What are the problems when polycarboxylate superplasticizer is used in concrete engineering?
Since the beginning of this year, people around the world have felt the pressure of rising prices. Not only the rise in oil prices but also different industries have seen soaring prices. According to the latest data, from August 2021 to the present, the inflation rate in the United States has risen for 6 consecutive months, and this data has soared from the previous 5.3% to 7.9% today. Inflation in the United States, the global Many countries have been affected.
According to experts' forecasts, the inflation rate in the United States may exceed 10% this year, which will face the danger of collapse, which has a great impact on global inflation, including pce powder.
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.
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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Besides, because of the ever-changing international situation, the supply and prices of international bulk pce powder are still very uncertain.