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HPMC and HEMC influence on cement hydration

Pourchez, J. / Peschard, A. / Grosseau, P. / Guyonnet, R. / Guilhot, B. / Vallee, F.

Cellulose ethers such as hydroxyethylmethyl cellulose (HEMC) and hydroxypropylmethyl cellulose (HPMC) are common admixtures in factory made mortars. Nevertheless, their use principally remains empirical, and no cement-admixture interaction mechanism has ever been rigorously demonstrated. The main issue of this publication deals with the control of secondary effects generated by these admixtures such as the retardation of cement hydration. In this frame, a study of the impact of HEMC and HPMC molecule parameters on the modification of cement hydration was carried out. Minor influence of the molecular weight and of the hydroxypropyl or the hydroxyethyl group content was observed. On the contrary, the results emphasize that the methoxyl group content appears as the key parameter of the hydration delay mechanism.

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HPMC and HEMC influence on cement hydration

Pourchez, J. / Peschard, A. / Grosseau, P. / Guyonnet, R. / Guilhot, B. / Vallee, F.

Cellulose ethers such as hydroxyethylmethyl cellulose (HEMC) and hydroxypropylmethyl cellulose (HPMC) are common admixtures in factory made mortars. Nevertheless, their use principally remains empirical, and no cement-admixture interaction mechanism has ever been rigorously demonstrated. The main issue of this publication deals with the control of secondary effects generated by these admixtures such as the retardation of cement hydration. In this frame, a study of the impact of HEMC and HPMC molecule parameters on the modification of cement hydration was carried out. Minor influence of the molecular weight and of the hydroxypropyl or the hydroxyethyl group content was observed. On the contrary, the results emphasize that the methoxyl group content appears as the key parameter of the hydration delay mechanism.

HPMC and HEMC influence on cement hydration

Pourchez, J. / Peschard, A. / Grosseau, P. / Guyonnet, R. / Guilhot, B. / Vallee, F.

Cellulose ethers such as hydroxyethylmethyl cellulose (HEMC) and hydroxypropylmethyl cellulose (HPMC) are common admixtures in factory made mortars. Nevertheless, their use principally remains empirical, and no cement-admixture interaction mechanism has ever been rigorously demonstrated. The main issue of this publication deals with the control of secondary effects generated by these admixtures such as the retardation of cement hydration. In this frame, a study of the impact of HEMC and HPMC molecule parameters on the modification of cement hydration was carried out. Minor influence of the molecular weight and of the hydroxypropyl or the hydroxyethyl group content was observed. On the contrary, the results emphasize that the methoxyl group content appears as the key parameter of the hydration delay mechanism.

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Title:

HPMC and HEMC influence on cement hydration

Contributors:

Pourchez, J. (author) / Peschard, A. (author) / Grosseau, P. (author) / Guyonnet, R. (author) / Guilhot, B. (author) / Vallee, F. (author)

Published in:

Cement and Concrete Research ; 36 ; 288-294

Publication date:

2006

Size:

7 Seiten, 17 Quellen

ISSN:

DOI:

https://doi.org/10.1016/j.cemconres.2005.08.003

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Hydratisieren , Ether , Cellulose , Mörtel , Additiv , organische Verbindung , hydraulischer Zement

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