Stability of superplasticizer and shrinkage-reducing admixtures
Stability of superplasticizer and shrinkage-reducing admixtures in high basic media

M. Palacios; F. Puertas

doi:10.3989/mc.2004.v54.i276.256

Stability of superplasticizer and shrinkage-reducing admixtures Stability of superplasticizer and shrinkage-reducing admixtures in high basic media

Authors

M. Palacios Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC)
F. Puertas Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC)

DOI:

https://doi.org/10.3989/mc.2004.v54.i276.256

Keywords:

organic admixture, stability, pH, spectroscopy

Abstract

The present study explores the stability of different superplasticizer (polycarboxylate, vinyl copolymers, melamine and naphthalene derivatives) and shrinkage-reducing (polyproplyene glycol derivatives) admixtures in water and several alkaline media: NaOH (pH= 11.7 and 13.6), Ca(OH)₂ (pH=l2.4) and waterglass (pH=13.0) solutions. The pH of the solutions was measured at different limes and the structural changes taking place in the admixtures were studied using FTIR, FT-Raman and UV-VIS techniques. All the admixtures, except the naphthalene and polypropylenglycol derivatives in the NaOH pH=l3.6 solution and the naphthalene derivative in waterglass (NaO₂-nSiO₂-mH₂O + NaOH), are unstable at pH > 13.0. The other admixtures all undergo structural changes in highly basic media that explain the loss of their fluidifying properties under these conditions.

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Published

2004-12-30

How to Cite

Palacios, M., & Puertas, F. (2004). Stability of superplasticizer and shrinkage-reducing admixtures Stability of superplasticizer and shrinkage-reducing admixtures in high basic media. Materiales De Construcción, 54(276), 65–86. https://doi.org/10.3989/mc.2004.v54.i276.256

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Issue

Vol. 54 No. 276 (2004)

Section

Research Articles

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