Liu Dazhi, Cheng Nantong and Pang Keqiang all nodded frequently, it seems that they did not choose the wrong person, although Li Ruoyu is a little young, let him be the director of this concrete technology research and development center, they are also under great pressure, of course, this pressure is not from above, but from below. Anyone would think, this Li Ruoyu became the director of the concrete technology research and development center at such a young age, is this a relationship? Fortunately, Li Ruoyu's ability to show Xiàn recently is not as high as it can be, so the three of them are very relieved, and having Li Ruoyu in this concrete technology research and development center may become their political achievements.

Pang Keqiang is the section chief in charge of building materials, and he is also an expert in building materials, so he is more concerned about what the main research and development direction is after the establishment of the concrete technology research and development center. So Pang Keqiang said with a smile: "Comrade Ruoyu, tell me about it, after the establishment of our concrete technology research and development center, what concrete technologies should be studied?" ”

Li Ruoyu said without hesitation: "As the most important construction engineering material, there are many varieties of concrete. But as far as our large-scale ready-mixed concrete is concerned, I think our concrete technology R&D center should focus on high-performance concrete, and also carry out the research and development of some special concrete, such as lightweight aggregate concrete, permeable concrete, decorative concrete, and so on. Of course, our focus is on high-performance ready-mixed concrete, which is the most used concrete and the most promising concrete. ”

Pang Keqiang nodded and said: "Indeed, high-performance concrete is still a blank in my country!" Our Concrete Technology R&D Center has put it at the forefront of its research and should be the right choice! I couldn't agree more with you! With the acceleration of China's reform and opening up and modernization, the scale of construction in China is increasing day by day, how to ensure the quality of construction projects at the same time, but also to make the project can be used safely for a long time, has increasingly attracted widespread attention from governments at all levels and all walks of life. Whether concrete can be used as the most important building structural material for a long time, it must have high strength, high workability, high durability and other properties, so high-performance concrete is the inevitable result of the development of modern concrete technology and the development direction of concrete. China's buildings are developing towards high-rise, large-scale and modernization, and high-performance concrete will become an important building engineering material. ”

Liu Dazhi was also interested, and he hurriedly said: "Comrade Ruoyu, tell me what is the development status of this high-performance concrete?" How does our Concrete Technology R&D Center conduct research on high-performance concrete? ”

Li Ruoyu said loudly: "Okay, leaders, I'll just talk about it briefly." High-performance concrete is a new concept of concrete proposed by some developed countries based on the durability design of concrete structures, which takes durability as the primary design index, and this kind of concrete has the potential to provide a service life of more than 100 years for infrastructure projects. Different from traditional concrete, high-performance concrete is the most comprehensive concrete due to its high durability, high workability, high strength and high volume stability and many other excellent characteristics, and has its unique advantages in important projects such as bridges, high-rise buildings, and harbor buildings, and will have obvious benefits in terms of project safety period, economic rationality, and adaptability to environmental conditions. In 1990, the United States first proposed high-performance concrete, which was recognized by countries and experts around the world, and the French government organized government research institutions, colleges and universities, construction companies and other units to carry out research on high-performance concrete. Therefore, our country should also keep up with the pace of the development of concrete technology in the world in this regard! In this way, it is possible to achieve the leapfrog development of concrete technology and even construction engineering technology, from looking at it to keeping pace with it, and finally leading the development of concrete technology in the world. ”

Seeing that Liu Dazhi and the other three leaders listened very seriously, Li Ruoyu immediately felt inspired and began to continue talking: "Cement and concrete can be called the most consumed materials in the world, especially in my country. China has a large number of people and little land, lacks resources, and is also a big energy consumer in the world, especially with the development of the economy, the contradiction will become more prominent. The large use of concrete requires a large amount of cement, and the production of cement greatly affects the environment and directly affects the lives of future generations, so the development of green and high performance is imperative. The research and use of green high-performance concrete not only protects the environment, but also improves the performance of concrete. Taking fly ash as an example, the research on fly ash as an admixture for high-performance concrete, especially high content fly ash, is particularly important. Fly ash is an industrial waste, if not well utilized, it will cause secondary pollution to the environment, the use of fly ash in green high-performance concrete, that is, to solve the secondary pollution, and reduce the cost of concrete, while improving the performance of concrete, the main table is to improve the durability and workability of concrete. Concrete should be mixed with industrial waste residue admixture, save more cement, and have higher strength and durability. I think the research of high-performance concrete is of great significance for the sustainable development of China's economy and society. ”

"The research on high-performance concrete should be carried out from both theoretical and practical aspects. First of all, the durability of concrete structures, we should put forward the theory or empirical model of material performance deterioration through guò theoretical research, or the theoretical model of the service life of concrete structures, and we should carry out several high-performance concrete application research, including green high-performance concrete, high-strength lightweight concrete, fiber-reinforced concrete, self-compacting concrete and intelligent concrete. In order to better continue to optimize the theory and design of high-performance concrete. Li Ruoyu said eloquently.

Pang Keqiang said excitedly: "Comrade Ruoyu, you said it so well!" This allows us to see that the future of concrete is full of broad prospects! However, for our ready-mixed concrete, high-performance concrete also faces many problems, which need to be solved step by step. For example, the distance from the mixing plant to the construction site is relatively far from our ready-mixed concrete, so it is necessary to ensure that the slump loss of high-performance concrete is not too large, and the pumping performance of high-performance concrete must also be good. ”

Li Ruoyu nodded and said, "Section Chief Pang, you're right. These are the problems that need to be solved in the research and development of high-performance concrete, but high-performance concrete cannot be simply understood as high-strength concrete, in addition to high strength, good working performance is also a must for high-performance concrete. ”