Rheology as Tool to Improve Concrete Quality
Increased use of chemical admixtures in concrete and development in cement properties demands augmented knowledge on the rheological properties such as yield value and plastic viscosity for successful application of the product. This knowledge can even be essential for the quality of high performance concrete such as high strength concrete and in particular self compacting concrete. For determination of these properties, rheology is a key tool as the traditional empirical test methods like slump come short. To evaluate the rheological properties of fresh concrete, a coaxial cylinder viscometer can be used. Application and benefits of rheology as a tool in evaluating the properties of fresh concrete, in particular self-compacting concrete, are briefly discussed. Several examples are shown concerning effects of shift in parameters such as increased water content, air content, silica fume content and different dispersing admixtures. Further some practical examples of mix-design through use of rheology as a designing tool are given. A rheograph can inform (scientifically) where one is located regarding the properties of the fresh concrete, where to go to optimize them and how to get there. Often the alternative is just based on feeling.
rheology fresh concrete workability yield value plastic viscosity self-compacting concrete, SCC
O.H. Wallevik
ICI Rheocenter, Reykjavik University, Innovation Center Iceland
国际会议
济南
英文
1192-1202
2010-05-09（万方平台首次上网日期，不代表论文的发表时间）