CEMWET SP - 3000
HIGH RANGE WATER REDUCING SUPERPLASTICISING ADMIXTURE FOR THE PRODUCTION OF SELF-COMPACTING PLASTIC CONCRETE
DESCRIPTION
The basic components of CEMWET SP-3000 are synthetic polymers which allow mixing water to be reduced considerably and concrete strength to be enhanced significantly, particularly at early ages.
CEMWET SP-3000 is a chloride free product.
PRIMARY USES
- Production of plastic self compacting concrete.
- Precast concrete, Readymix concrete.
- Low water/cement ratio concrete.
- In complicated formwork where reinforcement is conjusted.
ADVANTAGES
CEMWET SP-3000 makes the concrete highly 'owable, with a low water /cement ratio. Table 1 shows some typical examples of reductions in the w/c ratio. The concrete treated with CEMWET SP-3000 shows strengths higher than concrete without admixture having the same workability.
The increase in strength, specially evidently at early ages remains at later ages, both in air cured and steam cured processes. Initial and final sets do not change significantly with respect to concrete without admixture.
Due to the reduction in the water / cement ratio, all the other properties of hardened concrete improve significant, namely, permeability, shrinkage, creep, workability and modulus of elasticity.
COMPATIBILITY :
CEMWET SP-3000 is compatible with all cements and admixtures particularly CEMWET - SRA, CEMWET - ACC, CEMWET-AEA.
PACKAING :
210 litre drums. Bulk deliveries in tankers available upon request.
| TYPICAL PROPERTIES |
Colour: |
Brown free flowing liquid. |
Specific gravity: |
1.20 ±0.035. |
Chloride content: |
Nil to BS 5075, to I.S.: 456-78 |
Nitrate content: |
Nil |
Freezing point: |
0 C. Can be reconstituted if stirred after thawing. |
Airentrainment: |
MaximumO#5%# |
DOSAGE
CEMWET SP- 3000 is normally dispensed at a rate of 0.8 -1.2 litres per 100 kg of cement. Other dosages may be used, depending on the materials and conditions. Trial mixes are recommended prior to production of concrete outside these normal ranges.
DIRECTION FOR USE
CEMWET SP-3000 should be added to the mix with the gauging water.
No extension to the mixing time is necessary. Never add CEMWET SP-3000 to dry cement.
Alternatively, when using CEMWET SP-3000 to produce flowing concrete at site using ready mix trucks, it can be added to the concrete via the feed hopper at the rear of the truck. Mix before discharge for 3 minutes at 10rpm to produce a fully homogeneous mix.
When using CEMWET SP-3000 to obtain very high early strengths, advantage must be taken of its water reducing properties.
EFFECTS OF OVER DOSAGE
A severe over- dosage of CEMWET SP-3000 v\
result in the following:
- Retardation of initial and final set.
- Slight increase in air entrainment.
- Increase in workability.
DISPENSING
CEMWET SP-3000 is introduced into the mixer together with mixing water. The plastici-sing effect or water reduction is higher if the admixture is added to the concrete after 50-70% of the mixing water has been added. The addition of CEMWET SP-3000 to dry aggregate or cement is not recommended.
SAFETY PRECAUTIONS : CEMWET SP-3000 contains no hazardous substances.
STORAGE :
CEMWET SP-3000. in tightly closed origins containers, has a shelf life of at least 2 years. The product must be stored in a place where temperatures do not drop below + 5 C. If the product has frozen, thaw and agitate until completely reconstituted.
TABLE 1 :
Typical examples of the CEMWET SP-3000 on strength of concrete.
| Binder |
Admixture |
Water |
Slump (mm) |
Comp. Strength N/mm 2 |
Type of cement |
CEMENT SP-3000 |
Free w/c ratio |
Initial |
30min |
24hrs |
3days |
7days |
28days |
I.S. Class 53 |
Nil |
0.45 |
10 |
5 |
11.10 |
24.00 |
3210 |
41.50 |
I.S.Cass 53 |
0.825 |
0.45 |
200 |
185 |
14.60 |
31.10 |
35.50 |
45.00 |
I.S. Class 53 |
0.825 |
0.37 |
20 |
10 |
15.40 |
32.50 |
44 80 |
4980 |
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