Why are admixtures used in concrete? Do you know the reasons?

The application of commercial concrete has been basically popular in our country. The application of admixtures has also accelerated the development of concrete technology. Admixtures have also solved various technical problems in the application of concrete. We can all see the presence of admixtures in the concrete construction process. The performance of concrete is determined by the proportion of cement, sand, gravel and water. In order to improve a certain property of concrete, the proportion of raw materials can be adjusted. In order to increase the fluidity of concrete, the amount of water can be increased, but this will reduce the strength of the concrete.

1. A key parameter of the concrete mix ratio is the water/cement ratio, that is, the ratio of water/cementary material (cement + active mineral mixture). The higher the water/glue ratio, the better the workability of fresh plastic concrete and the easier it is to construct, but the lower the strength of hardened concrete. In order to solve this contradiction, that is, to increase the strength without sacrificing workability, or to reduce the cement dosage while maintaining workability and strength, it is necessary to add an external water agent.

　2. Why are admixtures used in concrete? On the one hand, in order to improve the early strength of concrete, the amount of cement can be increased, but in addition to increasing the cost, this may also increase the shrinkage and creep of concrete. The use of admixtures can avoid the above-mentioned defects. When it has little effect on other properties of concrete, the use of concrete admixtures can greatly improve certain properties of concrete.

Through the above description, we can understand why admixtures are used in concrete? Now you should have a clear understanding of some of the functions that admixtures can play in concrete. Adding admixtures to concrete can effectively reduce the amount of cement, reduce costs in the production process, and improve the working performance of concrete.

In the polycarboxylic acid mother liquor, we can appropriately add high-efficiency anti-mud monomers

Product description

The high-efficiency anti-mud monomers are from Qingdao Dingchangxin A functional monomer independently developed by Materials Co., Ltd. and used in the synthesis of polycarboxylic acid mother liquor. This product is an unsaturated monomer that can be used for free radical polymerization, synthesized using organic synthesis technology based on the concept of molecular design. Its molecular structure is different from both unsaturated alcohol polyoxyethylene ether (large monomer) and small monomers such as acrylic acid, hydroxyethyl acrylate, sodium methylallylsulfonate, etc. It can be adsorbed on gelling materials The particle surface plays an “anchoring” role and can also act as steric hindrance.

Product performance

Using this product in the synthesis of polycarboxylic acid mother liquor can optimize the molecular structure of the polycarboxylic acid mother liquor, and provide the polycarboxylic acid mother liquor with slump-preserving, mud-resistant, and light-reducing properties. Water and other different functions.

How to use

1. Replace the macromonomer in the original process according to the ratio of 1:1, with a total replacement amount of 10-40 kg. According to the experimental conditions, adjust the initiating system and the amount of chain transfer agent.

2. In specific use, it can be added dropwise together with the small monomers, or part of it can be placed in the base material, and the rest can be added dropwise.

3. In order to obtain the best use effect, it is necessary to appropriately adjust the dosage of the initiating system and chain transfer agent based on the original process, thereby optimizing the molecular structure of the polycarboxylic acid.

4. If 1:1 replacement has good adaptability, you can also try 1:1.5 or 1:2 to replace the large monomer in the original process. </p