What Is Plasticizer In Civil?
Important Point
Plasticizer us in concrete for workability, Strength, and Durability of concrete. Plasticizer in concrete for Water-reducing admixtures usually reduces the required water content for a concrete mixture by about 5 to 12 percent.
The use of water-reducing admixtures is defining as Type A in ASTM C 494. The WRA mainly affects the fresh properties of concrete.
Which is measured by the dilution indicated in ASTM C 143-90. Water-reducing admixtures that delay the initial setting time by more than three hours. It is classified as a water-reducing admixture with a debugging effect (Type D).
Commonly used water-reducing admixtures (WRA) are lignosulfonates and hydrocarboxylic acids. The use of hydro carboxylic (HC) acids as WRA requires higher water content (w/c) compared to the lignosulfonates. Rapid bleeding is a problem for concrete treated with hydro carboxylic (HC) acids.
The increase in a slump is different according to its types and dosage. The typical dosage rate is based upon the cementitious material content (millilitres per hundred kilograms). The figure below illustrates the influence of the dosage of Lignosulfonates and HC acid on a slump.
It is shown in the figure that Hydro Carboxylic (HC) acids give a higher slump compared to lignosulfonates with the same dosage.
Water-Reducing Admixtures (WRA) has been used primarily in hot weather concrete pumping, placing, and tremie.
Careful concrete placement is required, as an initial setting time of cement will take place an hour earlier.
It is also shown that the use of Water-Reducing Admixtures (WRA) will give a higher initial concrete compressive strength by 10% compared to the control mixture.
Another benefit of using Water-Reducing Admixtures (WRA) is that higher concrete density is achieved, which makes the concrete less permeable and has higher durability.
Also, read: How Cement is Made | Cement Ingredients | History of Cement
What Is Superplasticizer In Civil?
This Superplasticizers, also known as high range water reducers, same as a plasticizer, are chemical admixtures used where well-dispersed particle suspension is required.
Polymers are used as dispersants to avoid particle segregation also to improve the flow characteristics of suspensions such as in concrete applications.
Their addition to mortar or concrete allows a reduction of the water to cement ratio (W/C), not affecting the workability of the mixture, and enables the production of high-performance concrete and self-consolidating concrete.
This effect drastically improves the performance of the fresh, hardening paste. Strength of concrete increases when water to cement (W/C) ratio decreases.
Their working mechanisms lack a full understanding, revealing, into certain cases, cement-superplasticizer incompatibilities.
The addition of superplasticizer in during transit is a fairly new development within the industry.
Superplasticizer added in transit through automated slump management systems, such as Verify, allows concrete producers to maintain slump until without reducing concrete quality.
Also, read: What is Plum Concrete | Application | Mix Design | Methodology
Difference Between Plasticizer And Superplasticizer in Civil
| Sr.No. | Plasticizer | Superplasticizer |
| 1 | To achieve a higher strength by decreasing the water-cement ratio at the same workability as an admixture free mix. | Superplasticizer by Self-leveling, Self-compacting concrete and also Penetration and compaction round dense reinforcement |
| 2 | To achieve the same workability by decreasing the cement content so as to reduce the heat of hydration in mass concrete. | Improved durability by removing water to reduce permeability and diffusion. |
| 3 | To increase the workability so as to ease placing inaccessible locations | Reduced shrinkage, especially if combined with reduced cement content. |
| 4 | Water reduction of more than 5% but less than 12% | Water reduction of more than 6% but less than 25% |
| 5 | This Plasticizer called water reducer | This Superplasticizer called high range water reducer |
| 6 | It is an additive used to improve the plasticity of a certain substance | It is a water-reducing admixture capable of producing large water reduction or great flammability |
| 7 | This increases the plasticity matricidal such as water reducer in a concrete mixture | This further increases the water requirement for concrete mixture increase the strength and durability of concrete |
| 8 | Add plasticizer 0.1 – 0.5 % weight of cement | Add Superplasticizer 0.5 – 3% weight of cement |
Plasticizer and Superplasticizer
Plasticizer: Plasticizers are used to increase the plasticity of polymer materials such as PVC and as a water reducer in concrete mixtures. Superplasticizer: Superplasticizers are used to further increase the water requirement for concrete mixtures, increasing the strength and durability of concrete.
Can Plasticiser Be Used in Concrete?
“Plasticizers or water reducers are chemical admixtures that can be added to concrete mixtures to improve workability. Unless the mix is “starved” of water, the strength of concrete is inversely proportional to the amount of water added or water-cement ratio.
What Is Plasticizer for Concrete?
Plasticizers are chemical compounds that enable the production of concrete with approximately 15% less water content. Superplasticizers allow reduction in water content by 30% or more. These additives are employed at the level of a few weight percent. Plasticizers and superplasticizers retard the curing of concrete.
Superplasticizer in Concrete
Superplasticizers (SP’s), also known as high range water reducers, are additives used in making high strength concrete. Plasticizers are chemical compounds that enable the production of concrete with approximately 15% less water content. Superplasticizers allow reduction in water content by 30% or more.
Types of Plasticizers for Concrete
Types of Plasticizers in Concrete
- Anionic Surfactants. Lignosulphonates. Modifications and derivatives of lignosulphonates. Salts of sulphonates. Hydrocarbons.
- Nonionic Surfactants. Polyglycol esters. Hydroxylated carboxylic acids. Modifications and derivatives of hydroxylated carboxylic acids.
- Other Products.
Benefits of Superplasticizers in Construction
- Superplasticizers Help Keep Concrete Strong
- Increased Density. Improved Bond Strength. Greater Volume Stability and Reduced Shrinkage Cracking. Increased Abrasion
- Resistance.
Difference Between Plasticizers and Superplasticizers
Plasticizers are chemical compounds enabling the production of concrete with approximately 15% less water content. Superplasticizers allow reduction in water content by 30% or more. These additives are employed at the level of a few weight percent.
Superplasticizers for High-Strength Concrete
Superplasticizers (SPs), also known as high range water reducers, are additives used for making high-strength concrete or to place self-compacting concrete. Plasticizers are chemical compounds enabling the production of concrete with approximately 15% less water content.
Effect of Plasticizers on Concrete Durability
Water reducers, or plasticizers, have allowed finishers to place the concrete with much less water, and thus produce higher strength and more durable concrete.
Super Plasticizer
Superplasticizers, also known as high-range water reducers, are chemical additives used in concrete to improve its workability and flowability without sacrificing strength. These additives are typically used in situations where high-performance concrete is required, such as in large-scale construction projects or in the production of precast concrete elements.
Concrete Plasticizer
A concrete plasticizer is an additive used in concrete mixtures to improve the workability and performance of the concrete. It is typically a chemical admixture that is added to the concrete mix during the mixing process. The plasticizer reduces the water content required for the desired consistency of the concrete, thereby increasing its workability without compromising its strength or durability.
Plasticizer Admixture
Plasticizers are the admixtures used to mix in cement to improve their qualities and make them suitable for construction. It’s effects on concrete:
- Reduce the water/cement ratio without any effect on workability.
- It increase setting time.
Plasticizers and Superplasticizers Are Used To?
Plasticizers and superplasticizers are used in various industries, particularly in the construction and polymer industries, to modify the properties of materials such as concrete and plastics.
Types of Superplasticizer
The time taken for ettringite formation has been determined without superplasticizer and in presence of three different types of superplasticizers: polynaphtalene sulfonates (PNS), polycarboxylate-polyox (PCP) and diphosphonate terminated polyoxyethylene.
What Is Superplasticizer Admixture ?
Superplasticizer admixtures, or high-grade water reducers, are a type of admixture similar to plasticizers. It is added to concrete to help reduce the water content in concrete by 12% to upwards of 30% and help increase its workability.
What Does Plasticizer Do in Concrete?
Plasticizers: Plasticizers for concrete belong to the group of chemical admixtures for construction, which reduce the amount of water needed to obtain a certain consistency in concrete.
What Is the Allowed Reduction of Water with Super Plasticizers Without Reducing Workability?
Super plasticizers permits reduction of water content about 30% without reducing the workability.
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