流变学
骨料(复合)
材料科学
复合材料
分数(化学)
岩土工程
地质学
化学
色谱法
作者
RD Hooton,MR Geiker,M Brandl,LN Thrane,LF Nielsen
出处
期刊:Cement, concrete and aggregates
[ASTM International]
日期:2002-01-01
卷期号:24 (1): 3-3
被引量:92
摘要
Rheological measurements have been undertaken to illustrate the applicability on fresh self-compacting concrete of a model for the relative viscosity and yield stress of suspensions. The model is based on linear viscoelasticity and classical theory for composite materials and it takes into account the amount, shape (aspect ratio of ellipsoids), and maximum packing density of the particles (here aggregates), as well as the rheological properties of the matrix (here mortar). Self-compacting concretes made from different types of coarse aggregates: spheres (glass beads), sea dredged, crushed, and a mix of sea dredged and crushed aggregates, have been tested in a coaxial cylinder concrete rheometer (BML). The investigations indicate that the aspect ratio, angularity, and surface texture of aggregates affect the viscosity and yield stress. The magnitude of these effects depends on the property in question, viscosity and yield stress.
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