Materiales de Construcción, Vol 62, No 307 (2012)

Interaction between cements with different composition and superplasticizers


https://doi.org/10.3989/mc.2012.63610

H. Y. Ghorab
Helwan University, Egypt

I. M. Kenawi
Cairo University, Egypt

Z. G. Abdel All
Arab Dairy Products Co, Egypt

Abstract


The slump behavior of ordinary Portland-, pozzolanic (red brick powder)-, sulfate resistant-, and limestone cement pastes caused by ≤ 1% additions of polycondensates and polycarboxylates superplasticizers are monitored for up to 90 minutes.

With the plolycondensates, Portland- and pozzolanic cements gain fluidity at higher dosages than sulfate resistant and limestone cements. Limestone cement shows the best slump retention. The aluminate and sulfate phases play a major role in the fluidity.

With the polycarboxylates, all cements gain fluidity with dosages of ≤ 0.3%. A polycarboxylate with no resonance of methyl methylene proton in the main chain identified in the NMR spectra creates good slump retention. This is explained by a low mobility of the structure and the predominance of the steric effect. The polycarboxylate shows also strong ether bands relative to the ester groups in the IR spectra and a low polydispersity observed in the elution of few low molecular weight species in the HPLC chromatogram.

Keywords


cement; superplasticizers; compatibility; fluidity; minislump

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