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Published in:
2021 | OriginalPaper | Chapter
Impact of the Granulometric Composition of Raw Sludge on the Characteristics of Portland Cement
Authors : D. A. Mishin, S. V. Kovalev, D. V. Smal
Published in: Environmental and Construction Engineering: Reality and the Future
Publisher: Springer International Publishing
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Abstract
An increase in the activity of the cement of Plant 1 was made by changing the granulometric composition of its sludge. The change in the granulometric composition of the sludge of Plant 1 was made due to the coarsening of the grinding, by inserting limestone with a fraction of 0.315–0.2 mm in the amount of 3 and 6% wt. and due to the re-grinding of the sludge during the 0, 5, 10, 30, 60, 90 min in a 1-L mill with a standard range of grinding environment at a humidity of 37%. It was found that with an increase in the fineness of the sludge grinding, a more complete absorption of calcium oxide is observed. The binding rate of free calcium oxide increases slightly up to a mixture with 10 min of re-grinding. Then, at 30 min of re-grinding, the binding rate of calcium oxide increases dramatically. In the clinker from the ground sludge, an increase in the proportion of synthesized alite is observed.
The relation between the fineness of the raw mix and the strength of the cement is not linear. There is optimum fineness of grinding at 10 min of the re-grinding, which maximizes the strength of cement at 28 days of hardening in water. An increase in the time of re-grinding more than 10–30 min leads to a decrease in strength.