The team of Professor Xu Shihua from Zhejiang University School of Architecture and Engineering has developed a high-toughness fiber-reinforced concrete material with high toughness, crack control, and durability. The tensile deformation capacity can reach 800 times that of ordinary concrete. This achievement won the second prize of the 2018 National Technology Invention Award on the 8th.
“Brittleness and easy cracking are the natural properties of ordinary concrete.” Xu Shichen said that concrete is widely used in infrastructure construction, and China’s usage is among the highest in the world. Concrete cracks will reduce the life of large-scale projects, cause large economic losses, and even cause major Security incident.
“Our invention completely solves the fundamental defects of concrete, which are strong, not tough, and brittle.” Xu Shizhen introduced that the ultimate tensile strain of high-toughness concrete can reach 8.4%, which is 800 times higher than ordinary concrete. . Unlike ordinary mortar and concrete, which are prone to brittle fracture, the maximum crack width of high-toughness concrete is far less than 0.1mm, which meets the requirements of corrosion resistance and durability under severe conditions.
The research team also conducts large-scale systematic tests on indicators including material mechanical properties, durability and structural performance. The results show that the comprehensive indicators of high toughness concrete deformation capacity and strength are 70% and 60% higher than the best international data, respectively.
At present, high-toughness concrete has achieved large-scale industrial production, and has been applied to major infrastructure projects such as Zhejiang Xinling Tunnel and Changshan Port Super Bridge.
“This achievement has formed a technical system with great innovation value, with independent intellectual property rights, and has been verified by engineering.” Said Miao Changwen, a member of the Chinese Academy of Engineering and a professor of Southeast University, said that improving the crack resistance and performance of concrete can further extend concrete buildings Life, especially for major projects.
It is understood that Xu Shizhen’s team has begun to explore the impact dynamic performance of high-toughness fiber-reinforced concrete materials and their composite structures in order to provide new scientific and technological achievements for the safe service of major engineering structures.