USE OF RHEOGRAPHS TO ANALYSE FRESH STATE BEHAVIOR OF SELF COMPACTING RECYCLED CONCRETE

Author(s): Iris González-Taboada, Belén González-Fonteboa, Fernando Martínez-Abella, Sindy Seara-Paz
Paper category: Proceedings
Book title: IV International Conference Progress of Recycling in the Built Environment
Editor(s): Isabel M. Martins, Carina Ulsen, Yury Villagran
ISBN:
e-ISBN: 978-2-35158-208-4
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 108-115
Total Pages: 08
Language : English

Abstract: A rheograph is a plastic viscosity – yield stress diagram that reveals in a systematic way the
effects of diverse changes in the constituents on the rheological behaviour of the cement-based
suspension. In this work, fresh state behaviour of self-compacting recycled concrete is analysed
using different rheographs.
Four types of self-compacting concretes were designed: a reference concrete and three recycled
concretes with different percentages of recycled coarse aggregate (20%, 50% and 100% by
volume). They were produced adding extra water to compensate recycled aggregate water
absorption. Then all mixes were modified increasing and decreasing the cement, water and
superplasticizer content to finally work with 28 mixes.
Fresh-state properties of all mixes were measured with rheological tests, carried out at 15, 45
and 90 min from the water-cement contact. The results obtained were used to build different
rheographs that explain the effects of time, recycled aggregate incorporation, cement variation,
water variations and superplasticizer variations on the fresh state of the mixes.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00