Polycarboxylate superplasticize water reducing agent is a kind of concrete admixture, in the process of use need to pay attention to the following precautions.

(1) Reasonable control of water consumption

Polycarboxylate superplasticizer is very sensitive to water consumption, especially when using high solid content superplasticizer. In the process of trial mixing and production, it is found that sometimes when the water consumption is slightly increased by 1kg ~ 3kg, the concrete mix will appear serious bleeding, rubble piling, segregation and other phenomena.

(2) Use reasonable Polycarboxylate superplasticize content

In the process of use, the appropriate dosage is determined through the test. When the dosage is low, the concrete slump retention ability is poor, the slump loss is fast, and the fluidity becomes poor. When the dosage is too large, it is easy to cause serious bleeding, segregation and bottom grabbing of the concrete mix. The raw materials used in the project should be used in the test to facilitate production control. If necessary, the site construction conditions should be simulated according to the construction requirements.

(3) It is strictly prohibited to mix naphthalene admixture

It is strictly prohibited to use naphthalene superplasticizer and polycarboxylic acid superplasticizer mixed, especially in the construction site, need to take the method of "adding admixture twice" to adjust the work of concrete mix, must make clear the admixture types used in the car concrete, avoid mixing caused by concrete "fast setting", resulting in the vehicle concrete scrapped.

(4) Strengthen inspection

In the purchase of polycarboxylate superplasticize water reducing agent, first check the various technical indicators of water reducing agent, to ensure the stability of quality. Secondly, the raw materials used should be selected, the mix ratio of production should be tested, and the technical personnel of admixture production enterprises should be adjusted in time when problems are found.

(5) Timely communication with the construction unit

Before concrete production, it is necessary to understand the technical requirements of concrete from the construction party as well as the transport distance, construction technology, the temperature of the day, etc., if necessary, to the working face field investigation, reasonable allocation and reasonable scheduling of transport vehicles according to the actual situation.

(6) Be familiar with the characteristics of polycarboxylate superplasticize water reducer used

The variation law of polycarboxylate superplasticize water-reducing agent in the links of concrete trial mixing, production and construction is summarized through experiments, which is convenient to deal with emergencies.

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