Highly workable eco-friendly concretes - influence of the constituents on the rheological properties

Author(s): T. Proske, M. Rezvani, S. Hainer, C-A. Graubner
Paper category: Conference
Book title: Rheology and processing of Construction Materials – 7th RILEM International Conference on Self-Compacting Concrete and 1st RILEM International Conference on Rheology and Processing of Construction Materials
Editor(s): Nicolas Roussel and Hela Bessaies-Bey
Print ISBN: 978-2-35158-137-7
e-ISBN: 978-2-35158-138-4
Publisher: RILEM Publications SARL
Pages: 373-380
Total Pages: 8
Language: English

The objectives of the present study are the rheological properties of highly workable eco-friendly concretes with reduced water and cement content. The replacement of water and cement with reactive substitutions and inert fillers with certain finesses leads to a higher packing density of the concrete. The yield stress of the fresh concrete can be limited by the use of high performance superplasticizers and an optimized particle size distribution. However, due to the low water content, Eco-concretes have a significantly higher plastic viscosity compared to conventional concretes. For the application in practice, the viscosity should be limited to an acceptable value. In several test series the influence of the mix proportion on the rheological properties was analyzed. It was observed that for a given water content, replacement of cement with fly ash, normal and ultra-fine limestone powder, and silica fume reduces the plastic viscosity and increases the flow yield stress. Furthermore, it was found that highly flowable eco-friendly concretes with very low cement content (up to 135 kg/m³) can be achieved by an optimized paste volume of about 320 and 360 l/m³ for water-powder ratios of 0.35 and 0.30, respectively.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00