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Introduction of water reducer (1)

A water reducing chemical, as the name implies, is used to reduce the water content of a concrete mixture while maintaining a constant workability. The resultant effect of the reduced water content is the increased strength and durability of concrete. However, water reducers may also be employed to ‘plasticize’ the concrete, i.e. make concrete flowable. In this case, the water content (or water to cement ratio) is held constant, and the addition of the admixtures makes the concrete flow better, while the compressive strength (which is a function of the water to cement ratio), is not affected. Another use of water reducers is to lower the amount of cement (since water is proportionately reduced) without affecting both strength and workability. This makes the concrete cheaper and environmentally friendly, as less cement is consumed.

SNF water reducer

Water reducers are classified broadly into two categories: (1) Normal and (2) High range. The normal water reducers are also called ‘plasticizers’such as our sodium lignosulphonate, calcium lignosulphonate , while the high range water reducers are called ‘superplasticizers’just like our sodium naphthalene formaldehyde. While the normal water reducers can reduce the water demand by 5 – 10%, the high range water reducers can cause a reduction of 15 – 40%.

SNF water reducer

Used at high dosages, lignosulphonates are capable of producing high range water reduction. However, a major problem with the use of lignosulphonates as superplasticizers is the excessive retardation and air entrainment in concrete. Modified lignosulphonates as superplasticizers lead to concrete with lesser variation in properties.

 

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