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Water Reducer

Source: | Updated: Jan 14, 2016

Water reducers affects mainly the fresh properties of concrete by reducing the amount of water used by 5% to 12% while maintaining a certain level of consistency. The use of WRA may accelerate or retard the initial setting time of concrete. The WRA that retards the initial setting time more than three hours later is classified as WRA with retarding effect. Commonly used WRA is lignosulfonates and hydrocarboxylic (HC) acids. The use of HC acids as WRA requires higher water content compared to the lignosulfonates. Rapid bleeding is a problem for concrete treated with HC acids. Increase of slump is different according to its type and dosage. Typical dosage rate is based upon the cementitious material content (milliliters per hundred of kilograms). are special chemical products added to a concrete mixture before it is poured. They are from the same family of products as retarders. The first class of water reducers was thelignosulfonates which has been used since the 1930s. These inexpensive products were derived from wood and paper industry, but are now advantageously replaced by other synthetic sulfonate andpolycarboxylate, also known as superplasticizers. Water reducers offer several advantages in their use, listed below:

reduces the water content by 5-10%

decreases the concrete porosity

increases the concrete strength by up to 25% (as less water is required for the concrete mixture to remain workable)

increases the workability (assuming the amount of free water remains constant)

reduces the water permeability (due to less water being used)

reduces the diffusivity of aggressive agents in the concrete and so improves the durability of concrete

gives a better finish to surfaces (due to all of the above)

Water reducer that is water reducing agent, it is one item of concrete admixtures, it could reduce the water volume of cement in concrete mixing, then to enhance the strength of concrete, it includes lignosulfonates, naphthalene sulfonate(SNF) and polycarboxylate superplasticizer(PCE).

Water reducing Agents (WRA) affects mainly the fresh properties of concrete by reducing the amount of water used by 5% to 12% while maintaining a certain level of consistency. The use of WRA may accelerate or retard the initial setting time of concrete. The WRA that retards the initial setting time more than three hours later is classified as WRA with retarding effect. Commonly used WRA is lignosulfonates and hydrocarboxylic (HC) acids. The use of HC acids as WRA requires higher water content compared to the lignosulfonates. Rapid bleeding is a problem for concrete treated with HC acids. Increase of slump is different according to its type and dosage. Typical dosage rate is based upon the cementitious material content (milliliters per hundred of kilograms).

 

 

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