Concrete Liquid Retarder
LL63
Liquid Admixture for Delaying Concrete Setting
What is Concrete Liquid Retarder?
Concrete Liquid Retarder is a liquid admixture formulated based on gluconates and retarding agents. This well-tested product, when added to concrete, delays the setting time and slows down the hydration reaction. Additionally, using this retarder facilitates mass concrete placement and enables concrete pouring in hot and windy climates.
In situations where rapid setting due to environmental conditions can negatively impact the strength and properties of concrete or mortar, using Concrete Liquid Retarder is a suitable option to control the initial setting time. Therefore, it is highly recommended for hot climates and large-scale concreting. This product increases the workability time of fresh concrete.
Generally, this liquid retarder is used to delay the setting process, improving the workability of the concrete mix. These admixtures are especially beneficial in hot or tropical climates, where rapid setting can pose challenges.
Mechanism of Action
How does Concrete Liquid Retarder work?
Concrete Liquid Retarder prevents the dissolution of ions that have the highest solubility during the initial hydration phase, such as aluminates and calcium ions. Due to its polar properties in aqueous solutions, the molecules of the retarding admixture delay the saturation of calcium ions in the concrete mix, postponing the initiation of the hydration process and ultimately extending the final setting time of the concrete.
Properties and Effects
What are the properties and effects of Concrete Liquid Retarder?
- Suitable for concrete placement in hot climates
- Suitable for concrete pouring in windy areas
- Reduces concrete temperature in mass concrete pours
- Enables concrete production and transportation over long distances
- Extends concrete workability and workability time
- Delays both initial and final setting times of concrete
- Reduces the risk of cold joints in large-scale concrete pours
- Enhances long-term concrete strength
- Increases the vibration time of concrete
- Prevents surface and thermal cracking in concrete
- Compatible with all types of Portland cement
Applications
Where is Concrete Liquid Retarder used?
- Suitable for mass and semi-mass concreting, such as dam and bridge construction
- Suitable for concrete placement at distances beyond the usual range
- Helps control thermal gradients caused by cement hydration
- Ideal for concreting in hot regions
- Recommended for projects requiring controlled setting time in both initial and final phases
- Suitable for pumpable concrete and long-distance transportation from concrete plants
Physical and Chemical Properties
What are the physical and chemical characteristics of Concrete Liquid Retarder?
| Property | Value |
| State | Liquid |
| Color | Colorless |
| Specific Gravity | 1.6 gr/cm³ |
| Chloride Content | None |
| pH | 8 |
Standards
Which standards does Concrete Liquid Retarder comply with?
- ASTM C494
- ISIRI 2930
- EN 934-2
Dosage
What is the correct dosage of Concrete Liquid Retarder?
The setting delay effect of this admixture depends on several factors, including ambient temperature, cement content, concrete temperature, and the required setting delay. Therefore, the exact dosage should be determined based on precise laboratory tests. Generally, the recommended dosage is 0.2% to 0.4% of the cement weight used in the mix.
Usage Instructions
How should Concrete Liquid Retarder be used?
- Dilution: The required amount of the admixture should be diluted with twice its volume of mixing water.
- Addition: The diluted admixture should be gradually added to the mixing concrete.
- Mixing: Ensure thorough mixing for at least 1 minute per cubic meter of concrete.
- Batching: The retarder can be added at the batching plant or directly into the truck mixer.
Important Note: The admixture should not be poured directly onto dry cement.
Safety Guidelines
What safety precautions should be taken when using Concrete Liquid Retarder?
- This product is non-toxic, non-flammable, and non-hazardous for humans and the environment.
- Avoid direct contact with eyes and skin.
- In case of skin contact, rinse immediately with plenty of fresh water.
- In case of eye contact, flush immediately with clean water and seek medical attention.
- Always wear gloves, safety glasses, and a mask while handling the product.
Storage Conditions
How should Concrete Liquid Retarder be stored?
- Shelf Life: 1 year in the original sealed packaging.
- Storage Conditions: Keep away from frost, extreme heat, and prolonged direct sunlight.
- Optimal Storage Temperature: +10°C to +30°C.
Packaging
What are the packaging options for Concrete Liquid Retarder?
- 20-liter plastic jerrycan
- 220-liter drum
- 1000-liter IBC tank
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