Factors Influencing the Interactions between PCE Superplasticizers and Portland Cement

Author(s):Pascal Boustingorry, Caroline Autier and Nathalie Azema
Paper category: Proceedings
Book title: Proceedings of International Conferences (ICACMS) Advances in Construction Materials and systems Vol 2
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN: 978-2-35158-194-0
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 54-63
Total Pages: 10
Language : English

Abstract: The so-called incompatibility between a PCE superplasticizer and a given cement often leads to technical problems such as rise in required dosage, thus in cost, workability increase through time, decrease in early strength, etc. This paper aims at illustrating two different root causes for incompatibility, one linked to a polymer structure which is unfit for a sufficient dispersing effect, the other to a cement-related parameter which changes the pore solution composition. In the first part, the influence of polymer structure, and precisely grafting ratio at constant graft length, is shown to induce a non-monotonous influence on the sedimentation regimes and dispersion states of cement suspensions. This behaviour may be explained by observing how adsorption is affected by polymer structure. In a second part, following the seminal work by Yamada et al. [1], it is shown that the sulphate ions released by cement into the pore solution interfere with PCE adsorption, leading to a decreased state of dispersion at equal dosage. This phenomenon is correlated to a very precise cement property.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00