Water reducing admixture


GENERAL DESCRIPTION

PLAST- M 905 is a high performance plasticizer which allows large water reductions resulting in significant increase s in early and ultimate strengths. Increased workability can be achieved without loss in strength. PLAST- M 905 can be used as a retarding water-reducing admixture at higher dosages.

ADVANTAGES

  • Increased strength: Water reduction of upto 10% leads to high ultimate strength without increase in cement content.

  • Improved durability: Improves durability by increasing density and lowering permeability. Reduces shrinkage cracking because of lower water cement ratio.

  • Speeds up construction: Greatly improves workability which enable easier and quicker placing and optimum compaction.

  • Speeds up construction: Greatly improves workability which enable easier and quicker placing and optimum compaction.

  • Larger Pours: Extended setting times at higher dosages enable large volume of concrete to be placed thus avoiding cold joints.

  • Compatibility: PLAST- M 905 can be used with all types of Portland cements.

  • Chloride free: Safe in prestressed concrete and with sulphate resisting cements and in marine conditions.

Industrial Applications

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Description

PLAST- M 905 is a formulated blend of polymeric materials based on hydrolysed carbohydrate derivatives. It is designed to give maximum cement particle dispersion without producing unwanted side effects. This results in good, dense concrete having exceptionally high strength. PLAST- M 905 acts as a normal water reducing admixture at low to medium dosage rates. At higher dosages, it acts as a retarding plasticizer. The amount of retardation will also depend on chemical composition of the cement and concrete temperature.

Technical Support

Sigmacheme provides a technical advisory service supported by a team of specialists in the field.

Properties
Specific Gravity : 1.21 -1.220 @30°C
Chloride content : NIL to IS 456
Air entrainment : : Less than 1 % additional air is entrained.
Compatibility:

Can be used with all types of portland and slag cements except high alumina cements. PLAST- M 905 is compatible with other Sigmacheme admixtures provided they are added separately.

Workability:

The addition of PLAST- M 905 without reduction in the water content, increases the slump and significantly improves concrete flow characteristics without decrease in concrete strength.

Setting time:

Initial and final setting times will relate to cement type and ambient temperature. But typically the initial setting is extended between 1 to 4 hours depending upon dosage and temperature at constant workability.

Compressive strength:

Table 1 shows typical results where increased workability is obtained at original water cement ratio and increase in strength where workability is maintained and water cement ratio reduced.

Durability:

Where the water reducing properties of PLAST- 509 are utilized, there is increase in density, durability and the resistance of concrete to attack by aggressive agents. The reduced water cement ratio makes concrete less permeable.

Application instructions
Dosage

The optimum dosage determined by site trials with a specific concrete mix which enables the effects of workability, strength gain and setting time to be measured. The rate of addition of PLAST- M 905 is typical between 160ml to 500ml per 100kg cement. At dosages beyond 400ml per 100 kg of cement, it may act as a retarding plasticiser.

Table1
Typical test results
383)M30 mix
Compressive strength N/mm2 Density

Sr. Test Dosage of PLAST-M 905 Ltr/50 kg cement W/C Slump(mm) 3 Days 7 Days 28 Days kg/m³
1. Control Nil. 0.48 40 22.7 27.5 38.7 2395
2. Workability Increased 2390 0.15 0.48 100 24.5 31.6 43.3 2390
3. Increased 2400 0.15 0.44 40 27.5 36.7 48.9 2400

Note : The values quoted are representative of results obtained and are provided as illustrations of performance in different situations. Because of the variability of concreting materials, the results should only be taken as typical of the performance to be expected.

Estimating Packing

PLAST- M 905 is supplied in 200 Ltrs. and 250 kg. Containers.

Dispensing

The correct quantity of PLAST- M 905 should be measured by means of a suitable dispenser. The measured quantity of PLAST- M 905 should be added directly to the mixer preferably by dispensing to the mixing water. If the mixing water is added in more than one stage, PLAST- M 905 should be added at the last stage.

Dispensing

The correct quantity of PLAST- M 905 should be measured by means of a suitable dispenser. The measured quantity of PLAST- M 905 should be added directly to the mixer preferably by dispensing to the mixing water. If the mixing water is added in more than one stage, PLAST- M 905 should be added at the last stage.

Overdosing

Any overdosing of PLAST- M 905 can result in increased retardation of the initial set of the concrete. The ultimate strength of the concrete will not be affected and could be increased if advantage is taken of the increased workability by reducing water.

Storage

PLAST- M 905 has a shelf life of minimum 12 months when stored under normal temperatures. It should be protected from extremes of temperatures and preferably stored in shade.

Precautions
Health and safety

PLAST- M 905 is non – toxic, non-flammable and splashes on skin should be removed by copious amounts of water. If contact with eyes occurs, wash well with water immediately and seek medical advic