In Limonite-bound conventional placement, high density concrete reaches a density of about 2960 kg/m³. To avoid segregation arising from the heavy aggregate, the unit recommends:

1. The mass difference between heavy aggregate and paste promotes segregation under vibration. 2. The unit advises the pre-placed aggregate method to avoid this segregation. 3. In this method coarse heavy aggregate is placed first, then grout is injected through it. 4. The grout used for high density concrete must be richer than in normal pre-placed concrete. 5. Raising W/C, adding water or replacing sand would worsen segregation, not control it. _Source: IGNOU Concrete Technology, Unit 11 "Special Concrete" (Light Weight, Aerated, No-Fines, High Density, Fibre Reinforced, Polymer Concrete)._