Bibliographic Details
| Title: |
Dedolomitization in different alkaline media: Application to Portland cement paste |
| Authors: |
García, E. engarcia@natura.geo.ub.es, Alfonso, P.1, Labrador, M.1, Galí, S.1 |
| Source: |
Cement & Concrete Research. Sep2003, Vol. 33 Issue 9, p1443. 6p. |
| Subjects: |
Dolomite, Alkali lands, Dynamics |
| Abstract: |
The dedolomitization reaction kinetics is studied through several long-term experiments consisting of an aqueous dispersion of fine powders of dolomite and portlandite with alkalinity between 0.1 and 1 M KOH, at 25 and 75 °C. The experimental results are numerically simulated to calculate the apparent dissolution constant rates for dolomite, kdol. At low temperature, two dissolution stages were observed. In an early stage, part of dolomite powder dissolves quickly until an apparent steady is reached. After several days, the reaction continues at a lower rate. The calculated dissolution rate for dolomite in the first stage is one order of magnitude higher than that of the second stage. At 75 °C, the kdol is two orders of magnitude higher than at 25 °C. The addition of alkali increases the kdol at high temperature, but reduces it at room temperature. [Copyright &y& Elsevier] |
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| Database: |
Engineering Source |
