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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: Comparative Study of Influence of Superplasticizers and Superplasticizer/Plasticizer Blends on Slump-loss
Author(s): A. Goncalves and A. Bettencourt-Ribeiro ,
Publication: Special Publication
Appears on pages(s): 321-334
Keywords: concrete; loss (slump); superplasticizer
Abstract:In order to obtain specific concrete properties for distinct applications on site, the use of blends of different admixtures should be considered. During the construction of a roadway bridge, with long and large piles in an aggressive chemical environment, a comparative study was made to analyse the effect of blending of a melamine-based superplasticizer with triethanolamine-based admixtures, and polycarboxylate with lignosulphonate-based admixtures by the other side, on the slump loss of a flowable concrete. The performance of a mixture of plasticizer/superplasticizer was compared with that obtained by the single use of the individual admixtures. A naphthalene sulphonate-based admixture was also investigated. The results show that blending of modified lignosulphonate with polycarboxylate based admixtures in lower dosages, produces a significant synergistic action that provides improvements on slump-loss, with only a small delay in the initial setting time. With polycarboxylate based admixtures it is possible to get significant slump retention without compromising the early strengths
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