Results 221 to 230 of about 756,097 (272)

Strontium binding by calcium silicate hydrates

Journal of Colloid and Interface Science, 2006
In the present study the binding of strontium with pure calcium silicate hydrates (C-S-H) has been investigated using batch-type experiments. Synthetic C-S-H phases with varying CaO:SiO(2) (C:S) mol ratios, relevant to non-degraded and degraded hardened cement paste, were prepared in the absence of alkalis (Na(I), K(I)) and in an alkali-rich artificial
Tits, J., Wieland, E., Müller, C.J., Landesman, Catherine, Bradbury, M.H.   +4 more
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Hydrated calcium silicates

Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1953
1. Calcium “glycerate” reacts with amorphous silica with formation of dicalcium silicate, readily isolable from the glycerol solution by dilution, when it is obtained in the form of a hydrated silicate of composition 2CaO·SiO2·H2O. 2. The proposed method permits the preparation of dicalcium silicate without the introduction of excess of ...
N. A. Toropov, A. I. Borisenko, P. V. Shirokova   +2 more
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Nanostructure of Calcium Silicate Hydrates in Cements

Physical Review Letters, 2010
Calcium silicate hydrate (CSH) is the major volume phase in the matrix of Portland cement concrete. Total x-ray scattering measurements with synchrotron x rays on synthetic CSH(I) shows nanocrystalline ordering with a particle diameter of 3.5(5) nm, similar to a size-broadened 1.1 nm tobermorite crystal structure.
Skinner, L. B., Chae, S. R., Benmore, C. J., Wenk, H. R., Monteiro, P. J. M.   +4 more
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Pore Structure of Calcium Silicate Hydrate in Hydrated Tricalcium Silicate

Journal of the American Ceramic Society, 1977
Adsorption of N 2 and water vapor was studied in completely hydrated tricalcium silicate and in fully hydrated tricalcium silicate from which Ca(OH) 2 had been extracted. Compared with results obtained using N 2 ,
MASAKI DAIMON, SALAH A. ABO‐EL‐ENEIN, GIRO ROSARA, SEISHI GOTO, RENICHI KONDO   +4 more
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The hydrated calcium silicates

Eos, Transactions American Geophysical Union, 1937
The hydrated‐calcium silicates are of particular geological interest as typical minerals formed by hydrothermal reactions at contact‐zones of different mineral species. They are also of technical significance as compounds which may be formed in the steam‐treatment of Portland cement and pozzolanic materials and in the manufacture of sand‐lime brick. To
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Surface charges on calcium silicates and calcium silicate hydrates

Journal of Colloid and Interface Science, 1968
Calcium ions effect a reversal of the sign of the electrokinetic potential on a- and ß-CaSiO3, a-Ca3Si2O7, ¿-Ca2SiO4, vitreous CaSiO3, xonotlite, and tobermorite in 0.01 N NaOH solution. Points of zero charge range from 1.10-3 to 4.10 M Ca2+. Differences of electrokinetic characteristics between different solids indicate that the surface layers are not
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Magnesium and calcium silicate hydrates

Cement and Concrete Research, 2015
The structure and chemistry of magnesium silicate hydrates (M-S-H) is significantly different from calcium silicate hydrates (C-S-H), although both phases are poorly crystalline and have a variable chemical composition. The molar Ca/Si ratio in synthetic C-S-H varies from approximately 0.7 to 1.5 and the Mg/Si ratio in M-S-H from 0.7 to 1.3.
Lothenbach, B., Nied, D., L'Hôpital, E., Achiedo, G., Dauzères, A.   +4 more
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Carbonation of hydrated calcium silicates

Cement and Concrete Research, 1974
Abstract Mass spectrometric-thermogravimetric analyses have been completed on decomposing calcium silicate hydrates produced in the presence of gaseous CO 2 and CO 3 2− ions. These data clearly show a structured evolution of water during decomposition of the calcium silicate hydrates. The evolution of CO 2 is complex.
J. Norman Maycock, Jan Skalny
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Heteroepitaxial Growth of Calcium Silicate Hydrate on Calcium Germanate Hydrate

Journal of the American Ceramic Society, 1992
The hydration of tricalcium silicate at 25°C was accelerated by seeding with 5 wt% tricalcium germanate. Based on heat evolution, seeding resulted in the elimination of the induction period. However, the shape of the hydration peak remained the same. Because tricalcium germanate hydrates first, the microstructure of the calcium silicate hydrate which ...
Roger I. Martin, Paul W. Brown
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Hydration kinetics of tricalcium silicate with the presence of portlandite and calcium silicate hydrate

Thermochimica Acta, 2019
Abstract This work was designed to investigate the hydration kinetics of C3S with portlandite and calcium silicate hydrate (C-S-H). The hydration heat, T2 relaxation time and XRD of hydration products were determined to evaluate the hydration performance. C-S-H and CH present distinct influence on the early hydration of C3S.
Liming Huang, Zhenghong Yang
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