Super plasticising admixture


Uses

  • To produce pump able concrete.

  • To produce high strength, high grade concrete M30 & above by substantial reduction in water resulting in low permeability and high early strength.

  • To produce high workability concrete requiring little or no vibration during placing.

ADVANTAGES

  • Improved workability - Easier, quicker placing and compaction.

  • Increased strength - Provides high early strength for pre cast concrete with the advantage of higher water reduction ability.

  • Improved quality - Denser, close textured concrete with reduced porosity and hence more durable.

  • Higher cohesion - Risk of segregation and bleeding minimized; thus aids pumping of concrete.

  • Chloride free - Safe in pre stressed concrete and with sulphate resisting cements and marine aggregates.

Description

PLAST- S 304 is based on Sulphonated Napthalene Polymers and supplied as a brown liquid instantly dispersible in water.

PLAST 304 has been specially formulated to give high water reductions upto 25% without loss of workability or to produce high quality concrete of reduced permeability.

Properties
Specific gravity : 1.220 to 1.225 at 30°C Chloride content : Nil to IS:456 Air entrainment : Approx. 1% additional air is entrained
Compatibility:

Can be used with all types of cements except high alumina cement. PLAST- S 304 is compatible with other types of Sigmacheme admixtures when added separately to the mix. Site trials should be carried out to optimize dosages.

Workability:

Can be used to produce flowing concrete that requires no compaction. Some minor adjustments may be required to produce high workable mix without segregation.

Cohesion:

Cohesion is improved due to dispersion of cement particles thus minimizing segregation and improving surface finish.

Compressive strength:

Early strength is increased up to 20% if water reduction is taken advantage of Generally, there is improvement in strength up to 20% depending upon W/C ratio and other mix parameters.

Durability:

Reduction in W/C ratio enables increase in density and impermeability thus enhancing durability of concrete.

Application instructions
Dosage

The optimum dosage is best determined by site trials with the concrete mix which enables the effects of workability, strength gain or cement reduction to be measured. Site trials with PLASTS 304 should always be compared with mix containing no admixture. As a guide, the rate of addition is generally in the range of 0.5 –2.0 litres / 100 kg cement.

Overdosing

An over dose of double the recommended amount of PLAST-S 304, will result in very high workability and some retardation of setting time will occur. However, the ultimate compressive strength will not be impaired.

Dispensing

The measured quantity of PLAST-304 should be added along with the gauging water. For best results, add PLAST- S 304 superplasticiser in the last phase after pre wetting the mix with 80% of the total water required.

Mix design
Typical results

M-30 mix, Sand Zone 2 (40%), Coarse aggregate -20 -5mm ( 60%)
Cement: L&T OPC

Test Cement content
Kg/m3
Dosage of
PLAST- S 304 L50 kg
of cement
W/C ratio Slump (mm) Compressive strength (N/mm2)
         
1 day
7 day
28 day
Control 375 Nil 0.57 55 10 26 40
Workability Increased 375 0.5L 0.57 140 11 30 43
Strength increased 375 0.5L 0.46 52 16 40 48
Precautions
Health and Safety instructions

PLAST- S 304 is non-toxic. Any splashes on the skin should be washed immediately with water. Splashes on the eyes should be washed immediately with water and medical advice should be sought.

Fire PLASTS 304 is non flammable.

Sigmacheme has a dedicated advisory service on Concrete Mix Design and can be contacted if assistance is required

Estimating
Packaging

PLAST- S 304 is supplied in 200 Kgs. And 250 Kgs. drums.

Storage

LAST- S 304 is supplied in 200 Kgs. And 250 Kgs. drums.