The influence of mix composition and curing conditions on shrinkage cracking of cementitious materials

Author(s): Hans Beushausen
Paper category: Proceedings
Book title: Proceedings of the 2nd International RILEM/COST Conference on Early Age Cracking and Serviceability in Cement-based Materials and Structures Volume 1
Editor(s): Stéphanie Staquet and Dimitrios Aggelis
ISBN:978-2-35158-199-5
e-ISBN:978-2-35158-198-8
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 39-50
Total Pages: 12
Language : English

Abstract: Cracking related to the restraint of shrinkage deformations can negatively affect durability, structural performance and aesthetical appeal of concrete structures. The crack widths and time of occurrence depend on a range of factors related to constituent materials, mix design, environmental exposure, construction procedures, and conditions of restraint. This paper summarizes the outcome of various studies, in which crack-influencing parameters were investigated, including water/binder ratio, coarse aggregate content and size, and curing conditions. A simplified model for the prediction of the age at cracking is presented, based on relevant concrete material characteristics such as elastic modulus, tensile relaxation, shrinkage strain and tensile strength. The experimental investigations confirm that the analytical model is able to predict the age at cracking of cementitious materials with good accuracy. For concrete mixes, i.e. for mixes containing coarse aggregates, experimental results indicate that fracture mechanical aspects need to be considered in addition to the various crack-determining material properties. The ring test was found to be a suitable tool to assess the combined influence of various material parameters on the age at cracking.

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