Evolution of endogenous shrinkage of portland cement pastes

Author(s): A. Brahma
Paper category: Conference
Book title: 2nd International conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. Van Breugel, Wei Sun, Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 386-394
Total Pages: 8
Language: English

Abstract: In general, the cement paste is the only active phase of hydraulic mixtures. The behavior of cementitious materials is closely related to the evolution of cement pastes. The deformations at early ages may, under certain conditions, cause premature cracking of materials which can compromise performance and durability of structures in service. One of the factors through which the behavior of cement pastes can be analyzed is the degree of hydration which characterizes the state of the evolution of hydration reactions. In this study, we focus on the endogenous shrinkage of cement pastes. The evolution of shrinkage occurs in two phases governed by two different mechanisms. The first phase, the most important is of chemical origin. It is mainly due to a phenomenon called the Le Chatelier contraction. The second phase is counted from when the material is rigid enough to resist at the contraction due to the phenomenon of capillary depression. In this study we show that the evolution of endogenous shrinkage of cement pastes is influenced mainly by the increase in combined water. The parameters influencing the endogenous shrinkage of cement pastes were considered.

Keywords: cement pastes; combined water; chemical shrinkage, endogenous shrinkage; modeling.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00