Experimental Study On Mixing Ratio of Concrete Adding Fly Ash and Slag Powder

摘要

13 Groups of C20 concrete specimens and 11 groups of C60 concrete specimens adding different content of fly ash and slag powder, comparing with normal concrete specimens, were tested to analyze co.mpressive strength and workability. The test results show: When adding fly ash only, equivalent replacing volume should not exceed 30%, and for lower strength concretes (such as C20) the adding volume should be lower than 30%, otherwise, the compressive strength was influenced greatly. When adding slag powder only, the replacing volume should increase to 40%, meanwhile the workability must be supervised. When adding fly ash and slag powder simultaneously, the adding volume should reach to 50%, and the ratio of fly ash to slag should be controlled. For C20 concrete the ratio of fly ash to slag powder should not exceed 10% and for C60 concrete the ratio should reach to 25%.