Chemical Admixtures - Cement
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.
Total Water Control - American Concrete Institute
jobsite delays mixing variation jobsite-added water (if allowed) sampling and testing variation limited measurement and data Concrete must be batched in one condition to meet acceptance criteria later at the construction site. Adding Water After Batching 10 minute haul 50°F and cloudy 6 in. slump 60 minute haul 90°F and
Superplasticizer - an overview | ScienceDirect Topics
Superplasticizers are a fundamental ingredient for lowering the yield stress of concrete. This chapter provides an overview of the chemical classes of superplasticizers and their performance, with a selective review of those aspects that we consider important in understanding superplasticizers. We also demonstrate the consistency in findings
Types of Admixtures for Concrete - Concrete Network
High-Range water reducers (superplasticizers) Can reduce water content from 12% to as much as 40% and are typically used in concretes designed to have slumps of 8 to 11 inches. They can be used to either increase slump (by 4 to 8 inches) or lower the water content of hot weather concrete mixes. Used to increase flowability.
High Performance Concrete Additives - Construction Review Online
The effect of Superplasticizers lasts only 30 to 60 minutes, depending on the brand and dosage rate, and is followed by a rapid loss in workability. As a result of the slump loss, Superplasticizers are usually added to concrete at the jobsite. Precautions in Use of Concrete Additives
- 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.
- Can superplasticizers reduce the environmental impact of concrete construction?
- An important consequence of the above is that superplasticizers can be used to reduce the environmental impact of concrete construction by reducing the cement content per cubic meter of concrete (see Preface).
- 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.
- What are the benefits of plasticizers & superplasticizers?
- As the plasticizers and super plasticizers improve workability and compactability, results in the reduction of water/cement ratio, thereby increasing the strength of concrete. It results in the al-round improvement in the properties of the hardened concrete.
- Do superplasticizers control workability?
- Therefore, at low w/c and with superplasticizers, it is the effective surface coverage of cement particles by superplasticizers that controls workability (see Section 16.3.1 and Chapter 11 (Gelardi and Flatt, 2016))—something that standard mortar tests are not designed to evaluate.
- Do superplasticizers affect admixtures?
- Indeed, superplasticizers may detrimentally impact the effect of other chemical admixtures, like in the case of air-entrainers (see Section 16.4.6). This involves a competitive adsorption at liquid–vapor interfaces, unlike water reducers and superplasticizers working at solid–liquid interfaces.
