Autoclave used as steam curing process which high pressure (130psi) and high temperature (175oC) for 4 hours; to improve the LRC product physical characteristics and achieve early strength. The Autoclaving process changes the cement based product to a crystalline structure much stronger and more stable, further to expedite in delivery time compares to other conventional lightweight concrete technology products.
LRC products are non-combustible when used as surface decoration material with a flame-spread index of zero. It has achieved 3 hours fire rating test. (SIRIM. BS 476. parts 4)
TYPICAL PROPERTIES (At 28 days)
Property For Autoclave Cure
- Bending: 5 - 8 Mpa
- Shear Strength: 2 - 3 Mpa
- Compressive Strength : 10 -15 Mpa
- Impact Strength: 6 - 12 KJ/m2
- Elastic Modules : 10 – 20 Gpa
- Strain Failure : 1-2%
- Dry Density : 1000 –1200 kg/m3
- Fire Resistance : 3 hours
- Water Absorption : 0.003ml/m2/sec
- M.O.R : 19 Mpa
- Freeze Thaw (50 cycles) : No deterioration
Property For Air Cure
- Bending : 2 - 4 Mpa
- Shear Strength : 1.5 - 2.5 Mpa
- Compressive Strength : 8 -10 Mpa
- Impact Strength : 5 - 10 KJ/m2
- Elastic Modules : 10 – 20 Gpa
- Strain Failure : 1-2 %
- Dry Density : 1200 –1300 kg/m3
- Fire Resistance : 3 hours
- Water Absorption : 0.003 ml/m2/sec.
- M.O.R : 15 Mpa
- Freeze Thaw (50 cycles) : No deterioration
CEMENT 
The cement shall be Ordinary Portland Cement to BS 12 “Specification for Ordinary Portland Cement”. Fly ash is from coal burning (waste ash) which from coal burning power station and blended with cement.
SAND
Sand shall be washed river fine sand or dried silica sand free from soluble salts, clay particles and organic matter. The suitable composition is 90~95% silica, 2% maximum moisture, 1% maximum soluble salts, 0.5% maximum clay and organic material.
CELLULOSE FIBER
The cellulose fiber (waste paper pulp) shall be clean and free of lignin-based impurities with at least 20% of the fiber over 100mm square. The cellulose fiber or wood fiber which from waste paper (recycle paper) and it is serves a purpose similar to the reinforcing in reinforced concrete.
POLYSTYRENE CHIP
The polystyrene beads or chips (recycle from polystyrene foam waste) shall be clean and CFC free. Mainly to added in the lightweight concrete is to reducing the density and achieved a constant density require in the concrete. However it gives a very good thermal insulation if apply to wall panel.
WATER
The water shall be clean and free from deleterious matter. In general, water suitable for drinking should be adequate. Where tests are required, they shall be done in accordance with the requirements of BS 3128 “Methods of Test for Water for Making Concrete.”
