Concrete is a complex system. Changes in any component will not only affect the performance of the concrete, but also affect the effect of the water-reducing agent. This article starts with raw materials such as admixtures and aggregates in concrete and introduces the impact of raw materials on the effect of water-reducing agents. It is hoped that it will be beneficial to the safe and efficient application of water-reducing agents. In the process of preparing water-reducing agents, have you encountered the problem of differences in product performance? What do you think when you encounter such problems? The following is a summary of the five aspects that affect the performance of water-reducing agents:
In the process of preparing water-reducing agents, have you encountered the problem of differences in product performance? What do you think when you encounter such problems? The following is a summary of the impact on the performance of water-reducing agents. Five aspects:
1. The impact of temperature on product performance
Under the same conditions, use different temperatures to heat and insulate the sample to obtain the net result of the product. The fluidity of the slurry (0mm and 225mm respectively. This shows that the temperature has a great influence on its reaction.
2. The impact of the mix ratio of different raw materials on product performance
After determining the temperature, Through analysis, it can be quickly discovered that the water-reducing property of the mother liquor is mainly provided by the macromonomer, because the carboxyl group in the macromonomer molecule has a hydrophilic effect on polyethylene glycol and its derivatives. According to the water-reducing property of the macromonomer, we The dosage will be increased, so that the fluidity of the sample slurry produced in this way is 240mm (0.4%). It is easy to see the water-reducing effect of the large monomer in the synthesis.
3. Different processes Impact on product performance
Based on the characteristics of organic synthesis: different dropwise addition methods produce different products, because there are many side reactions in organic reactions. For this reason, changing them when other conditions are the same The fluidity of the clean slurry obtained by the process is 275mm (0.4%). From this we can get that when other conditions are fixed, we can consider changing the process to achieve cost savings.
IV. Chain The impact of transfer agent on product performance
The addition of chain transfer agent is mainly to control the molecular weight distribution that is too large and cause the molecular weight distribution to be too wide, and to prevent cross-linking. If too much is added, the molecular weight will definitely decrease, thus The water-reducing effect becomes worse and the fluidity of the clean slurry becomes smaller. In order to obtain a product with better effect, we will fine-tune the chain transfer agent to achieve the best effect.
5. Carboxylic The impact of acid monomers on product performance
Acrylic acid will play an indelible role in forming a complex between the carboxyl group in the main chain of the repeating unit and calcium ions. The complex formed has greater solubility It provides conditions for the continuous hydration of cement, so it has a great impact on the fluidity of the paste and the early strength of concrete. However, excessive dosage will cause too much dissolved matter to wrap up the undissolved matter, thus It blocks its hydration rate and accordingly affects the water reduction rate and early strength of concrete.</p
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