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• Superior plasticity and workability
• Far less water penetration (100-200% reduction)
• Higher bond strength (176% higher than cement mortars)
• Increased weatherability and durability
• Increased flexibility
• Increased sand capacity thus reducing costs
• Adequate compressive strength
• Less efflorescence
• Autogenous healing (self healing of tiny cracks)
The mixes recommended are suitable for most purposes.
| |
Cement |
Lime |
Sand |
| Normal Construction |
1 |
2 |
8 - 9 |
| Severe Conditions (below D.P.C) |
1 |
1 |
5 - 6 |
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Lime / cement renders and wet and dry dashing enhance the appearance of buildings. Such finishes are long lasting, less costly and weatherproof.
Qualities exhibited by lime/cement renders include:
• Good bond between render and background
• Flexibility which accommodates building movements
• Steady continuous increase in strength
• Autogenous healing
• Excellent workability and plasticity
Some recommended mixes for External Rendering include:
| |
Cement |
Lime |
Sand |
| Severe Exposure |
1 |
1 |
6 |
| Moderate Exposure |
1 |
2 |
8 - 9 |
| Wet Dash |
4 |
1 |
12 |
| Dry Dash |
2 |
1 |
8 |
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Chemical lime is increasingly being used to modify and stabilise soil beneath road and construction projects. Soils containing clay mineral components are eminently suitable for reaction with lime.
Soil modification effects are immediately visible after lime addition.
• Reduction in plasticity
• Moisture-density relationships change
• Visible textural and strength changes
Stabilisation occurs as a result of ongoing pozzolanic and carbonation reactions with temperature controlling the rate of the pozzolanic reaction. Lime reacts with soil minerals to form cement like calcium silicate and calcium aluminate compounds, which are responsible for substantial increases in strength and durability.
Benefits:
• Reduced excavation costs
• No landfilling of subsoil
• Reduced importing of stone
• Provides a hardened capping layer to underlying material
• Provides a frost resistant sub-base
• Continuous increase of strength properties
• Continuous increase in CBR (Californian Bearing Ratio)
and durability
• Much quicker than alternatives
:: Report on Soil Stabilisation
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Work on construction sites is often behind schedule due to machinery bogging down in mud resulting in lost time and money.
Solution: Chemical lime in either the calcium oxide or calcium hydroxide form will dry up wet soil quickly, is easily compacted and provides a firm working table that resists further wetting.
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Calcium hydroxide chemical lime is added as an important constituent to Porous and Hot Mix Asphalts.
Benefits:
• Increases the resistance to water stripping
• Acts as a mineral filler
• Increases the viscosity, stiffness, tensile strength
and compressive strength
• Increased durability due to combination of previous benefits
• Reduces the oxidation of the binder thus preventing
premature failure
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