Mode of Action of Superplasticizers


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Title: Mode of Action of Superplasticizers

Author(s): T. A. Burge

Publication: Special Publication

Volume: 195


Appears on pages(s): 101-126

Keywords: admixture; adsorption; concrete; polymer; rheology; superplasticizer

Date: 7/1/2000

Depending on the nature of the materials used, the characteristics of both fresh and hardened concrete can be systematically altered with concrete admixtures. Special investigations were carried out on different polymers used as superplasticizers to determine the mode of action. The emphasis of the investigations was on the adsorption behaviour of the polymers on different cements phases and their influence on the rheological properties of mortar. The adsorption behaviour was investigated by High Performance Liquid Chromatography and the rheological properties were determined in standard mortar mixtures by the flow table spread measurement and by using the Viskomat NT to determine the flow characteristics. Additionally pore solutions were analized Based on these results some interesting correlations co used to explain the mode of action of superplasticizers.