Reaction cements

Mansion, R. Gleed, P. T. (1985). Reaction cements as materials for the sustained release of trace elements into the digestive tract of cattle and sheep. II. Release of cobalt and selenium. Journal of Veterinary Pharmacology Therapeutics, 8, 374-81. 

Alan Wilson and John Nicholson, Acid base reaction cements... 

The ettringite that is formed exhibits distinet eementing properties, but may cause expansion at a different rate and to a different degree, depending on the Al source involved in the reaction. Cements that eontain significant amounts of calcium sulfate include expansive cements (see seetion 21), regulated set cement (see section 5.2), supersulfated cement (see section 8.4), sulfobelite cement (see section 4.2), and sulfoalite cement (see section 4.3). Limited amounts of ealeium sulfate are also present in Portland cement (see section 2) and blended eements (see section 7). 

Tong, L., and Tang, M. (1995) Correlation between reaction and expansion of alkaU-caibonate reaction. Cement and Concrete Research 25,470-476. 

Glasser, E, Marchand, J., Samson, E., 2008. Durability of concrete. Degradation phenomena involving detrimental chemical reactions. Cement and Concrete Research, 38(2), pp. 226-246. 

There is, with acid phosphate reaction cements, a relationship with bond strength and the rate of reaction. The rate of reaction of oxides with phosphoric acid depends on the basicity ofthe oxide. The reaction between aluminum oxide and phosphoric acid is slow enough to permit gradual development of the phosphate bonds. The zinc oxide reaction is so rapid that the structure develops no cohesion. 

Cementation is also considered a ceramic fabrication process (Figure 13.10). The cement material, when mixed with water, forms a paste that, after being fashioned into a desired shape, subsequently hardens as a result of complex chemical reactions. Cements and the cementation process were discussed briefly in Section 13.7. 

Hesse, C., E Goetz-Neunhoeffer and J. Neubauer (2011). A new approach in quantitative in-situ XRD of cement pastes Correlation of heat flow curves with early hydration reactions . Cement and Concrete Research 41(1) 123-128. 

Secondary aluminate reaction (cement hydration) Rate increase of the CjA/aluminate hydration reaction related to the depletion of solid calcium sulfate and a drop in sulfate concentrations in the system. To ensure correct setting and strength development, this reaction should occur well after the main hydration peak of alite. 

Dental cements are a diverse class of material of widely different chemistries and applications (2,3). However, all may be classified as acid-base reaction cements formed by mixing a powder(base) with an acidic liquid. A typical example, the traditional zinc phosphate, is the product of the reaction between a zinc oxide powder and a concentrated solution of phosphoric acid. The cement sets, within minutes, as an amorphous zinc orthophosphate gel is formed. 

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