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Thursday, 17 October 2019
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Raw materials & technologies, Raw materials

Polymer grinding aids effect the strength of cement

Tuesday, 15 July 2014

Chinese researchers examined the effect of polymer grinding aids on the grindability and strength of cement.

Different polymer grinding aids were investigated for concretes

Source: BASF SE

Different polymer grinding aids were investigated for concretes

Source: BASF SE

They synthesised different polymer grinding aids (GA) from maleic anhydride (MA), polyethylene glycol (PEG), and acroleic acid (AA) under different process conditions, and their effects on the grindability and strength enhancement of cement.

Surface area and flexural strength increased

The results showed that esterification was preferably conducted at a MA : PEG ratio of 1.2 : 1 at 105°C for 3 h with 1.5% catalyst; and copolymerisation was preferably conducted at a MA-PEG : AA ratio of 1 : 1 at 85°C for 6 h. The number-average molecular weight of the polymer GAs was 12,964, the weight-average molecular weight was 18,156, and the polydispersity index was 1.40, respectively. The specific surface area of the samples obtained under the optimum condition increased by 32.87%, the flexural strength increased by 12.5% at 3d and 16.67% at 28d, and the comprehensive strength increased by 42.06% at 3d and 22.19% at 28d as compared with the control sample.

The study is published in: Journal of Applied Polymer Science, Early View.

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