Chemical Admixtures - Cement
Accelerating admixtures are especially useful for modifying the properties of concrete in cold weather. Superplasticizers, also known as plasticizers or high-range water reducers (HRWR), reduce water content by 12 to 30 percent and can be added to concrete with a low-to-normal slump and water-cement ratio to make high-slump flowing concrete
Superplasticizer
Superplasticizers ( SPs ), 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.
Superplasticizer: Types, Advantages & Disadvantages
Types of Superplasticizer: 1.Sulphonated Melamine – Formaldehyde Condensates (SME): Sulfonated melamine formaldehyde condensates are often preferred superplasticizers in the precast industry because they do not dim the cement setting. 2.Sulphonated Naphthalene Formaldehyde Condensates (SNF):
Improved Superplasticizers for High Performance Concrete
In general, lignosulfonate (LS) has been used as a water reducer in normal concrete since 1930s (Scripture, 1937). Much research has been performed on this class of plasticizers with advancements
Super Plasticizers: Classification and Uses | Concrete Technology
Classification of Super Plasticizers: ADVERTISEMENTS: Following polymers are commonly used as base for super plasticizers: 1. Sulphonated melamine formaldehyde condensate (SMF) 2. Sulphonated naphthalene formaldehyde condensate (SNE) 3. Modified Lignosulphonates (MLS) ADVERTISEMENTS: 4. Other types.
- Can super plasticizers reduce water content in concrete mix?
- The use of super plasticizers can permit the reduction of water in the concrete mix upto 30% without producing any ill effect on the workability of the concrete i.e. without reduction in the workability of concrete, where as normal plasticizers with doses upto 0.1 to 0.4% by weight of cement can reduce water content from 5 to 15%.
- Can superplasticizers be used in high-performance concrete?
- The utilization of superplasticizers in the production of concrete offers several benefits such as improved workability, reduced water content, and increased strength. Nevertheless, the addition of superplasticizers in high-performance concrete may present challenges due to various factors.
- What is the difference between a plasticizer and a superplasticizer?
- 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. Plasticizers and superplasticizers also retard the setting and hardening of concrete.
- How do plasticizers and water reducers affect concrete strength?
- Since the heat of hydration of mass concrete goes down when the cement weight goes down, plasticizers can do this. Plasticizers and water reducers are chemical admixtures used to make concrete more workable. Unless the mixture is “starved” of water, increasing the w/c ratio reduces the concrete’s strength.
- What is a superplasticizer used for?
- 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. Superplasticizers allow reduction in water content by 30% or more.
- What are plasticizers & water reducers?
- Plasticizers and water reducers are chemical admixtures used to make concrete more workable. Unless the mixture is “starved” of water, increasing the w/c ratio reduces the concrete’s strength. An increase in durability is achieved by decreasing the water content (without “starving” the concrete).
