Heat of hydration of portland cement pastes

Lerch, William; Bogue, R. H.

doi:10.6028/jres.012.057

Cited by 55 publications

(18 citation statements)

References 4 publications

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“…The heats of solution of the several compounds are given in table 3. The heats of solution, obtained in this manner, of some of these compounds are different from values given in a previous report [17], which is due to the use of different solvents. x-Indicate platinum lines.…”

Section: Latent Heat Of Crystallization Of the Liquid Phasecontrasting

confidence: 89%

Method for approximating the glass content of portland cement clinker

Lerch¹,

Brownmiller²

1937

J. RES. NATL. BUR. STAN.

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This report describes a method for approximating the glass content of portland cement clinker. The method involves a determination of the heat of solution of the original clinker and of the same clinker which has subsequently been annealed under conditions designed to produce complete crystallization. The difference between the heat values so obtained is due principally to the latent heat of crystallization of the glass present in the original clinker. The ratio between that value and the latent heat of crystallization of the glass phase represents the glass content of the clinker. A curve is given showing the latent heat of crystallization of all possible glass compositions obtainable from melts at 1,400° C in the system CaO-AI20.Si02-Fe20g between the A120g/Fe203 ratios of 0.64 and 3.24.

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Section: Latent Heat Of Crystallization Of the Liquid Phasecontrasting

confidence: 89%

Method for approximating the glass content of portland cement clinker

Lerch¹,

Brownmiller²

1937

J. RES. NATL. BUR. STAN.

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“…Determinations of the contributions of mdividual compounds to the properties of cements and concretes [2,3] have been based on the assumptions of previous investigators that the cement clinker is completely crystalline and that no more than six phases-3CaO.SiOz, 2CaO .Si02, 3CaO.Al20 a, 4CaO.AlzOa. FezOa, free CaO, and free MgO (periclase)-are present.…”

Section: Introductionmentioning

confidence: 99%

Relation of compositions and heats of solution of portland cement clinker

Insley¹,

Flint²,

Newman³

et al. 1938

J. RES. NATL. BUR. STAN.

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The results of chemical and microscopic analyses and heat-of-solution measurements on samples of commercial portland cement clinker are reported. Differences between quantitative microscopic analysis and compound composition calculated fr om chemical analysis have systematic relationships with chemical composition of the clinker. The heats of solution calculated from compound composition by microscopic and by chemical analysis show fair correspondence with the observed heats of solution. Assumptions on which both methods of calculation are based are shown to be somewhat faulty.

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“…(4) 2C 3 A + 21H H 2C 3 AH 6 + 9H hydrogarnet ΔΗ = 210 cal/g C 3 A (ref. 20) The fact that eq. (5) liberates less heat than eq.…”

Section: Cao + H 2 0 + Ca(0h) 2 δη = 278 Cal/gcao (3)mentioning

confidence: 99%