BAB III LANDASAN TEORI
3.3.2 Superplasticizer Superplasticizer merupakan bahan tambah tipe F atau High Range Water Reducer (ASTM C494-82), yaitu bahan tambah kimia yang berfungsi mengurangi air sampai 12% atau bahkan lebih. Superplasticizer tersusun atas asam sulfonat yang berfungsi menghilangkan gaya permukaan pada partikel semen sehingga
Superplasticizer - Lauw Tjun Nji
Superplasticizer adalah polimer linear yang mengandung sulfonic acid (asam sulfonat), yang secara umum terbagi menjadi 4 jenis/kelompok : Sulfonated melamine-formaldehyde condensates (SMF) Sulfonated naphthalene-formaldehyde condensates (SNF) Modified lignosulfonates (MLS) Polycarboxylate derivatives, misal jenis polycarbonix ether (PCE)
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- 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.
- How does super-plasticizer affect Slump values?
- The time when the super-plasticizer is added to concrete affects the slump values. By adding the super-plasticizer with the mixing water, the slump value is increased considerably. Even higher slump values are possible by the addition of the admixture a few minutes after the concrete is mixed with water.
- When were superplasticizers used?
- In North America they were used from 1974.1’1 The advantages derived by the use of superplasticizers include pro-duction of concrete having high workability for easy placement, and pro- duction of high strength concrete with normal workability but with a lower water content.
- 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 ASTM standards for superplasticizers?
- The ASTM standards C 494-92 and C 1017-92 provide information on the specifications for superplasticizers. Two types of superplasticizers, Type F water-reducing, high range, and Type G water- reducing, high range, and retarding, are described.
- Can superplasticizers be used to produce jlowing concrete?
- To produce jlowing concrete. Superplasticizers have been used to produce self-compacting, self-leveling flowing concretes. In this application, no attempt is made to reduce either the water-to-cement ratio or the cement content.