What is concrete water reducing agent?
Concrete admixture superplasticizer is a kind of Concrete admixture which can reduce water consumption under the condition of keeping the slump of Concrete basically unchanged. Mostly anionic surfactants, lignosulfonate, naphthalene sulfonate formaldehyde polymers. After adding concrete mixture, it has dispersive effect on cement particles, can improve its workability, reduce water consumption per unit and improve the fluidity of concrete mixture; Or reduce the amount of cement per unit, save cement.
Effect of water consumption on performance of Concrete Admixture superplasticizer soil mixture
The impact of water consumption is clear. In the practical engineering application of concrete, sometimes water if adding 1 to 3 kg/m3, concrete will appear serious bleeding phenomenon, can cause pits, the sand on the surface, holes and other defects, the uniformity of concrete pouring and construction quality cannot be guaranteed, thus results in the decrease of the strength and durability of concrete structure.
Concrete admixture superplasticizer is prone to stratification and segregation
In most cases, adding high range water Reducer superplasticizer to concrete will greatly reduce the viscosity of the slurry. At the same time, even if polycarboxylic acid superplasticizer dosage and water consumption are the best, there will be no bleeding phenomenon, but concrete is very easy to appear stratification and segregation phenomenon, mainly manifested in the coarse aggregate and mortar, net slurry separation, a large number of subsidence. This kind of concrete mixture for concrete engineering pouring without any vibration, stratification and segregation phenomenon is very obvious.
The compatibility of Concrete admixture superplasticizer is not ideal
Naphthalene based superplasticizer, aliphatic series, lignosulfonate, amino sulfonate and other traditional water-reducing agent can use any proportion to mix, and then can achieve a variety of concrete preparation requirements, these traditional water-reducing agent can not only in the water can be very good mutual solubility, Excellent superposition effect can also be obtained when used in combination
Polycarboxylate ether superplasticizer has great limitations, it can only be combined with the traditional water reducer lignosulfonate, and has poor compatibility with other traditional water reducer. If undertake compound use with other type of traditional water reducing agent, not only achieve superposition effect hard, still can make concrete fluidity also can be very poor, the loss that uses water greatly increases, slump degree is serious, concrete is dry and hard discharge, the strength of concrete and durability will be affected very seriously.
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