Comparisons
Pressed vs Precast Concrete Drain Slabs
Technical comparison covering performance, manufacturing, durability, installation and other relevant criteria for pressed vs precast concrete drain slabs.
| Criteria | PRESSED CONCRETE DRAIN SLAB | PRECAST CONCRETE DRAIN SLAB |
|---|---|---|
| Mfg. Process | Produced in U.K. make, 300/400 Tons Hydraulic Press with Vacuum Dewatering system | Produced in a steel mould of 2mm thickness by pouring concrete into it followed by vibration. |
| Reinforcement | Can be provided | Can be provided |
| Thickness Variation | +/- 2 mm | +/- 5 mm |
| Appearance | Very good, aesthetically superior appearance with optional pimple finish | Comparatively poor finish |
| Corner Chipping | Almost no corner chipping due to superior manufacturing process | Very high corner chipping due to manual casting process |
| Compressive Strength | High compressive strength of 50MPa without voids/pinholes due to hydraulic pressing with vacuum dewatering | Presence of voids and pinholes limits compressive strength to 30 MPa. |
| Density | 2200-2300 kg/cu.m. | < 2100 kg/cu.m. |
| Labour | Manufacturing process, including material dosing, pressing, and lifting, is fully automatic, requiring no manual labour | Production process is completely manual including mould filling, stripping and product lifting, requiring significant manual labour |
| Production Output | Automated process allows production of more than 300 pcs/day | Manual process and individual moulds limits production to 40 pcs/day |
