LDA - The Product
LDA is a variant of Light Weight Aggregate (LWA). Fly ash based LDA is a suitable and proven replacement of natural coarse aggregate in concrete. Low Density Aggregate produced at IMFA comes in sizes of 4-8 mm and 8-14/16 mm. LDA can be used for structural concrete, precast concrete, concrete screeds and all types of masonry work. It is suitable for construction of structural fill, walls, floors, roofs, arrestor beds, bridges and multi-dwelling units.
Properties - LDA vs Natural aggregate:
| Properties | LDA | Natural Aggregate |
| Bulk Density | 750-900kg/cum | 1450-1750 kg/cum |
| Water Absorption | 12% - 16% | 0.5% - 1.5% |
| Specific Gravity | 1.45 – 1.65 | 2.75 – 2.95 |
| LOI of Product | < 4% | < 4% |
| Weight of Concrete | 1800 – 1900 kg/cum | 2400-2550 kg/cum |
| Shape | Round | Angular |
Advantages:
- Lower dead weight of concrete by 20 % - 25 %.
- Reduced reinforcement in concrete due to lower dead weight.
- Low shrinkage reduces micro cracks in concrete
- Higher Thermal insulation
- Easily pumpable