Retarding effect of superplasticizer on the hydration of Portland cement

Title: Retarding effect of superplasticizer on the hydration of Portland cement
Author(s): L.Z. Xiao, X.S.Wei and Z.J.Li
Paper category : conference
Book title: International RILEM Conference on Advances in Construction Materials Through Science and Engineering
Editor(s): Christopher Leung and K.T. WAN
ISBN: 978-2-35158-116-2
e-ISBN: 978-2-35158-117-9
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 200 - 207
Total Pages: 8
Nb references: 11
Language: English

Abstract: Electrical measurement was used to investigate the early hydration characteristics of cement pastes with different dosages of two superplasticizers for the same water cement ratio. SEM and FTIR were used to observe the hydration products at different times in early age. It is found that the superplasticizers retarded the formation of C-S-H gel before the transition point on the resistivity curve and enhanced the formation of C-S-H after the transition point; the time for AFt formation at early age and the types of the hydration products in the hardened samples are not influenced by the superplasticizer addition. The time (tt) to reach the transition point on the resistivity curves is strongly related to the initial setting time and final setting time.

Online publication: 2011-10-31
Publication type : full_text
Public price (Euros): 0.00