APPLICATION STUDY OF VISCOSITY REDUCING TYPE SUPERPLASTICIZERS FOR LOW WATER-BINDER RATIO CONCRETE

摘要

In low water/binder ratio concrete such as high-strength concrete (HSC) or self compacting concrete (SCC), concrete workability, especially pumpability and finishability,decreases due to high viscosity caused by its mixture components and proportion. It is considered that reduction of concrete viscosity is significantly advantageous for placement or construction of HSC/SCC. Therefore, we try to apply viscosity reducing type superplasticizer to low water-binder ratio concrete. As the results, it is found that the newly developed superplasticizers can reduce the viscosity of cement paste in concrete, and the time to achieve 50cm slump-flow, an index of concrete workability can be reduced. Accordingly, it is confirmed that application of the viscosity reducing type superplasticizers is efficacious in workability improvement of low water/binder ratio concrete.