What are the problems when polycarboxylate superplasticizer is used in concrete engineering?

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Effect of water consumption on properties of polycarboxylate concrete mixture

The influence of water consumption is very obvious. In the actual application of concrete engineering, sometimes if the water consumption is increased by more 1~3kg/m3, the concrete will appear serious bleeding phenomenon, which will cause defects such as hemp surface, sand and holes on its surface, and the uniformity of concrete pouring and construction quality cannot be guaranteed, so the strength and durability of concrete structure will be reduced.

 

Polycarboxylate concrete is prone to delamination and segregation.

In most cases, when polycarboxylate superplasticizer is added to concrete, the viscosity of paste will be greatly reduced. At the same time, even if the amount and water consumption of polycarboxylate superplasticizer are the best, and the phenomenon of bleeding will not occur, the phenomenon of stratification and segregation is easy to occur in concrete, which is mainly manifested in that the coarse aggregate will be separated from mortar and paste, and a large number of them will sink. This kind of concrete mixture does not have any vibration in concrete pouring, and the phenomenon of delamination and segregation is also very obvious.

 

Non-ideal compatibility

Naphthalene series, aliphatic series, lignin sulfonates, aminosulfonates and other traditional superplasticizers can be mixed in any proportion, so as to meet the preparation requirements of various concretes. these traditional superplasticizers can not only be well miscible in water, but also achieve excellent superposition effect when mixed. Polycarboxylate superplasticizer has great limitations, it can only be used in combination with traditional superplasticizer lignosulfonate, and its compatibility with other traditional superplasticizers is poor. If combined with other types of traditional superplasticizer, it is not only difficult to achieve the superposition effect, but also makes the fluidity of concrete very poor, the water consumption increases greatly, the loss of slump is serious, and the concrete is dry and difficult to unload. the strength and durability of concrete will be seriously affected.

 

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