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ESPCI Paris - PSL is a major institution of higher education (a French "Grande École d’ingénieurs"), an internationally renowned research center, and a fertile ground of innovation for industry. Founded by the City of Paris in 1882, for over a century the School has attracted leading scientific innovators like Nobel Prize laureates Pierre and Marie Curie, Paul Langevin, Frédéric Joliot-Curie, Pierre-Gilles de Gennes, and Georges Charpak, who continue to contribute to the institution’s international reputation. The School’s culture of excellence remains as vibrant as ever. Fully 60% of (…)
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Doctoral thesis viva voce: Wei Fan

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21 February 2012 14:00 » 18:00 — Boreau lecture theater

Synthesis of polycarboxylates poly (ethylene oxide) incorporating silane and di-phosphonate functions and study of their interactions with the cement in race condition with the sulphate ions.

Wei Fan, doctorant - PhD student Crédit : ESPCI ParisTech
Wei Fan, doctorant - PhD student Crédit : ESPCI ParisTechIt is well-established that a competitive adsorption exists between polycarboxylate superplasticizers (SP) and sulfate ions solubilized in the interstitial solution of cement paste, which may cause a loss of the dispersing properties. This has been explained by competitive weak ionic interactions between functional carboxyl groups and sulfate ions with cement grains. In this study, SPs including trialkoxysilane or bis-phosphonate functional groups have been synthesized. Adsorption and dispersing properties of these SPs were evaluated with a low alkali cement in the presence of different concentrations of Na2SO4 added in aqueous solution. It appears that the substitution of carboxyl groups by trialkoxysilane or bis-phosphonate in the polymer makes them more resistant to sulfate ions. We suggested that the high adsorption capacity of these SPs results from the formation of strong interactions between these new groups and cement grains. The improved compatibility of these new SPs with cements has been demonstrated through the method of Concrete Equivalent Mortar (CEM) in using two different cements.

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