Inorganic cement

Solidification/stabilization processes play a more important role since, in the near future, only inert or stabilized wastes should be landfilled. Solidification/stabilization process means binding the hazardous material in the hydraulic binders for safe landfilling or use in civil engineering purposes. Various types of cement, inorganic binders and pozzolanas (e.g., coal burning fly ash, lime, blast-furnace slag and similar materials) are mostly used as the... 

Inorganic cement Inorganic cement and polymer Polymer... 

Inorganic cements (inorganic binders) are powdered materials that, if allowed to react with a suitable liquid phase (usually water or a water solution of an appropriate reactant), undergo chemical reactions associated— at an appropriate liquid/solid ratio— with the formation of a firm solid stracture. 

Ma, W., and Brown, P.W. (1992a) Cement-inorganic polymer composites, microstracture and strength development, in Proceedings 9th ICCC, New Delhi, Vol. 4, pp. 424-A29. 

Cement—(=inorganic cement) a powdered inorganic material which, if mixed with appropriate amounts of water, yields a suspension of plastic consistency that converts spontaneously into a hard solid body at ambient temperatures. 

There are occasions where the mud pH must be lowered such as after drilling fresh cement or overtreatment by one of the alkaline materials discussed. Organic acids that have been used for this purpose include acetic acid [64-19-7], citric acid [77-92-9], and oxaHc acid [144-62-7]. These materials are used infrequently. Inorganic additives used to lower pH levels include sodium bicarbonate [144-55-8] and sodium acid pyrophosphate [7758-16-9] (SAPP). Of the two, sodium bicarbonate is used the most by far. 

Retarders and Accelerators. Materials that control hardening of cement may be either organic or inorganic. Retarders are often incorporated in oil well cementing and hot-weather concrete appHcations, whereas accelerators may be useful for cold-weather concrete appHcations in which higher rates of reactivity are desirable. In most cases, these admixtures are used in low concentrations, suggesting that they act by adsorption. 

Inorg. adhesives inorganic adhesives cement, gypsum. 

Generally, cement-forming liquids are aqueous solutions of inorganic or organic adds. These adds include phosphoric add, multifunctional carboxylic adds, phenolic bodies and certain metal halides and sulphates (Table 2.1). There are also non-aqueous cement-forming liqtiids which are multidentate acids with the ability to form complexes. 

There is also the question of whether there are inorganic polyelectrolytes within the field of AB cements. A number of cements are based on orthophosphoric add, and in the two most important ones aluminium is... 

Wilson, A. D. Prosser, H. J. (1984). A survey of inorganic and polyelectrolyte cements. British Dental Journal, 157, 449-54. 

Dental silicate cement was also variously known in the past as a translucent, porcelain or vitreous cement. The present name is to some extent a misnomer, probably attached to the cement in the mistaken belief that it was a silicate cement, whereas we now know that it is a phosphate-bonded cement. It is formed by mixing an aluminosilicate glass with an aqueous solution of orthophosphoric acid. After preparation the cement paste sets within a few minutes in the mouth. It is, perhaps, the strongest of the purely inorganic cements when prepared by conventional methods, with a compressive strength that can reach 300 MPa after 24 hours (Wilson et al, 1972). 

Dental silicate cement is solely used for restoring anterior (front) teeth. It is probably the strongest purely inorganic cement and develops its strength rapidly. Although satisfactory in areas of the mouth washed by saliva it is... 

In 1968 Wilson published an account of his early search for alternatives to orthophosphoric acid as a cement-former with aluminosilicate glasses. Aluminosilicate glasses of the type used in dental silicate cements were used in the study and were reacted with concentrated solutions of various organic and inorganic adds. Wilson (1968) made certain general observations on the nature of cement formation which apply to all cements based on aluminosilicate glasses. 

Sulfoalkylated naphthol compounds are effective as dispersants in aqueous cement slurries. The compounds can also be applied in an admixture with water-soluble inorganic compounds of chromium to provide additives of increased overall effectiveness. Particularly suitable are sodium chromate or ammonium dichromate. a-Naphthol is reacted in an alkaline aqueous medium with formaldehyde to create condensation products. The aldehyde can be reacted with bisulfite to produce sulfoalkylated products [1404,1410]. 

At this moment, the price of the used granular PCM exceeds 10 EURO/kg due to the test production stage. Our calculation showed the cost payback time can be less than 10 years when the PCM cost would be reduced to 4 EURO/kg under the electrical utility rate condition in Japan. Further cost reduction will be needed to promote the actual system. In addition we have to care of flammability of paraffin wax as PCM in use of inside the buildings. Fortunately, PCM is placed under the OA floor board made of fireproof cement-mortal and above the concrete slab in this system. It may not have any problems under the Fire Defense Law in Japan. However, further development of noninflammable PCM granules, for example micro encapsulation of mixture of inorganic and organic PCM, is required. 

Practically all the inorganic building cements, such as mud, lime, and gypsum cement, are prepared as mixtures of at least three components a binder, a filler, and a medium, the latter always water. The binder (or binding material) is a substance that acts cohesively, adheres to surfaces and, when... 

Dining maintenance work on casings of fans used to extract perchloric acid fumes, seven violent explosions occurred when flanges sealed with lead oxide-glycerol cement were disturbed. The explosions, attributed to formation of explosive compounds by interaction of the cement with perchloric acid, may have involved perchlorate esters and/or lead salts. Use of an alternative inorganic silicate-hexafluorosilicate cement is recommended. 

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