Cementation by the carbonation of hydrated lime

✍ Scribed by D.R. Moorehead

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 553 KB
• Volume: 16
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(86)90044-x

✦ Synopsis

In this study, the factors which control carbonate cementation have been examined and several hypotheses developed to explain their interaction. These factors include the pressure, concentration, temperature and velocity of the carbonating gas as well as the thickness, temperature, gas permeability, moisture and Ca(OH)2 contents of the compact. Of these factors, the greatest limitation for the more popular application of the cement is related to the diffusion of the carbonating gas into thicker or less permeable products. A possible reaction mechanism for the cementing process has been outlined and the matrix examined by electron optics, X-ray diffraction, thermal analysis and mercury intrusion porosimetry. These methods have shown that, in general, the matrix is composed of mostly amorphous or very poor crystalline forms of calcium carbonate. The only phases detected by X-ray diffraction methods were a small percentage of unreacted portlandite Ca(OH) 2, and calcite. Less than half of the calcium carbonate formed was present as crystalline calcite.