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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: Adsorption of Superplasticizers on Calcium Aluminate Monosulfate Hydrate
Author(s): Franco Massazza, Umberto Costa,
and Alessandro Barrila
Publication: Special Publication
Appears on pages(s): 499-514
Keywords: admixtures; adsorption; calcium sulfoaluminate hydrates;
dispersants; lignin and derivatives; melamine-formaldehyde resins;
plasticizers; thermal gradient; x-ray diffraction; zeta potential.
Abstract:This work examines the course of the adsorption and the variations in the surface charge observed when monosulphate is dispersed in an aqueous or dimethylsulphoxide solution containing li-gnosulphonate, naphtalene formadehyde condensate and formaldehyde condensate. Melamine The adsorption isotherms obtained by using dimethylsulphoxide of Langmuir type. Are In the aqueous medium adsorption is characterized by a maximum beyond which it decreases. The measurements of Zeta potential carried out on monosulphate dispersed in solutions of the admixtures pointed out a nearly linear increase in the negative charge of the particles up to a value corresponding to the maximum of the adsorption isotherms; beyond this value the potential remains constant. The values of Zeta potential justify the dispersing effect caused by the admixtures due to repulsion among the particles.
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