Why should polycarboxylate superplasticizer be added to concrete

What is polycarboxylate superplasticizer?

Polycarboxylate superplasticizer is an important additive to ensure the strength of concrete and achieve pumping performance, and plays a pivotal role in improving and improving the operability of concrete construction. In this paper, according to the action mechanism and influencing factors of concrete water reducing agent in concrete construction, the optimal dosage of concrete water reducing agent is accurately determined, the dosage method of water reducing agent is found, and the compatibility and compatibility of water reducing agent with cement are verified. Adaptability, simply, accurately and reliably guarantee the quality of the project, reduce the cost of the project, and achieve the best effect of the construction project.

Why should polycarboxylate superplasticizer be added to concrete?

After the cement is mixed with water, many floc structures will be formed due to the gravitational effect between the cement particles, so that 10% to 30% of the water is wrapped in them, which greatly reduces the fluidity of the concrete mixture. When an appropriate amount of water-reducing agent is added, the molecules of the water-reducing agent are directionally adsorbed on the surface of the cement particles, and the hydrophilic group of the water-reducing agent points to the aqueous solution. And it increases with the increase of the concentration of the superplasticizer, resulting in electrostatic repulsion, which causes the cement particles to disperse each other, the flocculation structure disintegrates, the number of capillary pores is significantly reduced, and the mixing water wrapped in it is released, which can effectively increase the concrete mixing. fluidity and compactness.

After adding an appropriate amount of water-reducing agent to concrete, it can reduce the water-cement ratio of concrete, reduce the amount of cement, improve the early strength of concrete, advance concrete formwork removal time, accelerate formwork turnover, shorten construction period and reduce project cost.

There is a compatibility problem between superplasticizer and each component material of concrete, which has the greatest impact on cement, between the same cement and different superplasticizers, or between the same superplasticizer and different cements. There is a significant difference in the compatibility of concrete, and this difference will affect the rheological properties of concrete, thereby affecting the workability, strength and durability of concrete. Therefore, it is necessary to do a series of comparative tests for the selection of various types of concrete water reducers, as well as the performance and dosage of water reducers to determine the optimal dosage of concrete water reducers.

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