Preliminary Findings from Research to Extend Internal Curing Concepts to Mixtures with Higher Volumes of Fly Ash

Title: Preliminary Findings from Research to Extend Internal Curing Concepts to Mixtures with Higher Volumes of Fly Ash
Author(s): I. De la Varga, J. Castro, J. Weiss
Paper category : conference
Book title: International RILEM Conference on Material Science
Editor(s): W. Brameshuber
Print-ISBN: 978-2-35158-110-0
e-ISBN: 978-2-35158-111-7
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 141 - 153
Total Pages: 13
Nb references: 28
Language: English

Abstract: Fly ash has historically been used in concrete transportation structures. Recent interest has developed in the US to reduce the clinker content (ordinary Portland cement) in concrete as a method to improve sustainability. This paper reports preliminary results from an ongoing research project that is investigating the use of higher volumes of fly ash (higher than what is currently permitted) in transportation structures. The paper focuses on testing performed on three mortar mixtures: a water to cement ratio (w/c) of 0.42, a w/c of 0.30, and water to cementitious ratio (w/cm) of 0.30 with 40% fly ash by volume. Compressive strength, elastic modulus, autogenous shrinkage and restrained shrinkage testing were performed. Chemical shrinkage, internal relative humidity, and moisture desorption measurements are presented to better understand how self-desiccation results in autogenous shrinkage and residual stress. In addition, this research lays the groundwork for extending internal curing concepts to these mixtures.

Online publication: 2010-12-02
Publication type : full_text
Public price (Euros): 0.00