In the current construction industry, cement is a very common decorative building material, but in the process of using cement, cement expansion agent is also an indispensable raw material, which can make the cement quickly expand. To prevent the cement from condensing. It is generally widely used in public buildings. Because many people have not been exposed to cement expansion agents, they do not know much about their experience in using them. Next, we will explain to everyone whether the application of cement expansion agents is effective.
What is the effect of using cement expansion agent
Cement expansion agent is actually a chemical additive. When it is added to cement, when the cement solidifies and hardens, it will Expanding with the volume, it plays the role of compensating for the prestressed steel bars caused by shrinkage and tension of the steel bars and fully filling the cement voids. In fact, cement expansion agents actually use non-metallic materials (usually alumina powder, in recent years vermicelli, alumina powder, etc. have been used) to chemically change with alkaline cement, thereby producing radon gas, causing the cement volume to expand. It has the effect of improving the compressive strength of cement, so some people call it cement foam glue. The experience of using cement expansion agent is still very good, and the usage will become very economical. Generally accounting for 1% of the quality of cement, the following agents are used to improve the construction quality of concrete, thereby increasing the strength of concrete.
What are the technical properties of cement expansion agent
1. This product is a granular agent, which is non-toxic, odorless, flame-retardant and does not contain chlorine salts. It will not rust the steel bars. effect.
2. This product is added to concrete at the strongly recommended intake and will not have any obvious harm to the performance of fresh concrete.
3. With an intake of 8 to 10%, micro-swelling can also be created in the concrete, which can reduce the shrinkage of the concrete. When the minimum reinforcement rate is 0.2 to 1.0%, the concrete Limit its expansion coefficient to 0.020~0.040%, and create 0.20~0.040% in concrete, but create 0.2~0.7MPa self-stress in concrete, which can compensate for the shrinkage and drying of ambient temperature caused by the initial water-binder ratio of concrete. Shrinkage, which in turn can improve the impermeability grade and crack-resistant fiber properties of concrete.
5. The expansion agent has no adverse effect on the strength of the concrete. On the contrary, it can make the concrete film optically denser, which is beneficial to the later compressive strength of the concrete.
6. The impermeability grade of concrete mixed with appropriate expansion agents can exceed P20.
7. Expansion agent can increase the adhesion of concrete by 20 to 30%.
8. The expansion agent can significantly improve the corrosion resistance of concrete to potassium thiocyanate and the corrosion level of the sea surface.