混凝土流变仪的比较

L. Brower, C. Ferraris
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引用次数: 91

摘要

本文描述了新混凝土是一种复杂的流体,由大量水的悬浮液和高体积百分比的颗粒固体组成,颗粒尺寸分布非常广。新拌混凝土的流变特性控制着材料在搅拌、浇筑、固结和整理过程中的流动行为。使用单一参数(如坍落度)测量流量的测试方法不能在所有用途中正确评估混凝土的流变特性。本文描述了美国混凝土协会(ACI) 236A委员会如何在混凝土研究委员会和行业的支持下,测试了四种混凝土流变仪,这些流变仪专门用于评估混凝土材料的流变特性。第二个测试系列扩展了第一个测试系列的数据,使用相同的方法将流变仪放在一个共同的测试地点,同时测试相同的混凝土混合物。所有流变仪都可以测量坍落度在100毫米到250毫米范围内的新混凝土的流动曲线,或坍落度在300毫米到800毫米范围内的非离析混凝土的流动曲线。每个流变仪通过拟合宾厄姆模型流动曲线来测量每种混合物的转速和扭矩,从而评估屈服应力和塑性粘度。所有流变仪给出的屈服应力和塑性粘度的宾厄姆常数的绝对值都不同。但是所有的流变仪对混合物的屈服应力和塑性粘度的排序都是一样的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparison of Concrete Rheometers
This paper describes how fresh concrete is a complex fluid consisting of a suspension of a high volume of water with high volume percentage of particulate solid that has a very wide particle size distribution. The rheological properties of fresh concrete control the flow behavior of the material in mixing, placement, consolidation and finishing. Test methods that measure flow using a single parameter (e.g. slump) cannot properly evaluate the rheological properties of concrete in all uses. The paper describes how the American Concrete Institute (ACI) committee 236A, with the support of the Concrete Research Council and industry, has tested four concrete rheometers that were specifically designed to evaluate rheological properties of concrete materials. The second test series expands the data from the first test series using the same approach of bringing the rheometers together at a common test site and testing the same concrete mixtures simultaneously. All of the rheometers can measure a flow curve for fresh concretes with slumps in the range from 100 mm to 250 mm or non-segregating concretes with slump flows in the range from 300 mm to 800 mm. Each rheometer evaluates yield stress and plastic viscosity by fitting a Bingham model flow curve to measurements of rotation rate and torque for each mix. All of the rheometers gave different absolute values for the Bingham constants of yield stress and plastic viscosity for each mix. But all of the rheometers ranked the mixes in the same order for both yield stress and plastic viscosity.
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