Micro Concrete Dry Powder
PC Micro Concrete is supplied as a ready to use dry powder which requires only addition of clean water at site to produce a free flowing non shrink repair micro concrete. This is a cementious material, with additives, which impart controlled expansions characteristics in the plastic state while minimizing water demand. This is specially designed for repairs to damaged reinforced concrete elements, particularly where areas is restricted and where vibration of the placed material is difficult or impossible.
Repair to damaged reinforced concrete elements like slabs, beams, columns, wall etc., where access is restricted and compaction is not possible. For Jacketing of RCC columns to increase load taking capacity (strengthening of a vertical member).
- Clean the surface and remove loose concrete, any dust, oil, paint, grease etc.
- Expose fully any corroded steel in the repair area and remove all scale and corrosion deposits. Shot blasting is highly recommended.
- Saturate the substrate with water to prevent absorption of water from the mixed material of PCBOND’S Micro Concrete.
- Dubond’s Micro Concrete with water (3.75 to 4 liters per 25 kg bag) till homogeneous mix is obtained, at 300 C.
- Mixing should be done thoroughly with a forced action mixer of adequate capacity, at least for 5 minutes.
- Pour or pump the mixed PCBOND’S Micro Concrete into a watertight shuttering in the repaired area.
- When primer area becomes tacky.
- Cure the repaired surface for minimum 7 days.
- Clean the surface and remove loose concrete, any dust, oil, paint, grease etc.
- Expose fully any corroded steel in the repair area and remove all scale and corrosion deposits. Shot blasting is highly recommended
- Saturate the substrate with water to prevent absorption of water from the mixed material of PCBOND’S Micro Concrete
- Dubond’s Micro Concrete with water (3.75 to 4 liters per 25 kg bag) till homogeneous mix is obtained, at 30 C
- Mixing should be done thoroughly with a forced action mixer of adequate capacity, at least for 5 minutes.
- Pour or pump the mixed PCBOND’S Micro Concrete into a watertight shuttering in the repaired area,
- when primer area becomes tacky.
- Cure the repaired surface for minimum 7 days.
| Compressive strength | 100 kg/cm2 at 1 day, 300 kg/cm2 at 3 days, 400 kg/cm2 at 7 days, 500 kg/cm2 at 28 days |
| Flexural strength days | 50 kg/cm2 at 28 days |
| % water absorption after 24 hrs | 0.45 |
| Chloride content | NIL |
| Depth of carbonation, mm | Passes the accelerated carbonation test |
| 2 Hours | NIL |
| 4 Hours | NIL |
| Coefficient of thermal expansion | 10-12 X10 / C |
| Yield | 13.5 liters |
| Coverage | 1.3 m per 25 kg packet 10 mm thickness |