KingAdd 25UW®
Anti-washout concrete admixture.
SpecWorld has the Spec Pack, CSI specification and drawings for registered specifiers.
Overview
KingAdd 25UW is an under-water concrete admixture that increases concrete cohesion and minimizes washout, allowing for concrete to be placed under water.
Where to use
KingAdd 25UW is suitable for:
- Underwater concreting.
- Fluid grouting that may have subject to washout.
Why use it
KingAdd 25UW has the following properties:
- Minimizes washout of cement and fine particles.
- Reduces of concrete bleeding.
- Reduces in segregation.
- Allows longer transport and placing time.
- Helps produce high quality well compacted concrete under water.
COMPATIBILITY
KingAdd 25UW is compatible with all types of cements and cement replacement materials. Using of KingAdd 25UW with other types of admixture should be under control. If there is a need to use another types of admixture in the mix, contact our Technical Department for advice.
Technical properties
| Colour | White fine powder |
|---|---|
| Chloride content BS5075 | Nil |
| Bulk density | 550 – 600 kg/ m³ |
| Air entrainment | Typically less than 2% additional air is entrained above control mix at normal dosages |
DOSAGE
KingAdd 25UW has a range of 0.6 - 0.8% by weight of cement. Dosage outside the typical range quoted above can be used to meet particular requirements.
Washout Resistance
Using KingAdd 25UW, cement washout is expected to be reduced to about 20% of the same mix without KingAdd 25UW. Washout is determined by CRD-C61 test method for determination the resistance of freshly mixed concrete.
Concrete Placement
Concrete containing KingAdd 25UW can be pumped easily or tremied into place. Placement of concrete should be continuous to avoid the free fall of the concrete through water during placement.
| Ordinary Portland Cement (OPC): 20 mm Aggregate: 10 mm Aggregate: Fine Sand: | 380 kg/ m³ | |
|---|---|---|
| Ordinary Portland Cement (OPC) 20 mm Aggregate 10 mm Aggregate Fine Sand | 750 kg/ m³ | |
| Ordinary Portland Cement (OPC) 20 mm Aggregate 10 mm Aggregate Fine Sand | 370 kg/ m³ | |
| Ordinary Portland Cement (OPC) 20 mm Aggregate 10 mm Aggregate Fine Sand | 675 kg/ m³ | |
| Dosage of KingAdd 25UW % by weight of cementitious | Control 0% | 0.7 |
| W/C | 0.44 | 0.45 |
| Slump | 200 mm | 220 mm |
| Washout | 30% | 7% |
| Compressive strength | @ 1 day 17 MPa @ 7 days 45MPa @ 28 days 52 MPa | 12 MPa 40 MPa 49 MPa |
How to use
Method of use
Suggested Mix Proportions
- Sand content 45 – 55% of the total aggregate weight.
- A minimum of 360 kg of cementitious material per m³ should be used.
- A W/C ratio 0.45 or below is recommended.
Method of Adding
KingAdd 25UW should be added after all the concreting ingredients have been batched and thoroughly mixed at the transit mixer. KingAdd 25UW can be added either at the batch plant or the job site. The transit mixer should be mixed for 5 – 10 minutes at high speed.
Cleaning
Spillages of KingAdd 25UW will get when in contact with moisture and should therefore be removed in the dry state.
Coverage, packaging and storage
Packaging
KingAdd 25UW is available in 6 kg bags supply.
Storage
Shelf life is 1 year when stored under cover, out of direct sunlight and protected from extremes of temperature.
Failure to comply with the recommended storage conditions may result in premature deterioration of the product or packaging. For specific storage advice consult KingKrete's Technical Services Department.
Health and safety
As with all chemical products, care should be taken during use and storage to avoid contact with eyes, mouth, skin and foodstuffs. Treat splashes to eyes and skin immediately. If accidentally ingested, seek medical attention. Reseal containers after use. Use in well ventilated areas and avoid inhalation.