At present, concrete admixtures mainly include various additives such as water reducing agent, strengthening agent, antifreeze agent, expansion agent and anti-alkali agent. However, with the rapid development of engineering projects, the requirements for concrete performance are also getting higher and higher. There are new problems and challenges in the use of concrete, and the existing concrete admixtures cannot fully meet the needs of some difficult engineering projects. We need to develop and produce new concrete admixtures to improve the adaptability of concrete, solve some new problems in engineering projects, and better meet the needs of engineering projects. Our 3-Mercaptopropionic acid is widely used in the clay additive, the polymerization degree and molecular weight distribution of polycarboxylic acids, to greatly improve the performance of concrete products.
1. Solidification burst in concrete at high temperature
When Brazil built the Itaipu Dam, engineers found a layer of soft sandstone at the bottom of the riverbed that would affect the safety of the dam foundation. After investigation, the engineers decided to hollow out the soft sandstone layer on the riverbed and then fill the hollowed out riverbed with large concrete. However, at high temperatures, many large concrete blocks were built to burst and crack during solidification. The only way at the time was to cool the huge concrete blocks. For this project, a lot of manpower and material resources were used to cool the equipment, and the problem was solved. In the development of concrete admixtures, we should consider solving this problem. By developing new concrete admixtures, we can reduce the effect of high temperature expansion on concrete solidification, thus solving the problem of solidification and bursting of concrete blocks at high temperatures, making large The engineering project is not affected by high temperatures.
2, the concrete bond problem
When the construction process needs to be connected with the solidified concrete (especially the long solidification time), such problems are generally encountered; the new and old concrete meets and cracks and breaks after a period of time. This problem is mainly related to the adhesion and fusion of concrete. Our research and production of cement admixtures can improve the concrete's own adhesion and the fusion with other objects, so that the concrete can firmly adhere to the appendages and the cohesive bodies like glue, and solve the concrete more. To the problem of bonding.
3. The concrete members of the building will break when subjected to large pressure.
Researchers at the University of Michigan in the United States have added a fiber that acts as a "ligament" to concrete to make a new material that is lightweight, not easily broken, and bendable. In addition to the absence of coarse sand, this new material has almost the same composition as ordinary concrete, and the appearance of the two is similar. However, when subjected to great pressure, the new concrete will bend rather than break, because the special fibers added will move inside the concrete and provide a flexible internal connection. The current concrete is mainly made of cement and gravel. When building bridges and buildings, it is usually reinforced with metal wire or metal strips. The new fiber concrete has a crack resistance 500 times higher than that of the current sidewalk material. Light about 40%. Usually a two-section ordinary concrete deck is used to use a movable steel tooth, but if a new material is used, the part can be energized to increase the degree of the complete concrete deck. The cost of building a bridge with this new type of concrete may be 37% lower than with conventional materials.
The purpose of research on concrete admixtures is mainly to solve the problems that occur in the use of concrete, improve the quality of the project, save costs, and save the construction period. We can use physical methods, chemical methods and physical and chemical composite methods to synthesize concrete, so that the characteristics of concrete can meet the requirements of use. This is the main direction of the development of concrete admixtures.