Effect of polycarboxylate superplasticizers on large amounts of fly ash cements

•Interaction polycarboxylate superplasticizer–cement with high porosity fly ash was studied.•Liquid polycarboxylate (LPC) and solid polycarboxylate (SPC) were used.•Both increase fluidity and decrease water demand of cement products.•SPC mortars present the highest compressive strengths and lowest w...

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Bibliographic Details
Published in:Construction & building materials 2013-11, Vol.48, p.628-635
Main Authors: Toledano-Prados, Mar, Lorenzo-Pesqueira, Miriam, González-Fonteboa, Belén, Seara-Paz, Sindy
Format: Article
Language:English
Subjects:
Analysis
Cement
Cement paste
Concrete
Fly ash
Mortar
Polycarboxylate superplasticizers
Porosity
Properties
Solid superplasticizers
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Summary:•Interaction polycarboxylate superplasticizer–cement with high porosity fly ash was studied.•Liquid polycarboxylate (LPC) and solid polycarboxylate (SPC) were used.•Both increase fluidity and decrease water demand of cement products.•SPC mortars present the highest compressive strengths and lowest water absorption.•The dose of 0.15% of SPC is the one that provides the best performance. This study analyzes the interaction between polycarboxylate superplasticizers and cements with large amounts of high porosity fly ash. The analysis was performed with two polycarboxylate superplasticizers: a liquid commercial polycarboxylate with polyoxyethylene side chains (LPC) and an experimental solid polycarboxylate (SPC). The conclusions confirm that the use of these types of superplasticizers improves cement behavior, increasing fluidity and decreasing the water demand of cement products. LPC is slightly more effective than SPC. With regard to hardened performance, SPC provides cement mortars with a denser structure which leads to higher compressive strengths and lower water absorption capacity than in both mortars containing cement without superplasticizer and the mortar with LPC. The best performance was had with a dose of 0.15% SPC.
ISSN:0950-0618
DOI:10.1016/j.conbuildmat.2013.07.069