INFLUENCE OF AIR CONTENT ON THE STEADY STATE RHEOLOGICAL PROPERTIES OF FRESH SELF-COMPACTING CONCRETE, WITHOUT AIR ENTRAINING AGENTS
In literature, the variation of the steady state rheological properties, especially yield stress and viscosity due to changes in several elements in the concrete mix proportions is well described. One particular item, namely the air content in concrete is difficult to control without the aid of air entraining agents (AEA). Most results obtained for the variation of rheological properties with air can be influenced by the surfactants present in the AEA.This paper describes the variation of yield stress and plastic viscosity of different SCC mixes without AEA. These concretes have different air contents, influenced by pumping. A physical model has been developed, based on the capillary number, which is the ratio of the shear stresses to the surface tension stresses. The validity of this model has been verified by means of the experiments, showing, with increasing air content, an increase in flow resistance at low shear rates and a decrease in flow resistance at high shear rates.
Dimitri Feys Roussel Nicolas Ronny Verhoeven Geert De Schutter
Magnel Laboratory for Concrete Research,Department of Structural Engineering,Faculty of Engineering, UniversitéParis Est, Laboratoire Central des Ponts et Chaussées, Paris, France Hydraulics Laboratory,Department of Civil Engineering, Faculty of Engineering,Ghent University, Belg Magnel Laboratory for Concrete Research,Department of Structural Engineering,Faculty of Engineering,
国际会议
长沙
英文
287-295
2009-06-05（万方平台首次上网日期，不代表论文的发表时间）