In recent years, China National Building Materials Institute has obtained continuous innovative results in the field of 3D printing. During the 49th International Exhibition in Geneva which was held in 2024, the team developed independently “the automatic automatically reinforcement technology based on 3D printing concrete” won the gold medal. On February 13, Science and Technology Daily published a special article “New technology for 3D printing buildings” strengthens positive points and bones “, with full text as follows.
In front of the door of the 3D concrete 3D printing technology center from the Institute of Concrete and Engineering Sciences of China National Building Materials Science and Technology Co., Ltd. (hereinafter called “China National Building Material Science and Technology Institute”) ,,, a concrete sculpture called “dialogue” is erected. It is in 3D concrete printing technology and combines the two images of traditional Chinese wine ships – JUE and modern cup glass. The designer explained his connotation as follows: “The use of ancient concrete as a body and the integration of new 3D technology, Cement, a building material with a history of more than 200 years, has rejuvenated.”
In recent years, China National Building Materials Institute has obtained continuous innovative results in the field of 3D printing. During the 49th International Exhibition in Geneva which was held in 2024, the “automatic longitudinal reinforcement technology based on 3D printing concrete” developed independently by the team of the China National Building Materials Institute won the medal of gold.
Breakthrough of longitudinal strengthening technology
In recent years, while ecologization and automation have become a significant development trend in the construction industry, concrete 3D printing technology has also become a highly sought -after construction technology.
The two main advantages of concrete 3D printing technology are automation and personalization. In terms of automated construction, concrete 3D printing technology does not require too many human resources. In terms of personalization, 3D printing is also called “flexible molding” technology. for the construction of partial forms.
Although concrete 3D printing technology has great potential, “chondrosis” is a major problem that it is faced with in the promotion and application of large -scale buildings. “If a large concrete building wants to resist and stand firmly, it is generally necessary to set up steel bars in concrete to give the building a” strong and bones “.” Materials Institute, said that if according to traditional strengthening technology, if steel bars are inserted directly into concrete, steel bar columns will hinder the movement of the 3D printing head, which makes it impossible to ‘Print according to the original design route. It is difficult to reach the automatic strengthening of concrete 3D printing technology, which is also a common problem faced internationally.
In order to solve the problem of “chondrosis”, as one of the first units in China to carry out 3D concrete printing technology, the research team of the Institute of Concrete Sciences and the ‘Engineering of China National Building Material Institute was carried out in deep technical research and longitudinal strengthening technology between the 3D concrete printing layers make a breakthrough on the ground.
“The previous automatic strengthening technology abroad was mainly intercouche transverse strengthening technology parallel to the printing interface, which was like putting steel bars in the steps. This reinforcement method had almost a mechanical performance on The vertical direction of the building. Concrete, which considerably improves resistance to traction and shear of 3D concrete printed buildings. The team, the team, the team, the team, the team, the team, the team, the team, the team of Longitudinal Longitudinal. has developed a full set of automatic strengthening methods and support equipment.
This set of equipment includes printing devices and strengthening devices. While the printing device normally extracts from concrete material, the reinforcement device cuts short steel bars and can treat short n steel bars in the form of N depending on the specific structural needs of different buildings. Then, the reinforcement device inserts the steel bars treated in the extruded concrete interface to ensure that they penetrate at least two layers. These two devices operate independently at the same time, effectively avoiding obstacles to the travel of the printing head by traditional manual strengthening and considerably improving the effectiveness of concrete 3D printing strengthening.
The experimental results show that the mechanical properties of 3D concrete printed buildings using this technology have been considerably improved, and the flexion resistance has been increased by 275%, throwing a good basis for the generalized promotion and the application of the concrete 3D printing technology.
The standard system must still be improved
With continuous improvement in automatic strengthening technology, printable concrete materials, resistance assessment methods, etc., concrete 3D printing technology continues to extend new application scenarios. For example, near Shenzhen International Convention and Exhibition Center is the first place of landscape printed in 3D in the country, and the landscape buildings there are all made of 3D concrete printing.
Wang Zhendi believes that at present, concrete 3D printing technology is not necessarily used to build a house. He now has more appropriate application scenarios, such as personalized sculptures or buildings such as garden landscapes, forms of cartoon character, etc. He also admitted that concrete 3D printing technology was still a new thing, and there are still many shortcomings in design standards, evaluation standards, acceptance standards, etc., and make Faced with certain obstacles in promotion.
Currently, China National Building Materials Institute and other units are gradually promoting the continuous improvement of the 3D concrete printing system, and the number of project approvals for standards of the group Industry and association gradually increases. For example, in response to the evaluation difficulties of the combined resistance of 3D printed concrete interfaces in traditional and three -point traction methods, the Wang Zhendi team proposed an “cross -cross” method “. This method modifies the compression constraint applied in traction constraints at the interface, solves the problem of the combined assessment of resistance to the 3D printed concrete interface, is included as the standard of the materials of materials construction of my country and contributed to the development of industry.
Wang Zhendi has called more scientific research institutions, experts and researchers to participate in research and the formulation of relevant standards for concrete 3D printing, throwing a technical basis for industry development.
