setting retarder

VZ2
SETTING RETARDER
PROPERTIES
VZ 2 slows down the reaction between cement and water, which weakens the
frictional forces between the cement and the aggregates.
Depending on the quantity of VZ 2 used, the workability time can be changed as required.
The release of heat is slower, reducing the risk of temperature-related cracking.
The plasticising effect makes the concrete easier to work and produces waterproof concrete
with a very compact structure.
The improved structure and retardant effect increase the final strength.
The concrete containing the retarder weeps for a long period and shrinkage should be
monitored to avoid any cracking.
APPLICATIONS
Restart joints caused by voluntary or involuntary interruptions can be avoided.
The concrete can still be worked and compacted for an extended time after pouring.
VZ 2 is particularly suitable for the fabrication of large items, for concrete transported over
long distances and for concreting work in hot weather.
When using concrete containing the retarder, it is advisable to ensure the availability on the
site of machinery for subsequently compacting the surface (vibrators and spreaders), in order
that any shrinkage cracking can be eliminated as soon as it occurs.
CHARACTERISTICS
Appearance
Solubility
Density
Chlorine ion content
Storage
Pale red liquid
Soluble in water
1.13 kg/dm³
< 0.1%
Protect from frost, sunlight and contamination.
In the case of bulk deliveries, it is essential to use clean, empty
containers.
Durability
Approximately 1 year in closed cans
Physiological effects
Causes slight irritation
Precautions
Wear gloves when handling the product
Values of end of setting time obtained using standard mortar with AFNOR January 1996
reference cements
CEMENTS
Temperatures
Without additives
With additives
VZ2
CPA CEM I 52.5 PMES CP2
20° C
4h 05
8h 25
CPJ CEMII B 32.5 R
5° C
20° C
5° C
11h 20
5h 45
12h 20
22h 10
9h 45
24h 10
concentration = 0.3 % of weight of cement
Before the product is used, testing should be undertaken which takes site conditions into
account (duration of transport, temperature)
It is advisable to verify the strength of retarded concrete.
CONCENTRATION
Range of effectiveness depending on the retardant effect required:
2.0 – 7.0 ml per kg of cement
i.e. approximately
0.2 - 0.7 % of weight of cement
Under normal conditions, 1 ml of VZ 2 in 1 kg of cement retards setting by one hour.
If Portland or blast-furnace cement is used, the concentration can be reduced.
If quick-setting cement is employed, the concentration should be increased by 0.3 litres per
100 kg of cement.
UTILISATION
The VZ 2 setting retarder should be diluted in the mixing water or incorporated into concrete
which has already been mixed. The retarder must not be added to a dry mixture.
VZ 2 is suitable for use with CPA CEMI 52.5 PMES CP 2 CPJ CEM II B 32.5 R cements.
This wide range of cement types makes it necessary to carry out suitability testing in order to
verify effectiveness. Do not use with high-alumina cement.
At high concentrations and high concrete temperatures, side-effects may occur with certain
cements (reverse reaction). The plasticising effect disappears after a certain length of time.
After prolonged storage, the product may become pale or brown if it comes into contact with
steel. This has no influence on product performance.
After an extended period of storage, VZ 2 should be shaken before use.
Monitoring: VZ 2 is subject to strict quality control during manufacture.
The product and its manufacturing process are inspected by FMPA Bauwesen, Otto-GrafInstitut, Stuttgart.
PACKAGING
Cans of 220 kg – containers of 1000 kg
Appropriate testing is recommended in order to verify that the use of our products is
compatible with site requirements.
The information provided in the present document is indicative only.
It is based on our knowledge and experience at the present time but does not constitute a
warranty on our part or engage our liability with respect to the use of the products.
For further information, please refer to the Safety Data Sheet.
71240 Varennes-le-Grand • Tél : 03 85 44 22 15 • Fax : 03 85 44 11 03 •
email : [email protected] • http://www.themeroil.com