| Summary: | 碩士 === 國立中興大學 === 土木工程學系 === 90 === Pozzolanic materials are often added into the process of high performance concrete (HPC). Slag is a by-product of iron-smelting in the blast furnace, and has stable chemical components and pozzolanic properties. This research intends to investigate the effect of slag on the flowability of flowable concrete.The water-binder ratio of concrete was slected as 0.4,0.5 and 0.6. The substitute ratio of slag in cement was the only variable, and designed to be 0, 10, 20, 30, 40 and 60%. By experiment the rheology test was adopted as major method to determine the workability of fresh concrete, while the slump test, V-funnel test, L-funnel test, were also conducted for comparison.
Test results show that the effects of slag on workability are different for concrete with different water-cementitious ratio. The concrete of higher water-binder ratio can content more water that provide all components of concrete sufficient water for smoothening, while the slag will enhance the proper viscosities in concrete thus produce positive assist for the workability of concrete. The concrete containing more slag for lower water-binder ratio will make the paste more adhesive, where Free water will not be sufficient to smoothen the surface of aggregate in concrete. This results in a concrete too dry and unflowable. As to the substitute ratio of slag, it is recommended to be 30% for concrete with 0.4 water-binder ratio, and 20% for concrete with water-binder ratio of 0.5 and 0.6 respectitively.
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