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.
Cement-superplasticiser compatibility - Issues and challenges
The factors controlling the compatibility are discussed next in detail, including the role of the chemistry (of cement and admixture), the presence of other mineral and chemical admixtures, and...
Study of the admixture-cement compatibility for the
It has been found that Polycarboxylate Ether (PCE) based superplasticizers show greater compatibility and economical dosage as compared to Sulphonated Napthalene Formaldehyde (SNF) based...
Compatibility assessment of commercial cements and
ready mixed concrete, high performance concrete, high strength concrete and se-compacting concretes are being lf used. For these concretes, use of super plasticizers is mandatory to gain workability. At the same time, knowing the compatibility of it with the type of cement used is also essential. The compatible combination of cement and
Selection of Superplasticizers for High-Performance Concrete
The first moment consumption of Superplasticizer molecules after the mixing is qualified as the cement/Superplasticizer compatibility. It is very difficult to make high-performance concrete with a very low water-cement ratio, that it will still have a slump value of 50mm 30 minutes with an initial slump value of 200mm.
- How do superplasticizers affect the workability of concrete?
- Superplasticizers directly influence the workability of concrete, and certain factors are considered such as type of admixture, time of addition, addition sequence, mixing time, dosage, w/b ratio, and amount/nature of binder. The dosage between 0.6 to 2% by weight of cement resulted in minimal retardation.
- What is a superplasticizer in cement?
- According to ASTM C494, superplasticizers are linear polymers that possess a sulfonic acid group. The addition of superplasticizers into a mix neutralizes the surface interaction among the cement particles and thus, reduces the viscosity of cement paste (free from agglomeration) resulting in reduced pore volume.
- Does superplasticizer -poly carboxylate ether in cement composites increase strength?
- Our paper reports the addition of high performing superplasticizer -Poly Carboxylate Ether in cement composites as per Indian Standards has resulted in a denser cementitious matrix and higher strength gain at longer terms compared to normal superplasticizers. 1. Introduction
- Which superplasticizer admixture is better?
- Based on the findings, out of three superplasticizers, PC—based admixture showed a better improvement in strength aspects compared to other mix. Compressive strength of UHPC (a) SNF admixture (b) SMF admixture (c) PC admixture
- Why are superplasticizers used in Indian cementitious mix?
- Superplasticizers are increasingly being used in Indian cementitious mix from the 1980 s onwards as they have proved their credibility in parameters like water and cement reduction apart from workability retention, strength gain, and ease to place and pump.
- What factors influence the incompatibility of superplasticizers?
- The factors influencing incompatibility include the type of admixture, dosage, cement composition, mix proportion, etc.; the interaction between the cement and superplasticizers is well described by Aitcin using a schematic diagram as shown in Fig. 2 .
