98. Mechanical properties of high volume fly ash self compacting concretes

Title: 98. Mechanical properties of high volume fly ash self compacting concretes
Author(s): P. Dinakar, K.G. Babu, M. Santhanam
Paper category : conference
Book title: 5th International RILEM Symposium on Self-Compacting Concrete
Editor(s): G. De Schutter and V. Boel
Print-ISBN: 978-2-35158-047-9
e-ISBN: 978-2-35158-088-2
Publisher: RILEM Publications SARL
Publication year: 2007
Pages: 651 - 657
Total Pages: 7
Nb references: 16
Language: English

Abstract: This article describes the results of an investigation aimed at producing and evaluating SCCs made with high volumes of class F fly ash. In this study eight fly ash self compacting concretes of various strength grades were designed at desired fly ash percentages of 0, 10, 30, 50, 70 and 85%, and were compared with five different mixtures of normal vibrated concrete (NC). Tests were carried out on all mixtures to obtain the properties of fresh concretes in terms of viscosity and stability. The mechanical properties of hardened concretes such as compressive strength, split tensile strength and elastic modulus were also determined. The relative amounts of paste caused differences in the properties of the two types of concrete.
Test results indicated that the use of high volumes of class F fly ash in self compacting concretes decreased the 28 day compressive strength. However, the strength results showed continuous and significant improvement at the ages of 90 and 180 days, which was most probably due to the pozzolanic reaction of fly ash. Self compacting fly ash concretes exhibited higher split tensile strengths and lower elastic modulus compared to normal vibrated concretes.

Online publication: 2009-06-16
Publication type : full_text
Public price (Euros): 0.00