ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Self-Consolidating Recycled Concrete: Rheological Behavior Over Time

Author(s): I. González-Taboada, B. González-Fonteboa, F. Martínez-Abella, and S. Seara-Paz

Publication: Materials Journal

Volume: 117

Issue: 1

Appears on pages(s): 3-14

Keywords: recycled coarse aggregate; rheographs; rheology; thixotropy; time-dependent evolution; workability loss

Date: 1/1/2020

Abstract:
A rheograph is a plastic viscosity-yield stress diagram that systematically reveals the effects of diverse changes on the rheological behavior of the cement-based suspension. In this work, the time-dependent rheological behavior of self-consolidating recycled concrete (SCRC) and conventional self-consolidating concrete (SCC) was compared and the effect of changes in material quantities was assessed using different rheographs. The developed analysis leads to the conclusion that differences obtained depend on the quantity of water compensated in the mixing protocol to take into account the high absorption of recycled aggregates. This fact determines the region of the curves “rheological variations – effective water to cement ratio” where concretes are designed. The high slope region of these curves will be reached when high percentages of recycled aggregate are used, when SCRC is designed with a low water-cement ratio (w/c), and/or when long-term self-consolidating behavior is measured. In these cases, a different time-dependent rheological behavior is expected from an SCRC than from an SCC; otherwise, the rheological behavior over time of an SCRC will be similar to that of an SCC.




  

Please enter this 5 digit unlock code on the web page.