Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Reversible decrease of the flexural dynamic modulus of cement pastes upon heating
Due to the high temperatures encountered by concrete structures in hot regions, in addition to the heat associated with a fire, the effect of heating on the properties of concrete is of interest. The degradation upon heating can be in the form of weight loss (due to spalling and moisture loss), porosity increase and decreases in strength and modulus. The flexural storage modulus was found to decrease gradually and reversibly with increasing temperature from 30 deg C to 150 deg C for cement pastes. Among the admixtures used (latex, methylcellulose and silica fume), silica fume (15 % by weight of cement) gave the highest flexural storage modulus at all temperatures (30 deg C to 150 deg C), but also the greatest fractional decrease in modulus upon heating. Methylcellulose (0.4 % by weight of cement) gave higher modulus than latex (20 % to 30 % by weight of cement). The modulus increased with increasing latex/cement ratio. Cement paste without admixture gave the lowest modulus.
Reversible decrease of the flexural dynamic modulus of cement pastes upon heating
Due to the high temperatures encountered by concrete structures in hot regions, in addition to the heat associated with a fire, the effect of heating on the properties of concrete is of interest. The degradation upon heating can be in the form of weight loss (due to spalling and moisture loss), porosity increase and decreases in strength and modulus. The flexural storage modulus was found to decrease gradually and reversibly with increasing temperature from 30 deg C to 150 deg C for cement pastes. Among the admixtures used (latex, methylcellulose and silica fume), silica fume (15 % by weight of cement) gave the highest flexural storage modulus at all temperatures (30 deg C to 150 deg C), but also the greatest fractional decrease in modulus upon heating. Methylcellulose (0.4 % by weight of cement) gave higher modulus than latex (20 % to 30 % by weight of cement). The modulus increased with increasing latex/cement ratio. Cement paste without admixture gave the lowest modulus.
Reversible decrease of the flexural dynamic modulus of cement pastes upon heating
Reversible Verringerung der dynamischen Biegebeanspruchungseigenschaften von Zementpasten unter Temperatureinfluß
Fu, X. (Autor:in) / Chung, D.D.L. (Autor:in)
Cement and Concrete Research ; 27 ; 839-844
1997
6 Seiten, 4 Bilder, 1 Tabelle, 13 Quellen
Aufsatz (Zeitschrift)
Englisch
Reversible Decrease of the Flexural Dynamic Modulus of Cement Pastes upon Heating
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