INFLUENCE OF AIR CONTENT ON THE STEADY STATE RHEOLOGICAL PROPERTIES OF FRESH SELF-COMPACTING CONCRETE, WITHOUT AIR ENTRAINING AGENTS

机译：空气含量对无自吸剂的新鲜自填充混凝土稳态流变性能的影响

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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.

机译：在文献中，已经很好地描述了由于混凝土配合比中几种元素的变化而引起的稳态流变性能的变化，特别是屈服应力和粘度的变化。如果没有空气夹带剂（AEA），则很难控制一个具体项目，即混凝土中的空气含量。 AEA中存在的表面活性剂会影响大多数与空气的流变性能变化有关的结果。本文介绍了不使用AEA的不同SCC混合物的屈服应力和塑性粘度的变化。这些混凝土的空气含量不同，受泵送影响。基于毛细管数，已开发出物理模型，该模型是剪切应力与表面张力应力之比。通过实验验证了该模型的有效性，表明随着空气含量的增加，低剪切速率下的流阻增加，而高剪切速率下的流阻下降。

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《第二届自密实混凝土设计、性能及应用技术国际研讨会(2nd International Symposium on Design,Performance and Use of Self-Consolidating Concrete SCC'2009-China)》|2009年|287-295|共9页
会议地点 Beijing(CN)
作者
Dimitri Feys; Roussel Nicolas; Ronny Verhoeven; Geert De Schutter;
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Magnel Laboratory for Concrete Research,Department of Structural Engineering,Faculty of Engineering,Ghent University, Belgium Hydraulics Laboratory, Department of Civil Engineering, Faculty of Engineering, Ghent University, Belgium;

UniversitéParis Est, Laboratoire Central des Ponts et Chaussées, Paris, France;

Hydraulics Laboratory,Department of Civil Engineering, Faculty of Engineering,Ghent University, Belgium;

Magnel Laboratory for Concrete Research,Department of Structural Engineering,Faculty of Engineering, Ghent University,Belgium;

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INFLUENCE OF AIR CONTENT ON THE STEADY STATE RHEOLOGICAL PROPERTIES OF FRESH SELF-COMPACTING CONCRETE, WITHOUT AIR ENTRAINING AGENTS

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