Role of different superplasticizers on hydrated lime pastes and mortars
Keywords: 
Metakaolin
Nanosilica
Zeta potential
Pozzolan
Admixture
Issue Date: 
13-Oct-2015
Editorial note: 
The Chinese Ceramic Society; China Building Materials Academy
Citation: 
Durán A, Navarro-Blasco I, Pérez-Nicolás M, Sirera R, Fernández JM, Álvarez JI. ""Role of different superplasticizers on hydrated lime pastes and mortars"". EN: The 14th International Congress on the Chemistry of Cement. Abstracts Book 2015 Vol II:327. Oral presentation
Abstract
The behaviour of different superplasticizers admixtures was assessed for hydrated lime pastes and mortars. Sometimes, air lime pastes and mortars were modified with two supplementary cementing materials (SCMs), namely nanosilica (NS) and metakaolin (MK). Two different polycarboxylate ethers, a lignosulfonate and a naphthalene condensed sulfonate superplasticizer were added to lime pastes and mortars and their effects on fresh-state properties as well as on the mechanical strengths were evaluated. A close relationship was found between the molecular architecture of the plasticizers and the flowability of the pastes. Zeta potential assessment allowed us to elucidate the main action mechanisms for these admixtures. In the case of polycarboxylate ethers, the large specific surface area of nanosilica led to a large SPs consumption as compared with metakaolin with lower surface area. However, polycarboxylate ethers in MK-lime samples were attached favourably to the C-S-H and aluminate hydrates, so that the dispersing action was greater with respect to NS-lime suspensions.

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