EFFECTIVENESS OF TRIETHANOLAMINE ON GRINDABILITY AND PROPERTIES OF PORTLAND CEMENT IN LABORATORY BALL AND VIBRATING DISK MILLS

摘要

The aim of the present research work is to evaluate the effectiveness of one of the industrially most popular grinding aids(triethanolamine, TEA) on grindability, set and strength behavior of Portland cement in laboratory ball and vibrating diskmills when added at the same amount of 0.06 % by the weight of the cement. The results show that TEA is more effectivein ball mill than in vibrating disk mill. It increases the Blaine specific surface area of the mixtures of 95 % clinker and5 % gypsum by 16 and 7.6 % in ball and vibrating disk mills, respectively, compared to the blank test. The cement samplesproduced from the two mills were then tested for their initial and final setting times, spread diameter as a consistencymeasure and compressive strengths after 3, 7 and 28 days of curing. In both mills, addition of TEA increases both initialand final setting times and decreases compressive strengths at 3-, 7- and 28-day curing ages. The effects, however, are moresignificant in ball mill compared to vibrating disk mill.