Hydration of Portland Cement Compounds

Rogue, R. H.; Lerch, William

doi:10.1021/ie50296a007

Cited by 55 publications

(30 citation statements)

References 7 publications

(10 reference statements)

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“…Bogue and Lerch [2], in a study of the alkali-free lime silicates, came to the conclusion, from results of free-lime determinations, that the hydrated products had compositions approaching a value of 2CaO: Si02 :xH20. This result is in accord with that obtained in studies of the system line-silica-water reported by Flint and Wells [3] and Bessey [4].…”

Section: Applications Of the Results Of The Study To Concretementioning

confidence: 98%

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Studies of portions of the quaternary system soda-lime-silica-water at 25 degrees C

Kalousek¹

1944

J. RES. NATL. BUR. STAN.

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A study has been made of portions of the system soda-lime-silica-water at 25° C. The only solid phases found were Ca(OH)2 and a four-component gel of variable composition. The boundary, Ca(OHh-soda-lime-silicate gels, was determined and the compositions of the gels along this boundary shown to vary from 0.003Na20:2.OCaO: 1.0Si02 :xH20 (at 0.2 g of Na20 per liter) to about 0.25Na20:-1.0CaO: 1.0Si02 :xH20 (at 20 g per liter and extending to 101 g per liter of Na20). In regions off the boundary, at selected constant concentrations of Na20 but with increasing concentrations of Si02 in solution, the Na20:Si02 molar ratio of the gels varied only slightly from 0.2 in most cases; the CaO: Si02 molar ratio, however, decreased to values approaching 0.1 at the maximum concentrations of Si02 used. Interpretations pertaining to relations between the composition of the gels and solutions are given.

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Section: Applications Of the Results Of The Study To Concretementioning

confidence: 98%

“…In order to show the relation between the compositions of the gels and solutions along the boundary, the data for mixtures 5, 10, 19, 27, 32, and 37 in table 2 were computed as mole percent of N fizO, CaO, and Si02, the water being disregarded. These results are plotted in figure 4.…”

Section: (B) Relation Between Compositions Of Gels and Solutions Alonmentioning

confidence: 99%

Studies of portions of the quaternary system soda-lime-silica-water at 25 degrees C

Kalousek¹

1944

J. RES. NATL. BUR. STAN.

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“…In ucts of C4AF formed under different conditions. Portland cement the ferrite phase may have a vari-It is contended that of all cement mineral pastes able composition that can be expressed as the C4AF paste yields lowest strength [2], but it C2(AnF1 -,) where 0 < n < 0.7.…”

Section: Introductionmentioning

confidence: 99%

Significance of water/solid ratio and temperature on the physico-mechanical characteristics of hydrating 4CaO.Al2O3.Fe2O3

Ramachandran

Beaudoin

1976

J Mater Sci

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1007/BF00708268Journal of Materials Science, 11, 10, pp. 1893Science, 11, 10, pp. -1910Science, 11, 10, pp. , 1976 Significance of water-solic ratio and temperature on the physicomechanical characteristics of hydrating 4CaO.A12O3. Fe2O3 Ramachandran, V. S.; Beaudoin, J. J. Tetracalcium alumino-ferrite in paste form, at waterlsolid (WIS) ratios of 0.3,0.4,0.5 and 1 .O, and in pressed form at effective waterlsolid ratios of 0.13 and 0.08 has been hydrated for up to 45 days at temperatures of 23 and 80" C. Some prehydrated samples have also been subjected to autoclave treatment at 21 6" C. Of all the samples studied, that hydrated at a WIS = 0.1 3 at 80" C indicated the highest ratio of cubic phase to hexagonal phase; that hydrated at a WIS = 0.08 at 23" C showed the lowest. Thermograms gave evidence of the formation of hexagonal phases, although X-ray diffraction patterns did not. The specific surface area values depended on the degree of hydration and the nature of the product, autoclaved samples giving the lowest values. During the four days of hydration the specimen hydrated at 80" C expanded more than that hydrated at 23" C, but after that time the rates of expansion were reversed: that of the sample hydrated at 80" C was much lower than that of the sample hydrated at 23" C. Microstructural examination of the material formed at higher temperatures and lower waterlsolid ratios indicated a closely welded, continuous network of cubic phase. Such a structure yields a product of higher strength than that of a loose structure formed at higher waterlsolid ratios. A reasonably linear relation was found between porosity and logarithm of microhardness.

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“…All specimens were cured over 28 days, which is acknowledged as not being the exact time required to reach perfect equilibrium; however, this assumption was made because a 28-day curing period has been commonly used as the standard to reach equilibrium in hydration kinetics [49]. The final concentration of free chloride in the cement paste was determined by following ASTM C 1218 [50]; therefore, pulverized samples were crushed from the cement paste by using the dry-grinding technique and measured for water-soluble chloride using a chloride meter for concrete provided by DAE YOUNG WIRE Co., LTD.…”

Section: Equilibriummentioning

confidence: 99%

Chloride adsorption by calcined layered double hydroxides in hardened Portland cement paste

Yoon

Moon

Bae

et al. 2014

Materials Chemistry and Physics

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h i g h l i g h t sWe examine the adsorption equilibrium and kinetics of CLDH in the hydrated cement. CLDH capacity to bind chloride ions in the hydrated cement paste is determined. We model chloride adsorption by CLDH through the cement matrix. CLDH reforms the layered structure with ion adsorption in the cement matrix. s t r a c tThis study investigated the feasibility of using calcined layered double hydroxides (CLDHs) to prevent chloride-induced deterioration in reinforced concrete. CLDHs not only adsorbed chloride ions in aqueous solution with a memory effect but also had a much higher binding capacity than the original layered double hydroxides (LDHs) in the cement matrix. We investigated this adsorption in hardened cement paste in batch cultures to determine adsorption isotherms. The measured and theoretical binding capacities (153 mg g À1 and 257 mg g À1 , respectively) of the CLDHs were comparable to the theoretical capacity of Friedel's salt (2 mol mol À1 or 121 mg g À1 ), which belongs to the LDH family among cementitious phases. We simulated chloride adsorption by CLDHs through the cement matrix using the Fickian model and compared the simulation result to the X-ray fluorescence (XRF) chlorine map. Based on our results, it is proposed that the adsorption process is governed by the chloride transport through the cement matrix; this process differs from that in an aqueous solution. X-ray diffraction (XRD) analysis showed that the CLDH rebuilds the layered structure in a cementitious environment, thereby demonstrating the feasibility of applying CLDHs to the cement and concrete industries.Crown

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Hydration of Portland Cement Compounds

Cited by 55 publications

References 7 publications

Studies of portions of the quaternary system soda-lime-silica-water at 25 degrees C

Studies of portions of the quaternary system soda-lime-silica-water at 25 degrees C

Significance of water/solid ratio and temperature on the physico-mechanical characteristics of hydrating 4CaO.Al2O3.Fe2O3

Chloride adsorption by calcined layered double hydroxides in hardened Portland cement paste

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