Publikacje

Abstract:

This study covered the issues of concreting in low temperatures. The analysis concerned the effect of gradual cooling of fresh concrete on compressive strength drops after 28 days of maturing. The investigations were conducted for specimens of class C20/25 concrete prepared from cements: CEM I 32.5R, CEM I 42.5R, CEM II/B-V 42.5R and dolomite aggregate. The linear relationship between the concrete volume gain and strength drop was determined.

B I B L I O G R A F I A[1] Jamroży Z., Beton i jego technologie/Concrete and its technologies, PWN, Warszawa 2003 [in Polish].
[2] ITB Guidelines No. 282, Guidelines for construction and assembly works in the period of low temperatures, Warszawa 1995 [in Polish].
[3] Bajorek G., Betonowanie zimą/Winter concreting. Construction, Technology Architecture, Polish Cement, October 2007, No. 4, pp. 48-53 [in Polish].
[4] Jasiczak J., Wpływ okresowego zamrożenia beton, zwykłego i modyfikowanego domieszkami na ich 28-dniową wytrzymałość/Effect of temporary freexing of ordinary and modified concrete on its 28-day strength, XVI Scientific Conference, Jadwisin 1998.
[5] ASTM C 1074, 1998, "Practice for Estimating Concrete Strength by the Maturity Method", 2000 ASTM Standards, Vol. 04.02, ASTM, West Conshohocken, PA.

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Influence of sub-zero temperature and initial set time on the properties of hardened concrete