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Leserbrie / Letter to the editor
Ticker / Ticker
Pazifik , Palmen , Polymere / Pacific , Palms , Polymers
The efect of calcareous filler on portland cement mortars
The present paper deals with the influence that the addition of calcareous "fillers" to a Portland cement has on the mechanical resistances of its mortars. Taking as a basis a Portland cement to which calcareous "fillers", from 0 up to 50 percent, are added, test tubes of standardized mortars were prepared. After 7, 2…
Patente / Patents
Fachbücher / Reviews
Rheologie und Extrudierbarkeit keramischer Massen / Rheology and extrudability of ceramic compounds
Alteration mechanisms on the stones of the Catedral of Granada, Spain
The diverse alteration mechanisms which operate on the stony materials of the Granada Cathedral have been analized. The water action, anthropogenic influence, thermic oscillations, incompatibility factors, seismicity and biological factors have been considered.
Brevier / Brevier
Determinación de la resistencia del hornnigón en viguetas fabricadas con cemento aluminóso
Not Available.
Noticias
Probleme / Problems
Rheologische Probleme in der Lackind ustrie / Rheological problems in the paint industry
Neuheiten / Products
Messungen an elektrorheologischen Flussigkeiten mit Rotationsviskosimetern / Measurements on electrorheological liquids with rotational viscometers
Druckschriften / Literature
Origin of zeolite cements in the Miocene sandstones, North Tejon oil fields, California
Abstract Zeolite cement zoning from heulandite via heulandite + laumontite to laumontite is found in Miocene volcaniclastic sandstones at the North Tejon Oil Field, southern San Joaquin basin, California. The zeolite transition occurs at the depth range from 2703-2743 m (present temperature range: 90-92 degrees C). He…
Derivation of a general three-dimensional crack-propagation law: A generalization of the principle of local symmetry
We derive a general crack-propagation law for slow brittle cracking, in two and three dimensions, using discrete symmetries, gauge invariance, and gradient expansions. Our derivation provides explicit justification for the ``principle of local symmetry,'' which has been used extensively to describe two-dimensional cra…
Polyaniline Secondary Cells with Ambient Temperature Molten Salt Electrolytes
An Al/polyaniline (PAn) powder secondary cell with an or an electrolyte has been investigated. The configuration of the Al/PAn secondary cell with an acidic electrolyte was: open‐circuit voltage , , . A 24% increase in the discharge capacity over a BPC system electrolyte is obtained. The difference was attributed to t…