarastania rys, a zwłaszcza mikrorys. W badaniach nie stwierdzono przypadku całkowitego wypełnienia rys nowymi fazami, a jedynie udokumentowano początek takiego procesu. Stwierdzono także, że częściowe zastąpienie cementu przez popiół lotny wapienny zmniejsza stosunek S03/Al2O3 w zaprawie, stwarzając tym samym korzystne warunki do powstawania monosiarczanu.

A series of mortar beams was cast with various content of high calcium fly ash as a partial replacement of Portland cement. The results of microstructural characterization of mortar containing fly ash class C (High Calcium Fly Ash) from combustion of lignite are presented. The evaluation ot the microstructure was performed using SEM and optical microscopy. The tested beams were bent till the crack and microcracks opening, which were healed during the different curing time. The results showed that the replacement of cement with fly ash class C influenced the process ot crack healing. The addition ot high calcium fly ash, at both 30% and 60%, speeds up the selt-healing process in cracks and particularly in micro-cracks. In the research the completely filling up of the eracks by new phases has not been observed, only the beginning of such process has been noticed. Additionally, it has been concluded that the partially replacement ot cement by high calcium fly ash decreased the ratio of SO3/Al2O3 in the mortar, owing to the fact that monosulfate could be created.

Słowa kluczowe

zaprawa cementowa dodatek popiołu wapiennego zbrojenie rozproszone samonaprawa zarastanie rys

cement mortar high calcium fly ash addition fibre reinforcement self-healing crack steel fibre dispersed reinforcement

Wydawca

Fundacja Cement, Wapno, Beton

Czasopismo

Cement Wapno Beton

Rocznik

2012

Tom

R. 17/79, nr 1

Strony

38--49

Opis fizyczny

Bibliogr. 30 poz., il.

Twórcy

autor

Jóźwiak-Niedźwiedzka D.

autor

Brandt A. M.

autor

Ranachowski Z.

Instytut Podstawowych Problemów Techniki, Polska Akademia Nauk, Warszawa

Bibliografia

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Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-article-BTB6-0002-0079