 Products
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Hydracrete-SBR
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Since 1923, the concept of latex-hydraulic cement mix design started. But practically the use of latex modified mortars and concretes started in the 1960s. In almost all developed countries like America, Europe, Japan, and USSR the practical application were started in the 1960s only.
Latex - cement combination in cement mortar and concrete is governed by both the cement mortar and concrete is governed by both the cement hydration and latex polymer film formation processes in their binder phase. In the process, a 'co-matrix' phase is formed by both cement hydration & polymer film formation. The properties of ordinary cement mortar and concrete are generally improved to a great extent by latex modification. In latex modified mortar and concrete , it appears that the micro cracks are bridged by the polymer films or membranes which prevents crack propagation and simultaneously, a strong cement hydrate-aggregate bond is formed. The sealing effect due to polymer film formed in the structure also provides a considerable increase in waterproofness, resistance to chloride ion penetration, moisture transmission, carbonation, oxygen diffusion, chemical resistanceabd freeze-thaw durability.
Benefits
- Easy to mix & use.
- Provides good workability.
- Markedly improved water retention-help in cement hydration.
- Resistance to bleeding and segregationis excellent.
- A noticeable increase in tensile and flexural strength but no improvement in compressive strength.
- The surface hardness of latex modified concrete is improved.
- Provides a higher deformation, ductility and elasticity - modulus of elasticity is smaller (0.001-10 x 104 kgf/Cm2)
- then the conventional concrete (10 - 30 x 104 kgf/cm2)
- The drying shrinkage ma be smaller dependent on latex / cement ratio.
- Latex modified mortar and concrete usually have coefficient of thermal expansion equal to or slightly more than that of conventional concrete.
- Modification reduces water absorption , water permeability, water avapour transmission. improves waterproofness.
- Improved bond strength to various substrates.
- Excellent impact resistance.
- Resistant to alkalies but not resistant to inorganic-organic acids and sulfates.
- The chloride ion permeability is low.
- Improved resistance to freezing & thawing.
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Technical Characteristics:
HYDRACRETE-SBR is a styrene betadiene latex specially developed to use with cement formulations.
| Appearance | Milky white liquid. | | Stabilizer type % solid by wt. | 45± 1 | | Viscosity at 30°C | 35 - 40 cps. | | Specific gravity at 30°C | 1.01 - 1.02 | | PH value | 8 - 9 | | Particle size | 200ym | | Applicatio time | 1 to 1 1/2 hours in of the mixing | | Setting time | 15 - 16 hours. | | Curing time | 28 days. | | Curing method | First 24 hours air day. Moist cure for another 7 days. |
End Uses
Typpical areas of Latex - modified concrete and mortars
| Paving & flooring | General house flooring, warehouses, office, shops, toilet floors, stairs, passages, chemical plant, railway platforms, roads and garages. |
| Water proofing | Roof decks, block walls, water tank, swimming pool, septic tanks & silos. |
| Adhesives(bonding agents) | For boning of heat insulating materials, old and new concrete & mortar & repair of cracks. |
| Anticorrosive lining | Effluent drains, chemical factory floors, grouting of acid proof tiles, septic tanks, foundations for machinery plants etc. |
| Deck coverings | Ship decks, bridge decks & footbridge decks. |
Application The mix proportions of latex modifiers concrete & mortars cannot be easily determined unless otherwise trials are concducted. By our technical date generation we have found the following suitable mix designs.
Shelf Life One year from the date of manufacture.
Storage Store at a cool & dry place, strictly away from sunheat.
Packing5,10,35 litres plastic jars and drum.
| Application | Cement | Sand | Latex | Thickness of trowelling or coating, mm | | Paving & flooring | 01
01 | 03
03 | 0.23-0.3
0.3-0.5 | 05-10
10-15 | | Waterproofing | 01 | 2-3 | 0.3-0.5 | 05-20 | | Adhesive (bonding agent) | 01 | 0-1 | >0.20 | - | | Anticorrosive lining | 01 | 2-3 | 0.4-0.6 | 10-15 | Deck covering.
Under coat:
Mid coat:
Top coat: | -
01
01
01 | -
2-3
03
03 | -
0.9-1.0
0.4-0.6
0.5-0.6 | -
1-2
5-6
3-4 |
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