Waterproof concrete requires several measures to ensure a dense structure.
Cement: VELOSIT CA 113 can be used with most CEM I – III R and N (ASTM Type I – V) cements.
Only cement types with more the 50 % pozzolanic content are not suitable.
Cement content must be at least 280 kg/m3 (472 lbs. per yd3).
Fly ash: Total fly ash must be less than 50 % of the cement content.
Water: potable water quality with a maximum dosage of 55 % on cement content (water/cement ratio < 0.55).
Pozzolans: Pozzolanic additives like Microsilica or slag should be avoided as they compete with VELOSIT CA 113 for the available lime.
Aggragates and sand: Ensure a proper sieve curve according to good concreting practice as outlined for example in the ACI guidelines.
Admixtures: VELOSIT CA 113 is compatible with most concrete admixtures.
For compatibility of VELOSIT CA 113 trial mixes are strongly recommended.
Rebar: Amount and layout of reinforcement must be planned to minimize the risk of crack development.
The rebar design is not influenced by the use of VELOSIT CA 113.
2.) Processing
The dosage depends on the amount of mixing water including aggregate moisture in the batch mix. Add 2.5 % VELOSIT CA 113, i.e. 2.5 kg per 100 liter (2.1 lbs. per 10 gal.).
In a typical 300 kg cement per m3 (505 lbs. per yd3) with a water/cement ratio of 0.40 this equals a dosage of 1.0% on cement.
a.) Batch-plant: Add VELOSIT CA 113 together with the aggregates. Use normal mixing procedure.
b.) Concrete truck: Add VELOSIT CA 113 into the drum when the truck arrives at the job site. Mix for 8 min. at high speed before pumping. Trial mixes with the concrete mix design are strongly recommended for this application.
c.) Site mixes: Concrete mixed in small tumbler mixers can also be improved with VELOSIT CA 113.
As the mixing intensity is lower, we recommend producing a slurry of VELOSIT CA 113 with 100 – 200 % water to ensure proper mixing results.
3.) Placing Concrete can be placed as specified. Take special care of the compaction by properly vibrating the placed concrete. Install joint waterproofing solutions for example VELOSIT WS 801 in any cold joints or construction joints.
4.) Curing Follow standard curing procedures for the site conditions. Take the required steps by either water curing as specified or applying a curing compound.
Cleaning VELOSIT CA 113 can be removed in the fresh state with water. Once it has cured acidic cleaners like muriatic acid are required.
Packaging VELOSIT CA 113 is available in 20 kg (44 lb.) watertight plastic bags.
Storage VELOSIT CA 113 can be stored in unopened original packs for 12 months at 5–35 °C (40–95°F) in a dry storage place protected against sunlight.
Safety Please observe the actual valid material safety data sheet and follow the described safety measures for
handling of the product. Used product containers must be emptied completely after use.
Recommendations VELOSIT CW 113 is only available for professional applicators. Concrete treated with VELOSIT CA 113 may discolor or show strong efflorescence in water contact.
This is normal and caused by the crystalline reaction.
All described product features are determined under controlled laboratory conditions according to the relevant international standards. Values determined under job site conditions may deviate from the stated values
