Materials Literature
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The hydration reaction of high alumina cement at a temperature of 20 ºC and water/cement ratio of 0.5 has been studied over a period of one month. The changes of the solid phase were followed by X-ray diffraction and thermal analysis. Besides, pore-solution was expressed by application of high mechanical pressure (500…
This paper re-examines the relationship between durability and conversion of calcium aluminate cement concretes, CACC. Conversion is a natural and inevitable process whereby these materials reach a stable mature condition. Numerous structures built more than half a century ago remain serviceable and in service today.…
The hydration of calcium aluminates cements is dominated by that of CA, CaAl2O4, which is a major constituent of all of them. At ambient temperatures, CAH10 and an amorphous phase are formed initially, but these are metastable and slowly (or more rapidly if exposed to higher temperatures) transform into C3AH6 and gíbb…
Instrumental techniques are indicated and the most adequated methodologies for determining the nature of the binder in concretes are explained. These methods are: a) Determination of the Silicic Moduli through chemical analysis of the sample. This test reveáis very different valúes between cement portland based concre…
Different series of heterodinuclear complexes, viz.,|CuNiL](ClO 4 ) 2 •nH 2 O,[CuZnL](ClO 4 ) 2 •nH 2 O,[NiCuL](ClO 4 ) 2 •nH 2 O, and [NiZnL](ClO 4 ) 2 •nH 2 O complexes where L is a dinucleating Schiff base ligand derived from the condensation of 1 mole of 2-hydroxy-5-methylbenzene-1,3-dicarbaldehyde, 1 mole of 1,3-…
The electrochemical characteristics of poly(trans‐1,2‐di(2‐thienyl)ethylene) and its battery characteristics have been studied. Poly(trans‐1,2‐di(thienyl)ethylene)s prepared from both trans ‐1,2‐di(thienyl)ethylene and cis ‐1,2‐di(thienyl)ethylene show reversible doping‐undoping behavior and excellent charge‐discharge…