VPEG has better slump retention performance, while HPEG has better water-reducing properties. However, if you want to prepare it yourself, it is not a simple task in terms of obtaining raw materials and synthesis methods.
Modified polyethers: isopentenyl alcohol polyoxyethylene ether TPEG, isobutenyl alcohol polyoxyethylene ether HPEG, methacrylic alcohol polyoxyethylene ether VPEG, these modified polyethers can be used in Water reducing agent production, but the performance of the products produced by each monomer manufacturer is slightly different. Generally speaking, a VPEG has better collapse retention performance. In actual production, after adjusting the acid to ether ratio and the redox system, the synthesized The products can all meet the corresponding requirements, such as the level of water reduction rate and collapse retention performance, which can be adjusted accordingly. The monomers produced by each manufacturer are different, and the products obtained by using different acid-to-ether ratios and reduction systems are also different. Different, I personally think that we cannot judge based on codes. Based on actual production, the monomers of each monomer factory should select a reasonable acid-to-ether ratio and redox system, so as to achieve the best cost-effective products.
Early-strength series high-performance water-reducing agent (liquid) is the third generation of high-performance water-reducing agent developed after the ordinary water-reducing agent represented by lignocalcium and the high-efficiency water-reducing agent represented by naphthalene series. Water agent is currently the most cutting-edge, high-tech, high-efficiency water-reducing agent with the best application prospects and the best overall performance in the world. PC early-strength series high-performance water-reducing agent is the most advanced water-reducing agent product with the most technological content in the world today. Performance comparison with similar products at home and abroad shows that the PC early-strength series high-performance water-reducing agent has reached the current international advanced level in terms of technical performance indicators and cost-effectiveness.
1. Low dosage and high water reduction rate: the water reduction rate can be as high as 45%, and can be used to prepare high-strength and high-performance concrete.
2. The loss is small when the slump is light: the slump loss of ready-mixed concrete is less than 15% in 2 hours, which is extremely beneficial for long-distance transportation and pumping construction of commercial concrete.
3. Concrete has good workability: Concrete prepared with PC early-strength series high-performance water-reducing agent will not have obvious segregation or bleeding even under high slump conditions. The appearance of the concrete Uniform color. It is extremely beneficial for preparing high-fluidity concrete, self-leveling concrete, self-compacting concrete, and fair-faced concrete. When used to prepare high-grade concrete, the concrete has good workability and cohesion, and the concrete is easy to mix. .
4. Small shrinkage of concrete: It can significantly reduce the shrinkage of concrete and significantly improve the volume stability and durability of concrete.
5. Very low alkali content: alkali content ≤0.2%.
6. Good product stability: no precipitation at low temperatures.
7. The product is green and environmentally friendly: The product is non-toxic and harmless. It is a green and environmentally friendly product and is conducive to sustainable development.
8. Good economic benefits: The comprehensive project cost is lower than using other types of products.
Early-strength high-efficiency water-reducing admixture is more convenient, safe and efficient to use, but it also has certain limitations. Its advantages are only relative. Therefore, you may encounter the following problems during construction and production.
1. It is difficult to unload from the mixer truck
Reason: It may be caused by the serious incompatibility between cement and early strength.
Processing method: A compound test should be done for each batch of cement using the construction mix ratio before opening.
2. The slump of the concrete mixture suddenly increased and water bleeds
Reason: This batch of cement has good adaptability to the water-reducing agent.
Treatment method: The dosage of admixture should be appropriately adjusted.
3. There are bubbles on the surface after hardening
Reason: In order to facilitate construction during use, the amount of water-reducing agent is increased.
Measures: Strictly construct according to the mix ratio, improve construction technology, and strengthen construction management.
4. Concrete sets and hardens slowly
Cause: the amount of water-reducing agent is increased or the curing temperature is not enough.
Method: Construction should be carried out strictly according to the mix ratio and the maintenance time should be extended.
5. The slump of concrete is significantly different from the design value
Reason: Incompatibility occurs when two admixtures are mixed.
Method: Do a compatibility test before use and adjust the blending ratio. </p
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