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A platform for research: civil engineering, architecture and urbanism
Analiza uszkodzen betonow na mineralnych kruszywach naturalnych i lamanych z wykorzystaniem metod mikroskopii skaningowej
Nucleation and propagation of microdamages in concrete composites were analyzed. The crack nucleation takes place in the aggregate-mortar interfacial transition zone but the damage occurs in cement matrix. Basic characteristics of most frequently used mineral aggregates were described. Their quality was determined by the conditions of their formation, mineral composition of the rocks and external characteristics. Basalt, granite, limestone and gravel concretes were taken into consideration. The maximum size of coarse aggregates used was up to 16 mm. The optimum grain composition was established accorfing to the German DIN 4226-1 standard. The microstructural tests, studies of strength properties and determinations of density, porosity, tightness and absorbability were carried out. Microscopic observations of fracture surfaces of broken specimens were also made. Microstructural tests were performed by the scanning microscopy (magnification 100 to 5000 times). In order to carry out the fracture surface analyses, two electron detectors (secondary and backscattered electrons) were used. The best microstructure was found in the concretes containing limestone aggregates. Only small cracks of local character were visible in interfacial transition zone. The lowest fracture toughness was found for the concrete composite structure obtained using the gravel aggregate. In the composites, the cavities after removed coarse aggregate were visible and the cracks in cement matrix were observed.
Analiza uszkodzen betonow na mineralnych kruszywach naturalnych i lamanych z wykorzystaniem metod mikroskopii skaningowej
Nucleation and propagation of microdamages in concrete composites were analyzed. The crack nucleation takes place in the aggregate-mortar interfacial transition zone but the damage occurs in cement matrix. Basic characteristics of most frequently used mineral aggregates were described. Their quality was determined by the conditions of their formation, mineral composition of the rocks and external characteristics. Basalt, granite, limestone and gravel concretes were taken into consideration. The maximum size of coarse aggregates used was up to 16 mm. The optimum grain composition was established accorfing to the German DIN 4226-1 standard. The microstructural tests, studies of strength properties and determinations of density, porosity, tightness and absorbability were carried out. Microscopic observations of fracture surfaces of broken specimens were also made. Microstructural tests were performed by the scanning microscopy (magnification 100 to 5000 times). In order to carry out the fracture surface analyses, two electron detectors (secondary and backscattered electrons) were used. The best microstructure was found in the concretes containing limestone aggregates. Only small cracks of local character were visible in interfacial transition zone. The lowest fracture toughness was found for the concrete composite structure obtained using the gravel aggregate. In the composites, the cavities after removed coarse aggregate were visible and the cracks in cement matrix were observed.
Analiza uszkodzen betonow na mineralnych kruszywach naturalnych i lamanych z wykorzystaniem metod mikroskopii skaningowej
Scanning microscopy analysis of damages in concretes made of mineral natural and broken aggregates
Golewski, G. (author) / Sadowski, T. (author)
Inzynieria materialowa ; 28 ; 30-35
2007
6 Seiten, 5 Bilder, 4 Tabellen, 42 Quellen
Article (Journal)
Polish
Beton , Betonmörtel , Rissspannung , Schotterstein , Strukturfehler , Druckfestigkeit , Zugfestigkeit , Young-Modul , Mikrostruktur , Elastizitätsmodul , Granit , Basalt , Kalkstein , Kies
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