ESTIMATION THE 7 AND 28- DAY NORMAL COMPRESSIVE STRENGTH BY ACCELERATED TEST METHODS IN CONCRETE
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Abstract
Curing of concrete is the maintenance of a satisfactory moisture content and temperature for a
period of time immediately following placing so the desired properties are developed. Accelerated
curing is advantages where early strength gain in concrete is important. The expose of concrete
specimens to the accelerated curing conditions which permit the specimens to develop a significant
portion of their ultimate strength within a period of time (1-2 days), depends on the method of the
curing cycle.Three accelerated curing test methods are adopted in this study. These are warm water,
autogenous and proposed test methods. The results of this study has shown good correlation
between the accelerated strength especially for the proposal curing test method and normal strength
using normal curing method at ages 7 and 28 day for the five different chemical composition of
cement with different water to cement ratios equal to 0.45, 0.55, 0.65 and 0.75. Linear and
nonlinear regression analysis show high correlation for the different types of the accelerated curing
methods with coefficient of correlation (R2) more than 0.9.
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References
ACI 517.2R, (1987) revised (1992)," Accelerated curing of concrete at atmospheric pressure –state of the art".
Al Anbori, Z.K.,(2010) , "Factors effecting accelerated strength testing of concrete" PhD. Thesis, University of Baghdad , College of Engineering, Iraq.
Al Qassab, F.F.,(2006) , "Development of concrete mix design method with reference to Iraqi conditions" PhD. Thesis, University of Baghdad , College of Engineering, Iraq.
Al Rawi, R.S., (1974), "The effect of composition and fineness of cement in accelerated testing of concrete", ASTM,
Journal of Testing and Evaluation, Vol.2, No.2, pp.102-106.
ASTM C684 -99: Standard test method for making accelerated curing, testing.
ASTM C 143/C 143M – 00: Standard test method for slump of hydraulic-cement concrete.
BS 1881: Part 112: 1983: Methods of accelerated curing of test cubes.
BS 1881: Part 116: 1983: Methods for determination of compressive strength of concrete cubes.
IQS 5-1984: Iraq standard specification for Portland cement.
IQS 7-1981: Standard methods for chemical analysis of Portland cement.
IQS 8-1989: Standard method for physical test of Portland cement.
IQS 33-1989: Sulfate content for fine and coarse aggregate.
IQS 45-1984: Aggregate from natural sources for concrete and building construction.
IQS 1703/1992: Water used in concrete. Kosmatka and Panarese (1994),"Design and control of concrete mixtures", 13th e.d., Portland cement Association.
Lewis, R.K., (1968),"A summery of investigation of steam curing of concrete related to cement characteristics",
Constructional Review, Vol. 41, No. 3, pp.18-25.
Mamillian, M. Traitement thermique des b'etons, (1982), "presses de L'Ecole
Nationale des Ponts de chausse'es ", in Leb'eton hydraulique, pp 261-269, Paris.
Neville, A.M. (1995), “Properties of concrete”, 4th Edition and final edition, London.