Research of the Processes of High Temperature Influence on Cementitous Concrete

0392595 - ÚGN 2014 RIV US eng J - Článek v odborném periodiku
Bodnárová, L. - Válek, J. - Sitek, Libor - Foldyna, Josef
Research of the Processes of High Temperature Influence on Cementitous Concrete.
Advanced Science Letters. Roč. 19, č. 2 (2013), s. 500-503. ISSN 1936-6612
Grant CEP: GA ČR GAP104/12/1988
Grant ostatní: GA TA ČR(CZ) TA01010948
Institucionální podpora: RVO:68145535
Klíčová slova: cementitous concrete * high temperature influence * physicalmechanical properties
Kód oboru RIV: JN - Stavebnictví
http://www.ingentaconnect.com/content/asp/asl/2013/00000019/00000002/art00031?token=0052114d07e2a46762c6b635d3e703f252e2e3e5f7a673f7b2f267738703375686f49a0e280f5d6867

The paper focuses on analysis of behaviour of cement composite materials (concrete) exposed to high temperatures. Experimental work was focused on designing and verification of mix-design with higher resistance to action of high temperature. Concrete specimens were exposed to thermal load at the temperatures 200 °C, 400 °C, 600 °C and 900 °C with isothermal dwell 60 minutes. After exposition to high temperature, physicalmechanical properties were tested and compared to reference specimens, which were not exposed to high temperature. Surface of testing specimens was analyzed and percent damage of surface was defined. Concrete mix-designs with components aimed at increasing fire resistance showed the least drop of compressive strength. Concrete with quartz sand and greywacke aggregate with no components enhancing fire resistance showed the most significant changes of compressive strength and appearance. Combination of fibers and basalt aggregate had positive effect compared to using only basalt aggregate.
Trvalý link: http://hdl.handle.net/11104/0221431