concrete plasticizer-retarder

Description

concrete plasticizer-retarder

concrete plasticizer-retarder is a liquid additive based on polycarboxylate ether. This concrete superplasticizer reduces the concrete mixing water very strongly, which makes it very strong and high performance concrete efficiency and can also cause the expansion of cement particles.

Features:

• Suitable for Portland and SRC cement
• Ability to reduce the ratio of water to cement by about 30%
• Create expository concrete

Applications:

• Large-scale concrete pouring
• Ability to pour concrete in narrow sections and full reinforcement
• Possibility to pour concrete under water

Technical specification table:

Appearance	liquid
Color	brown
Specific gravity	gr/cm3 1/13
standard	ASTM C494 – ASTM C1017
ph	7

 

Package:

20 litter galon

Product Description – Carboxylate Concrete Superplasticizer

Carboxylate concrete superplasticizer is a polycarboxylate ether-based liquid admixture that plays a key role in optimizing the rheological properties of concrete. This advanced admixture, with its unique chemical mechanism, effectively reduces the mixing water of concrete significantly without reducing the workability or fluidity of the concrete.

The main feature of this type of superplasticizer is the ability to increase the uniform dispersion of cement particles throughout the entire volume of concrete. This function allows the production of high-performance concrete , which, while maintaining optimal fluidity, has high compressive strength and greater durability against environmental factors.

The use of carboxylate superplasticizers is essential, especially in special concretes such as self -leveling and self-compacting concrete ( SCC ). This additive allows the production of concretes with very high fluidity without increasing the water content; an issue that is of great importance in delicate structures, sections with high rebar density, or prefabricated parts.

Also, in situations where regulatory standards or project specifications require a reduction in the water-to-cement ratio ( w/c ), carboxylate superplasticizers are considered one of the best implementation solutions. Even in situations where other superplasticizer admixtures (such as naphthalene or lignosulfonate) are unable to compensate for the slump loss of concrete, this admixture shows a much more reliable performance.

Another key benefit of this admixture is the reduction of concrete’s permeability to moisture, aggressive ions such as chlorine and sulfate, and other destructive chemicals. As a result, concrete produced with this type of superplasticizer will perform much better in terms of durability, resistance to freeze-thaw cycles, and long-term durability in harsh environmental conditions.

Overall, carboxylated concrete superplasticizers not only help increase fluidity and reduce mixing water, but also have become one of the most important components of modern concrete mixtures by improving the mechanical properties and durability of concrete.

Method of using carboxylated concrete superplasticizer

How to properly use carboxylated concrete superplasticizer?

Carboxylate concrete superplasticizer can be used in two stages of the concrete production process: during concrete production in the batching plant or during transportation in the mixer truck. This additive can also be added to the ready-mix concrete; only after addition, thorough and uniform mixing must be carried out so that the additive is completely dispersed in the concrete.

To achieve optimal performance, it is recommended to continue mixing for at least one minute per cubic meter of concrete. This helps the lubricant to properly combine with the other components of the concrete and exert its desired properties.

The dosage of carboxylated concrete superplasticizer is determined by the grade of concrete. After calculating the dosage, the additive should be diluted with twice its volume of water and then gradually added to the concrete being mixed. This will ensure more uniform mixing and prevent thermal shock or local accumulation of the additive in the concrete.

Important: Never pour lubricant directly onto dry cement, as this can cause unwanted reactions and reduce the product’s effectiveness.

Carboxylate superplasticizer consumption rate

The standard dosage of carboxylate superplasticizer depends on the site conditions and various factors such as cement grade, type and size of aggregates, ambient temperature, water to cement ratio, etc. However, typically, the dosage of this additive is between 1 and 1.5% by weight of the cement used. To achieve specific properties, it is necessary to conduct tests under site conditions.

Carboxylate concrete superplasticizer maintenance

For proper storage of carboxylated concrete superplasticizer, the following must be observed:

The shelf life of the product in its original packaging is about one year.

The product should be stored away from cold and frost, heat, and direct and prolonged sunlight.

The ideal temperature for storing the product is between +10 and +30 degrees Celsius.

Carboxylate concrete superplasticizer packaging

Carboxylate concrete superplasticizer packaging includes the following:

• 20 liter gallon
• 220 liter barrel
• 1000 liter tank

Properties and effects of carboxylate superplasticizers

The properties and effects of carboxylate superplasticizers are as follows:

• Increasing concrete slump
• Improving the fluidity and workability of concrete
• Increasing the durability and stability of concrete
• Reducing permeability and water absorption of concrete
• Creating a smooth and beautiful surface in concrete (exposed)
• Strengthening cohesion and increasing the compressive strength of concrete
• Reducing the water-to-cement ratio by up to 30 percent
• Compatibility with all types of Portland and SRC cements
• Suitable for applying bulky concrete
• Significant reduction in concrete shrinkage
• Producing concrete with a water to cement ratio of 30 to 40 percent
• Helps to release trapped bubbles in concrete and mortar in a paste state

These properties make carboxylate superplasticizer a suitable option for improving concrete performance in various projects.

Applications of carboxylate superplasticizers in concrete

The main applications of carboxylate superplasticizers are:

• Possibility of pouring concrete underwater
• Production of high-performance concretes
• Suitable for large concrete pours
• Use in architectural concretes
• Pouring concrete with thermal pipes
• Suitable for pumpable concrete
• Production of injection mortars
• Suitable for self-compacting and self-leveling concretes
• Production of resistant and capable concrete
• Ability to pour concrete in narrow and heavily reinforced sections
• Suitable for producing prefabricated concrete parts
• Application in tunnel, sliding formwork and other similar systems

These characteristics make carboxylate superplasticizer a good choice for a variety of specific concrete pouring projects.

Mechanism of action of carboxylate superplasticizers

What is the mechanism of action of carboxylate superplasticizers?

Carboxylate superplasticizer is made on the basis of polycarboxylate ether and its molecular structure consists of one main branch and several sub-branches. When this additive is added to the concrete mixture or cement mortar, the polycarboxylate ether molecules surround the cement particles and create a charged layer. This charged layer repels the cement particles from each other in the concrete mixture or mortar. In other words, the sub-branches of the polycarboxylate ether prevent the cement particles from approaching each other and the hydrophobic force present in the main branch of the material places the water molecules at a distance further from the cement particles. This process causes the concrete mixture or mortar to become fluid. After a certain time, the charges created in the concrete mixture are reversed and this reduces the slump of the concrete and starts the process of cement hydration and setting of the concrete or mortar.

Physical and chemical characteristics of carboxylated concrete superplasticizer

What are the physical and chemical characteristics of carboxylated concrete superplasticizer?

Feature	Specifications
Mode	Liquid
Color	Honey brown
Specific gravity	1.13 g/ cm3
Standard	ASTM C494 – ASTM C1017
Chlorine ion	No
pH	About 7

Safety of carboxylated concrete superplasticizers

When using carboxylate concrete superplasticizer, it is essential to observe the following safety precautions:

This material is not toxic or flammable.

Contact with eyes should be avoided. In case of contact with eyes, rinse immediately with plenty of drinking water.

If skin allergies develop, you should see a doctor immediately.

Carboxylate concrete superplasticizer standard

Global standards for carboxylated concrete superplasticizers

ASTM C494 –ISIRI 2930