000004681 001__ 4681
000004681 005__ 20141119144544.0
000004681 04107 $$aeng
000004681 046__ $$k2002-06-02
000004681 100__ $$aMahdy, M.
000004681 24500 $$aEFFECT OF TRANSIENT HIGH TEMPERATURE ON HEAVYWEIGHT, HIGH STRENGTH CONCRETE

000004681 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference
000004681 260__ $$bColumbia University in the City of New York
000004681 506__ $$arestricted
000004681 520__ $$2eng$$aAs the use of special high strength concrete becomes necessary for special purpose, the risk of exposing it to high temperatures also increases. To be able to predict the response of structures employing special high strength concrete after exposure to high temperature, it is essential that the strength properties of special high strength concrete subjected to high temperatures be clearly understood. In the present work, 12 mixes were selected to achieve a slump above 100 mm and strength up to 140 MPa at 180 days. To achieve this a 0.24 water/cement ratio and 3.5% superplasticiser were used. The investigation used three levels of silicafume (0, 10%, 20% by weight of cement), two coarse aggregate proportions of total aggregate (0.48, 0.65 by volume) and both magnetite and natural sand fine aggregate were used. The effect of transient high temperature on strength of heavy weight high strength concrete was investigated. There were three exposure durations (0, 1hr, 2hrs.) at temperatures of 100, 300, 500 and 700 °C. As the temperature increased to 100 °C, the strength decreased compared to the room temperature strength. With further increase in temperature, the specimens recovered the strength loss and reached a peak strength of 10 to 30 % above the room temperature strength. At the temperature 500 and 700 °C, the strength in each case dropped sharply.

000004681 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004681 653__ $$aheavyweight concrete, high strength concrete; magnetite concrete; heavyweight aggregate; high temperature; elevated temperature; compressive strength.

000004681 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002
000004681 720__ $$aMahdy, M.$$iP.R.S.Speare$$iAbdel-Reheem, A. H.
000004681 8560_ $$ffischerc@itam.cas.cz
000004681 8564_ $$s226803$$uhttps://invenio.itam.cas.cz/record/4681/files/159.pdf$$yOriginal version of the author's contribution as presented on CD, .
000004681 962__ $$r4594
000004681 980__ $$aPAPER