How Super Are Superplasticizers? - Concrete Construction
Superplasticizers transform stiff, low-slump concrete into flowing, pourable, easily placed concrete. They can improve workability, speed finishing, increase strength, conserve cement and help reduce shrinkage and thermal cracking. However, because of their brief history, questions and doubts about their use still exist.
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.
Superplasticizers
Superplasticizers High-level water reduction products can be used in high strength concrete, pumpability, self-consolidating concrete, low permeability, low water absorption concrete and low shrinkage application.
Superplasticizer - an overview | ScienceDirect Topics
Superplasticizers are additions that allow a given degree of workability to be obtained at a reduced water/cement ratio. The ratio may be reduced by up to 20% in the presence of, for example, sulphonated naphthalene formaldehyde condensate, which is absorbed at the solid/liquid interface.
Superplasticizer: Types, Advantages & Disadvantages
Superplasticizers (SPs) are also known as high- range water reducers that are additive used in making high strength concrete. Plasticizers are chemical compounds that enable the production of concrete with approximately 15% less water content. Superplasticizers allow a 30% or more reduction in water content.
- What are superplasticizers used for?
- Superplasticizers are known to reduce the requirement of water by 30% or more. They enable the manufacturing of emerging concrete technology like self-consolidating concrete and high-performance concrete [169,275]. Cement particles are separated from each other due to the repulsion of negatively charged superplasticizers.
- What is a superplasticizer in concrete?
- Superplasticizers allow a 30% or more reduction in water content. It is chemical admixtures that are added to the concrete to improve their flowing ability, they help to reduce the amount of water in the concrete and to improve the strength and durability of concretes. They achieve a reduction in water content without loss of workability.
- How many superplasticizers are used in precast concrete?
- Reliable statistics on the extent of the use of superplasticizers are not available. The data provided by Malhotra121 in 1989 provides some indica-tion. In industrialized countries, the percentage of ready mix concrete utilizing superplasticizers varied between 1 and 20%. In precast concrete however, the use varied between 20 and 100%.
- Are superplasticizers better than plain concrete?
- Thus, superplasticizers cause no inconveniences even when concretes are autoclaved and, at the same workability, they give higher strength than plain concrete. The considerable reduction allowed by the naphthalene sulphonates and a timely choice of steam curing and autoclaving cycles enable very high-strength concrete to be obtained.
- What are the four types of superplasticizers?
- Superplasticizers are characterized into four fundamental groups Lignosulfonic acid, Melamine form-aldehyde sulfonic acid, naphthalene formaldehyde sulphonic acid, and Poly-carboxylic acid . Chandra et al., studied the impact of the superplasticizer group and quantity on the workability of concrete.
- 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.
