WATCHEM RETARD
RETARDING ADMIXTURE |
| DESCRIPTION |
| Watchem RETARD is specially formulated admixture based on sulfonated naphthalene polymer, lignosulfonates and carbohydrates . It is supplied as dark brown colored liquid miscible with water. |
STANDARD
Confirms to IS: 9103:1999 and ASTM –C 494M – 99a,1999 Type B & D as water reducer cum retarding admixture |
SALIENT FEATURES
- Initial set is delayed which makes proper placement and
finishing without development of cold joints in hot weather
concreting possible.
- Lower W / C ratios results in increased compressive, flexural strength , durability and impermeability.
- Controlled temperature rise and hence reduced thermal cracking.
|
APPLICATIONS
- Ready mix concrete,
- High quality concrete where predictable and controlled
setting time is desired,
- Safe for use in pre-stressed and reinforced concrete,
- Flatwork, horizontal and vertical slip form concrete placement,
- Hot weather concreting
- Where delay in transportation or placement is likely to occur
as in case of high rise buildings, chimneys, towers etc.
|
DIRECTIONS FOR USE
Watchem RETARD is added to pre-wetted concrete mix at a rate of 0.3 to 0.5 Lt. per bag of cement. However actual site trials have to be carried out to minimize the optimum dose for the intended application.
The measured quantity of is mixed with part of gauging
water and then added to the mix. For further assistance in optimum dosage trials
and design mix please contact our Technical Service Department.
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TYPICAL ANALYSIS
- Appearance : Dark brown colored liquid
- pH : 7 to 8
- Sp. Gr. @ 30 c : 1.18 ± 0.02
- Chlorides - nil
|
TECHNICAL DATA
The following results were obtained under normal laboratory conditions.
Mix Design : M-20
Cement O.P. - 307 Kg/m³.
Sand Zone II - 38 %
Coarse Aggregate (5-20 mm ) - 62 % |
Admixture |
Test |
Dose
Per 50 kg cement |
W/C Ratio |
slump
(mm ) |
Compressive
strength N/mm2 |
3
days |
7
days |
28
days |
Control |
------ |
------ |
0.58 |
50 |
14 |
16.5 |
23 |
Watchem RETARD |
Strength
increased |
0.300 Ltr. |
0.54 |
54 |
17 |
21.5 |
29 |
Watchem RETARD |
workability
increased |
0.300 Ltr. |
0.58 |
95 |
14 |
17 |
25 |
|
Setting time
(IS:8142: 1999) |
Specification
(IS:9103: 1999) |
Control |
Watchem RETARD |
Initial |
+1 to + 3 Hours |
2 : 30 Hours |
4 : 40 Hours |
Final |
+1 to + 3 Hours |
4 : 20 Hours |
6 : 15 Hours |
|
COMPATIBILITY
Compatible with all types of cement It is also compatible with other WATCHEM’S CONCRETE ADMIXTURES, but should be added separately |
PACKING
Watchem RETARD is available in 1 & 5 Lts. HDPE / 9-16 MT Bulk. |
| |
STORAGE
Watchem RETARD should be stored preferably in shade and in original containers. It has a shelf life of 12 months when stored in cool & dry place. |
HEALTH & SAFETY
Watchem RETARD is non toxic, non - hazardous . Usual precautions like wearing gloves and goggles when handling should followed. Accidental splashes on skin and in eyes should be washed off with plenty of plain water.
If necessary seek medical advice. |
