Improved mix design method of self-compacting concrete based on coarse aggregate average diameter and slump flow

Based on the relations between slump flow (SF), coarse aggregate average diameter (dav,i) and volume of coarse aggregate (Vg,i) used in self-compacting concrete (SCC), it was found that the preferable SF was that coarse aggregate could flow into a compact single layer status when SF testing was taken. Therefore, an improved mix design method of SCC was proposed according to relations among SF, dav,i and Vg,i. In the same Vg,i condition, large dav,i is suitable for small SF, but small dav,i should match large SF. When nominal size of coarse aggregate was 5-20 mm, proper SF for SCC should be 570 mm-720 mm. Results from the validated experiment show that properties of SCC including workability and compressive strength can satisfy the requirements. This improved mix design method helps to further develop SCC and cuts cost in real engineering projects.