Chemistry and Portland cement
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Materials Literature
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Remarks on the calculation of the potential composition of hydraulic cements
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Protection against corrosion in reinforced and prestressed concretes
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Bibliography
Modification of the properties of clays through the use of additives
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Quick hardening of concrete for the purpose of carrying out short time control tests
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Experimental work on the control of rotary Lepol kilns
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CO2 Acceptor Gasification Process
The CO 2 Acceptor Gasification Process is discussed in light of the required properties of the CaO acceptor. Equilibrium data for reactions involving the CO 2 and sulfur acceptance and for sulfur rejection fit the process requirements. The kinetics of the reactions are also sufficiently rapid. Phase equilibrium data i…
AN EVALUATION OF 0.1 M PYROPHOSPHATE AND PYROPHOSPHATE-DITHIONITE IN COMPARISON WITH OXALATE AS EXTRACTANTS OF THE ACCUMULATION PRODUCTS IN PODZOLS AND SOME OTHER SOILS
The 0.1 M Na-pyrophosphate solution extracted some of the Fe-, Al-organic matter products in Podzol B and some Acid Brown Wooded B horizons, but it dissolved a low proportion of the free Fe in the B horizon of some Gleysolic soils. It did not dissolve the inorganic amorphous or crystalline Fe and Al substances tested.…
Etude de la cristallisation des polymères. II. Structure lamellaire et repliement des chaînes du polyoxyéthylène
Abstract Three polyethyleneoxide samples of molecular weights ranging from 6,000 to 28,000 have been studied with low‐angle X‐ray diffraction and dilatometry techniques. The thickness of the lamellae, the number of folds of the polymer chains, and the degree of crystallinity have been determined as functions of the cr…
Viscoelastic relaxation of supercooled liquids. II
Abstract In addition to the six liquids for which the results of viscoelastic measurements are reported in part I, studies have also been made on a further eight liquids which differ widely in molecular composition, namely: squalane, tri(β-chloroethyl) phosphate, tri(o-tolyl) phosphate, tri(m -tolyl) phosphate, tris(2…
Effect of Sample Geometry on Magnetomorphic Oscillations in the Hall Effect in Cadmium at Liquid-Helium Temperatures
Size-effect oscillations in the Hall resistivity have been studied in a monocrystal of highly pure cadmium at liquid-helium temperatures. Samples ranging in thickness from 2.01 to 0.09 mm were prepared from a single monocrystal by successively reducing the thickness using spark planing followed by electropolishing. Th…
Effect of Pressure on the Elastic Parameters and Structure of CdS
The effective elastic constants of CdS have been measured by the ultrasonic pulse-echo method as a function of hydrostatic pressure to 4 kbar. The logarithmic pressure derivatives determined were $\frac{d\mathrm{ln}{C}_{11}}{\mathrm{dP}}=3.56$, $\frac{d\mathrm{ln}{C}_{33}}{\mathrm{dP}}=3.44$, $\frac{d\mathrm{ln}{C}_{1…
Phonon-Drag Part of the Thermoelectric Power in Metals
A formula for the phonon-drag part ${S}_{g}$ of the thermoelectric power in metals is obtained by assuming that the electron scattering processes can be described by a relaxation time $\ensuremath{\tau}(\mathrm{k})$. The formula differs from the simplest variational expression only by having extra factors of $\ensurem…
THERMAL EVIDENCE OF A GLASS TRANSITION IN GOLD-SILICON-GERMANIUM ALLOY
The specific heat of a ``splat''-formed amorphous alloy of gold-silicon-germanium exhibits a very steep rise with increasing temperature near 295°K to a peak and then begins to fall before crystallization occurs. These last Cp values fall on a reasonable extrapolation of the high temperature Cp-T relation found for th…
NMR Study of Ferroelectric LiNbO3 and LiTaO3. I
A study of the 7Li nuclear magnetic resonance in a LiNbO3 single crystal is made and the electric field gradient at the lithium site is determined. Electric-field-gradient calculations indicate that the net charge on the niobium is +1.59 while that on the oxygens is −0.86. This shows that the niobate ion is predominat…
Crystal Structure of Paramagnetic DyMn2O5 at 298°K
Paramagnetic DyMn2O5 crystallizes in the orthorhombic system with lattice constants a=7.2940±0.0008, b=8.5551±0.0008, and c=5.6875±0.0008 Å, in the space group Pbam(D2h9). There are four DyMn2O5 per unit cell. The crystal structure was solved by a combination of three-dimensional Patterson and Fourier series and refin…
Physical Properties of Aromatic Hydrocarbons. II. Solidification Behavior of 1,3,5-Tri-α-Naphthylbenzene
The kinetics of solidification of 1,3,5-tri-α-naphthylbenzene have been studied from 25° above the glass temperature (69°C) almost to the crystal thermodynamic melting point (199°C). The crystal growth rate has been analyzed using current theories of crystallization and a mechanism for crystal growth has been proposed…
Raman Spectra of CaW O 4 , SrW O 4 , CaMo O 4 , and SrMo O 4
The first-order Raman spectra of CaW${\mathrm{O}}_{4}$, CaMo${\mathrm{O}}_{4}$, SrW${\mathrm{O}}_{4}$, and SrMo${\mathrm{O}}_{4}$ have been obtained. All theoretically predicted vibrations have been observed, and assignment has been given for the internal vibrations of the tungstate and molybdate ions as well as for t…
Magnetic Resonance Studies of Ferroelectric Methylammonium Alum
The electron paramagnetic resonance of C${\mathrm{H}}_{3}$N${\mathrm{H}}_{3}$Al${(\mathrm{S}{\mathrm{O}}_{4})}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}12${\mathrm{H}}_{2}$O (MASD) doped with ${\mathrm{Cr}}^{3+}$ was studied from 90 to 300\ifmmode^\circ\else\textdegree\fi{}K. At the first-order ferroelectric Curi…