Compatibility of polycarboxylate superplasticizer with other admixtures.
Which Kind of Additives to Make Concrete Stronger?
What is a water reducer?
Additives to make concrete stronger. Superplasticizer mother liquor is a kind of surfactant whose molecular structure is carboxyl-containing graft copolymer. It belongs to the third-generation superplasticizer mother liquor. It has excellent comprehensive performance and is an ideal admixture for producing various strength grades of concrete and components.
It is especially suitable for configuring pumped concrete, high-strength concrete, fair-faced concrete, self-compacting concrete and concrete components. It can be widely used in industrial and civil buildings, water conservancy and hydropower projects, roads and bridges and other fields.
Synthesis of water reducing agent mother liquor?
A : In situ polymerization grafting method
Using polyether as the medium for the polymerization of unsaturated monomers, the main chain polymerization and the introduction of side chains are carried out at the same time, the process is simple, and the molecular weight of the synthesized water reducing agent can be controlled to a certain extent, but the esters involved in this method The chemical reaction is a reversible reaction, and the grafting rate is relatively low when carried out in an aqueous solution, which has been gradually eliminated. Additives to make concrete stronger.
B : First polymerization and then functionalization method
This method is mainly to synthesize the main chain of the superplasticizer first, and then introduce the side chain for functionalization by other methods. This method is difficult to operate, the molecular structure of the superplasticizer is inflexible, and the compatibility between the monomers is not good, making it difficult to operate. The use of this method is greatly restricted.
C : Monomer direct copolymerization method
This method is: firstly prepare the active macromonomer, and then carry out the copolymerization reaction of the small monomer and the macromonomer in the aqueous solution under the initiation of the initiator. With the increasing maturity and variety of macromonomer synthesis techniques, this synthesis method has become the most commonly used method for the synthesis of polyanthoic acid superplasticizers at this stage.
What are the advantages of water reducing agent mother liquor?
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This product is a light yellow liquid, non-toxic, odorless, and non-flammable; the recommended dosage range is 1.0%-2.5%, and the water reduction rate is 15%-30%; the early strength and strengthening effect are obvious, which can effectively improve the impermeability and resistance of concrete. Freezing and durability; the initial and final setting time is prolonged, the cement hydration after final setting is normal, and the strength development is stable; the plastic retention performance is good, and the slump loss is small.
The advantages of polycarboxylate water reducing agent: low dosage, high water reducing rate, water reducing rate can be as high as 45%. The slump loss over time is small, and the slump loss rate of ready-mixed concrete is less than 5% in 1h and less than 10% in 2h. The reinforcement effect is remarkable. The 3d compressive strength of concrete is increased by 50-110%, the 28d compressive strength is increased by 40-80%, and the 90d compressive strength is increased by 30-60%. Additives to make concrete stronger.
The concrete has excellent workability, no segregation and bleeding, and the appearance and color of the concrete are uniform. When used to formulate high-grade concrete, the concrete has good cohesion and is easy to mix. The air content is moderate, has no adverse effect on the elastic modulus of concrete, and has good frost resistance durability. It can reduce the early hydration heat of cement, which is beneficial to mass concrete and summer construction.
Excellent adaptability, good compatibility with cement and admixtures, good temperature adaptability, and good compatibility with different varieties of cement and admixtures The problem. 10. The product has good stability, no stratification or precipitation occurs in long-term storage, and no crystallization occurs at low temperature. Additives to make concrete stronger.
The product is green and environmentally friendly, does not contain formaldehyde, and is an environmentally friendly product. The economic benefits are good, the comprehensive construction cost of the project is lower than that of other types of products, and the cement can be saved by 15-25% under the same strength conditions.
Polycarboxylic acid high-efficiency water reducing agent is characterized by low dosage and high water reducing rate.