Description
POZZOLITH LD20 is a versatile product which can be utilised to maintain workability and effect water reduction throughout a range of concrete mix designs and ambient temperature conditions.
POZZOLITH LD20 is a multi-role admixture capable of functioning as a water reducer to enable strength gains, whilst maintaining workability or set retardation.
Primary uses
- Hot weather concreting.
- To increase workability.
- To increase compressive strength.
- To reduce permeability.
Typical applications
POZZOLITH LD20 is used wherever effective workability retention and maximum strengths are required such as:
- Hot weather concreting where controlled delays to initial set are beneficial.
- Readymix concrete where workability retention coupled with retardation of initial set are beneficial.
- In areas of congested reinforcement where high workability is of benefit.
- Above or below ground waterproofing where maximum impermeability and watertightness are essential.
Advantages
- Reduces placing problems in hot weather concreting by improving workability and workability retention.
- Increases impermeability and durability.
- Higher early and ultimate strengths.
- Effective over wide range of cement contents.
- Improves surface finish, pumpability and trowelling.
- Enables significant economies in mix designs to be achieved, thereby saving cement.
Packaging
POZZOLITH LD20 is available in bulk or in 210 litre drums.
Compatibility
POZZOLITH LD20 can be used with all types of Portland cement including Sulphate Resisting and modified cement (Type II). For use with special cements, contact BASF's Technical Services Department.
POZZOLITH LD20 should not be mixed with other admixtures. If other admixtures are to be used in concrete containing POZZOLITH LD20, they must be dispensed separately. Consult BASF's Technical Services Department for advice.
Action
POZZOLITH LD20 acts efficiently on the cement particles by combining the effects of powerful plasticising and deflocculating agents.
It considerably improves the workability of concrete mixes without the addition of extra water. The improved dispersal of the cement particles ensures the process of hydration proceeds under optimum conditions.
Typical properties
| Colour: |
Dark brown/black liquid |
| Specific gravity: |
1.194 at 25°C |
| Air entrainment: |
1-2% dependent on dosage. |
| Chloride content: |
Nil to BS 5075 |
| Nitrate content |
Nil |
| Freezing point: |
2°C. Can be reconstituted if stirred after leaving to thaw. |
| Flashpoint: |
None |
Standards
ASTM C-494: Types A, B and D
BS 5075: Part 1
Directions for use
POZZOLITH LD20 should be added to the mix with the gauging water after sand, cement, and aggregate have been blended. Alternatively POZZOLITH LD20 can be dispensed after the water has been added to the blended cement and aggregates.
Dosage
The normal dosage range is 280ml to 900ml per 100kg of cement. Higher dosages may be required when certain combinations of materials and conditions are present.
In all cases we recommend trial mixes are carried out to determine the correct levels of admixture required to achieve the desired concrete properties.
Setting
POZZOLITH LD20 acts efficiently to give controlled retardation of initial set. Setting times of concrete mixes are related to cement type and ambient temperature.
Effects of over dosage
A severe over dosage of POZZOLITH LD20 will result in the following:
- Retardation of initial and final set.
- Slight increase in air entrainment.
- Increase in workability.
Providing it is properly cured, the ultimate strength of the concrete will not be adversely affected and will generally be higher than for normal concrete. The retarding effects of very high dosages will be exaggerated with SR cement.
Dispensing
POZZOLITH LD20 should be dispensed through a proprietary dispenser, such as is available from BASF. Details available on request.
Storage
Store under cover, out of direct sunlight and protect from extremes of temperature. Shelf life is up to 2 years when stored as above.
Failure to comply with the recommended storage conditions may result in premature deterioration of the product or packaging. For specific storage advice consult BASF's Technical Services Department.
Safety precautions
POZZOLITH LD20 is not a fire or health hazard. Spillages should be washed down immediately with cold water. For further information refer to the material safety data sheet.
Note
Field service, where provided, does not constitute supervisory responsibility. For additional information contact your local BASF representative.
BASF reserves the right to have the true cause of any difficulty determined by accepted test methods