| Title |
Adjustment of Mixture Proportion of the Base Concrete for the Application of Flowing Concrete Method |
| Authors |
Yoon Gi-Won ; Han Min-Cheol |
| Keywords |
Flowing concrete ; Base concrete ; Plain concrete ; Conventional concrete ; Segregation ; Sand to aggregate ratio |
| Abstract |
The objective of this study is to discuss the method of effective mixture correction of the base concrete to prevent material segregation in applying flowing concrete method. Base concrete, plain concrete(slump 8, 10, 12 respectively) and conventional concrete(slump 18cm) are made. Base concrete is flowed to 18cm of slump concrete. According to the results, in order to prevent material segregation and loss of air content after applying flowing concrete method, S/a(sand to aggregate ratio), water content need to be increased when mixture design is performed. As for the properties of fresh concrete, slump, slump flow and air content make no difference before and after flowing. However, after flowing the plain concrete without mixture correction, material segregation happens. The difference of compressive strength is slight before and after applying flowing concrete method. Compressive strength of base concrete decreases slightly due to an increase of air content in comparison with plain concrete. For mixture correction of base concrete, it is found that S/a and water content needs to be increased by 4-5% and 5- 13kg/m^3, respectively to prevent segregation after flowng. |