The influence of a CaO-based expansive additive on volume changes, residual stress development, and strength evolution in cementitious materials

Authors: A. Samdariya, G. Sant, M. Dehadrai, J. Weiss
Paper category: conference
Book title: Concrete Durability and Service Life Planning – ConcreteLife’09
Editor(s): K. Kovler
Print ISBN: 978-2-35158-074-5
e-ISBN: 978-2-35158-085-1
Publisher: RILEM Publications SARL
Publication year: 2009
Pages: 457 – 465
Total Pages: 9
Language: English

Abstract: This paper examines unrestrained volume changes (autogenous and drying), tensile strength and elastic modulus evolution, and restrained autogenous volume change behavior of cement pastes containing a CaO-based expansive additive. The results indicate that mixtures containing such an additive experience significant early-age expansions. While the total shrinkage experienced by mixtures containing the additive is less than plain systems; the drying shrinkage experienced is similar to plain systems independent of the additive dosage. Under restrained conditions, the additive induces the development of a compressive stress which reduces the magnitude of shrinkage-induced tensile stresses in the system. The magnitude of the compressive stress developed is related to the additive concentration and the peak free expansion strain experienced by the material. However, the results indicate a critical additive dosage needs to be surpassed to reduce the risk and potential for cracking in the material at early-ages.

Online publication: 2012-05-16
Publication Type: full_text
Public price (Euros): 0.00