The key technology of the application of polycarboxylate superplasticizer

The key technology of the application of polycarboxylate superplasticizer

In recent years, polycarboxylate superplasticizers have been widely used in many construction projects in my country. Modern concrete has high requirements for additional functional additives, so when polycarboxylate superplasticizer is added to the concrete system, the following key technologies should be considered.

(1) Compatibility technology of polycarboxylate system. Due to the special structure of the polycarboxylate high-performance water reducer, it cannot be stored and used together with other water reducers, especially the naphthalene-based water reducer. When it needs to be used alternately with different types of water reducing agents, the relevant containers must be carefully cleaned to prevent cross-contamination from affecting the quality of the concrete. The adsorption performance of the superplasticizer varies with different types of cement. Since the compatibility range of polycarboxylate superplasticizers in cement is relatively narrow, poor compatibility is unavoidable. Therefore, it is necessary to increase its dosage or use different types of cement. to effectively solve this problem.

⑵Polycarboxylate superplasticizer retarding technology. In the construction process, due to the short retarding time, the use of retarders can effectively prolong the plasticity of concrete. However, the incompatibility between the two should also be considered to avoid the reduction of concrete performance.

⑶ gas content control. Polycarboxylate water reducer has a good air-entraining effect and can be used together with defoamers and air-entraining agents. By eliminating first and then introducing, the air content of concrete can be controlled, and its workability and durability can be improved.

⑷ Control of mud content in sand and gravel. The mud content of sand and gravel will also affect the application effect of polycarboxylate high-performance water reducer. If the mud content in the sand exceeds 2%, the structure between the clay layers will absorb a large number of water reducing agent molecules, which will reduce the flow performance of the concrete. If the mud content in the construction process is relatively large, you should consider choosing a clay-resistant polycarboxylate superplasticizer.