Effect of grinding chemicals and aids on the grinding efficiency and the performance of Portland cement

Date

2023-8

Author

Kalkan, Ömer Faruk

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Cement production is an energy-intensive process. Cement grinding alone accounts for a third of the total energy used in this process. Improving grinding efficiency is therefore crucial to saving energy. Grinding aids (GA), chemical substances that improve grindability, are adsorbed on the cement surface and reduce its surface energy. As a result, the cement particles agglomerate less during grinding and form a finer cement, leading to increased energy efficiency. In addition, GAs can also affect consistency of the cement mortar and alter the mechanical properties of the cement. This study evaluates the performance of some grinding chemicals (GCs) and GAs, which are mixtures of GCs, on the properties of cement. Amines, polyols, defoamers and polycarboxylate ethers (PCE) are used as GCs. Tests are carried out at constant specific energy consumption (SEC) and their performance at fixed fineness is estimated by regression. Among the GCs, at constant fineness, propyleneglycol (PG) provided the highest energy savings at 9.8%, AF-A provided the highest flow increase at 15.2%, tetrahydroxyethylethylenediamine (THEED) provided the highest early strength increase at 9.4%, and monoethyleneglycol (MEG) provided the highest standard strength increase at 6.7%. Moreover, it was also shown that GCs can be optimized to obtain GAs. Among the GAs tested, GA-E provided the highest energy savings at 12.1%, GA-A provided the highest flow increase at 17.9% and the highest standard strength increase at 17.5%, and GA-C provided the highest early strength increase at 23.1%.

Subject Keywords

Grinding aid, Specific energy consumption, Surface energy

URI

https://hdl.handle.net/11511/105266

Collections

Graduate School of Natural and Applied Sciences, Thesis