A New Homogeneity Assessment Concept Applied to Evaluate Self-Consolidation and Segregation Stability of Self-Consolidating Concrete

Author(s): Florian V. Mueller, Olafur H. Wallevik, Kamal H. Khayat
Paper category: Conference
Book Title: 8th International RILEM Symposium on Self-Compacting Concrete - SCC 2016
Editor: Kamal H. Khayat
ISBN: 978-2-35158-156-8
e-ISBN: 978-2-35158-157-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 123-132
Total Pages: 10
Language: English

Abstract: The resistance to segregation is an important property to obtain a homogeneous concrete structure, in particular when using self-consolidating concrete (SCC). Most measurement approaches assess stability in fresh state, thereby applying different principles to estimate the risk of segregation. Some approaches may raise concern of how application-oriented these tests actually are. Other concerns involve whether the interaction with an artificial penetration body required to assess stability in some test methods can actually affect the segregation response of the concrete. A new concept to assess the homogeneity of hardened concrete is developed, partially with describing the occurrence of large aggregate particles in the surface zone when applying the aggregate surface appearance index (ASAI), but mainly in rating the vertical distribution of specific gravity with some specified classes typically occurring (CSGD). Thereby, the proposed method can be used to quantify the self-consolidation property of SCC and to evaluate the risk of segregation. The assessment criteria can also consider the influence of dynamic segregation. The method is intended for application in the development phase of a SCC mixture design, as the major assessment takes place in the hardened state. Conformity of design parameters and rheology parameters would imply the confirmation of the stability once determined, and enable the reduction of acceptance tests prior to SCC placement. The results indicate high accuracy and good repeatability for both rating systems the concept consists of, while the test remains relatively easy and requires only basic technical equipment.

Online publication: 2016
Publication Type: full_text
Public price (Euros): 0.00