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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Novel Admixtures to Reduce the Stickiness of Low W/C Concretes
Author(s): Manuel Ilg and Johann Plank
Publication: Special Publication
Appears on pages(s): 77-88
Keywords: concrete; stickiness; superplasticizer; non-ionic co-dispersant; polycarboxylate; flow properties; V-funnel; self-compacting concrete
Abstract:Concretes formulated at low water-cement ratios exhibit good material properties. Nevertheless, such concretes exhibit a honey-like consistency with a low speed of flow (“creeping behavior”) which is highly undesirable. In this paper it is shown that non-ionic small molecules can help to improve the fluidity at low water-cement ratios significantly and eliminate the “stickiness” when combined with ordinary PCE superplasticizers. For this purpose, different non-ionic glycol derivatives were screened via mini-slump testing. It was found that especially less polar species behave as very powerful co-dispersants. To gain a more profound understanding of the working mechanism, heat flow calorimetry was carried out. Additionally, concrete lab tests were performed to ascertain the impact of the non-ionic molecules on the V-funnel empty time of SCCs. Based on adsorption measurements it is inferred that the co-dispersants act as osmotic spacers which keep the cement particles apart and prevent them from agglomeration.
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