Results 211 to 220 of about 33,500 (261)

Immobilization of Ca2+ by OH- ions on calcium silicate hydrates

Casar Z, Mismetti L, Harris M, Greenwell H, Scrivener K, Předota M, Bowen P.   +6 more
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Use of extractants in the synthesis of calcium silicates and calcium silicate-based materials

Theoretical Foundations of Chemical Engineering, 2011
During hydrothermal synthesis of calcium hydrosilicates from phosphogypsum and silica gel, the addition of quaternary ammonium bases during the crystallization step makes it possible to decrease the particle size and preserve the high disparity of calcium silicate product (wollastonite) after high-temperature annealing (from 900 to 1200°C).
L. V. Akat’eva, V. D. Gladun, A. I. Khol’kin   +2 more
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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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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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Calcium hydroxide distribution and calcium silicate hydrate composition in tricalcium silicate and β-dicalcium silicate pastes

Cement and Concrete Research, 1984
Abstract Pastes of tricalcium silicate (C3S) and β-dicalcium silicate (C2S) 23 years old were studied by electron probe microanalysis. In both cases, regions consisting entirely or largely of calcium hydroxide and of CSH were distinguished on a scale of 2–50 μm. The regions high in CSH accounted for 75–80 percent of the whole in the C3S paste and
H.F.W. Taylor, D.E. Newbury
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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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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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The Osteoinductivity of Silicate-Substituted Calcium Phosphate

Journal of Bone and Joint Surgery, 2011
The osteoinductivity of silicate-substituted calcium phosphate and stoichiometric calcium phosphate was investigated with use of ectopic implantation. Implants with a macroporosity of 80% and a strut porosity of 30% were inserted into sites located in the left and right paraspinal muscles of six female sheep.After twelve weeks in vivo, a longitudinal ...
Melanie J, Coathup, Sorousheh, Samizadeh, Yvette S, Fang, Thomas, Buckland, Karin A, Hing, Gordon W, Blunn   +5 more
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Aggregation of Calcium Silicate Hydrate Nanoplatelets

Langmuir, 2016
We study the aggregation of calcium silicate hydrate nanoplatelets on a surface by means of Monte Carlo and molecular dynamics simulations at thermodynamic equilibrium. Calcium silicate hydrate (C-S-H) is the main component formed in cement and is responsible for the strength of the material.
Delhorme, Maxime, Labbez, Christophe, Turesson, Martin, Lesniewska, Eric, Woodward, Cliff, Jönsson, Bo   +5 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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