Properties:
1. Dry-shrinkage ratio is less than 0.04%.
Portland cement concrete has long hardening time, and so dry shrinkage is very low. If the shrinkage rate of repair material is too high, the original concrete and the CSA repair concrete may have different load-bearing capacity which cause hollowing or split-off. After decades of delving, finally we find the most suitable mix proportion to get a talent concrete repair material which can develop a micro expansion and low shrinkage. These properties can make the repair material combined with the original concrete surface strongly; most of concrete repair materials in market currently can not reach.
2. Bond Strength ≥1.5Mpa.
Only the original concrete and repair material have solid combination, the concrete repair can achieve the perfect effect. This requires repair materials have higher tensile bond strength. The addition of polymers certainly ensures this purpose, meanwhile improving the flexibility of the repair material.
3. Avoid cracking, falling off and breaking.
4. Freeze resistance, impermeability, good corrosion resistance.
Scientific ternary system let our repair material have a micro expansion, low water ratio, the addition of polymer improve the density of the repair material and antifreeze, impermeability and corrosion resistance properties.
5. Polymers and the addition of quartz sand used as aggregate material greatly improves the wear resistance of repair materials.
6. High early strength.
Its compressive strength can reach 3.5Mpa within 6h, 35~50Mpa after 28days.
7. Easy to use.
The maximum diameter of aggregate in repair material is below 1.5mm; fully apply to all kinds of thin patch. According to the patching thickness, 1.5~25mm size aggregate can be added as well to increase the strength of repair material.
8. High performance and competitive price.
Using of CSA Concrete Repair Material
Surface Preparation:
Where bonding is important, the adjacent surfaces shall be clean, sound and free from any materials that may inhibit bond such as oil, asphalt, curing compounds, acids, dirt and loose debris. Roughen surfaces and remove all unsound concrete. Moisten the surface well but keep no residue water left when repair works begin. Don’t coat any interface agent on the base surface.
Mixing:
The use of a power driven mechanical mixer, such as a mortar mixer or a drill mounted mixer, is recommended. Organize work so that all personnel and equipment are in place before mixing. Use clean Potable water. This material should be strictly mixed according to instruction of specified mixed water/material ratio with blender, no hand mixing, and the mixed slurry should be used in 40 minutes.
Placement:
CSA Concrete Repair Material may be placed using traditional methods. Organize work so that all personnel and equipment are ready before placement. Place, consolidate and screed quickly to allow for maximum finishing time. Do NOT wait for bleed water, apply final finish as soon as possible. CSA Concrete Repair Material may be troweled, floated or broom finished. On flat work, install CSA Concrete repair material in layers,DO NOT install full depth sections and progress horizontally. Do NOT install on frozen surfaces. Use a method of consolidation that eliminates air voids. To extend working time, retarding admixture can be applied.
Temperature:
Warm environmental and materials temperatures will reduce the working time of CSA Concrete Repair Material Mix. To compensate for warm temperatures, keep material cool and use chilled mix water. Temperatures below 20ºC will decrease the rate of strength gain and CSA Concrete Repair Material Mix should not be applied if surface or ambient temperature is below 5ºC.
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