Nghiên cứu ảnh hưởng của hỗn hợp diethyl glycol và diethanolisopropanolamine đến quá trình nghiền và một số tính chất của xi măng Pooc lăng

Abstract

The objective of this study is to compare the effects of a mixture of diethyl glycol (DEG) and diethanolisopropanolamine (DEIPA) with using each of these additives individually on the grinding process and some properties of Portland cement. Grinding aid additive contents were 0.01% DEG and mixture (0.005% DEG + 0.005% DEIPA). The properties investigated included: grinding time, particle size distribution, water of consistency, setting time, and compressive strength at 1, 3, 7, 28 days of age. The results of this study were compared with the results of 0.01% DEIPA in the author's previous study. Research results show that using the mixture of additives increased grinding performance better than using individual additives; DEG samples improved the least. Mixed additives samples had lower proportions of fine particles and higher proportions of coarse particles than samples using individual additives; The DEG sample had the highest proportions of fine particles and the lowest proportions of coarse particles. The water of consistency of samples with grinding aids was not much different, all were about 0.5% higher than the reference sample. The difference in setting time between samples was not much, they all meet the requirements of TCVN 2682:2020. Cement samples ground together with the additive mixture improved the early and late strength less than when each additive was used separately; cement samples ground together with DEG had the best strength improvement.