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http://yadda.icm.edu.pl:80/baztech/element/bwmeta1.element.baztech-article-BTB6-0002-0079

Czasopismo

Cement Wapno Beton

Tytuł artykułu

Zarastanie rys w zaprawach cementowych z popiołem wapiennym zbrojonych rozproszonymi włóknami

Autorzy Jóźwiak-Niedźwiedzka, D.  Brandt, A. M.  Ranachowski, Z. 
Treść / Zawartość http://www.cementwapnobeton.pl/
Warianty tytułu
EN Self-healing of cracks in fibre reinforced mortar beams made with high calcium fly ash
Języki publikacji PL
Abstrakty
PL 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.
EN 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
PL zaprawa cementowa   dodatek popiołu wapiennego   zbrojenie rozproszone   samonaprawa   zarastanie rys  
EN 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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