Material price analysis

The materials used in the technology of structural strengthening with carbon fiber are mainly carbon fiber cloth and bonding materials. Among them, the carbon fiber cloth used in China is currently mainly combined with bonding materials. The overall material price is higher or the same as that of general traditional reinforcement materials. In terms of bonding materials, the three bonding materials are required to have good bonding properties with the carbon fiber sheet used, and must match in terms of physical and mechanical properties. The resin bonding materials that can be cured at room temperature can be produced in China. At present, the price of carbon fiber cloth materials (including corresponding bonding materials) in the domestic market is about 500-1000 yuan per square meter depending on the type of material. The price of carbon fiber board materials (including corresponding knotting materials) is about 5,000 to 8,000 yuan depending on the type of material. Compared with the more commonly used bonding steel reinforcement method, the material price is higher, especially the price of carbon fiber board is much higher. However, carbon fiber reinforced materials are slightly more expensive, but the later maintenance costs are lower, and the overall benefits are much better than other reinforcements.

Horse construction is the largest and most professional carbon fiber product manufacturer in China. It is a company integrating R&D, production, sales and service.  Our main structural reinforcement materials are carbon fiber product(carbon fiber fabric&plate)and various adhesive applied to structural reinforcement. Five carbon fiber fabric production lines, using the world's most professional machine for weaving carbon fiber fabric-German DORNIER loom, with a daily output of 10,000 square meters of carbon fabric and an annual output of 4 million square meters.  Two carbon fiber plate production lines are also used on German Dornier looms, with a daily output of 2,000 meters of carbon fiber plates and an annual output of 600,000 meters. 5 structural epoxy glue production lines, with a daily output of 20 tons and an annual output of 6000 tons.

Construction analysis

During the construction of reinforced concrete structures with carbon fiber sheets, due to the light weight of the materials (the commonly used carbon fiber cloth is only 200-600g/m²), packaging, transportation, storage and construction are all convenient to rent. Compared with other reinforcement methods, it has great advantages in construction performance.

1) Short construction period

Carbon fiber cloth reinforced concrete structure does not require large machinery and equipment. Under the premise of ensuring the quality of construction and no accidental interference, the time required under the same conditions is 1/2 of the time required by the large-scale application of steel plate bonding methods in China. Under the condition of good construction organization in China, 10 working days can complete 1,000 square meters of work. The finished carbon fiber cloth is a kind of fabric, its width can be 20, 30, 50 cm, and the length is 50-100 m, and it is packaged in roll form. When used in the field, it can be cut arbitrarily with scissors or blades as needed, unlike steel plates that require special cutting tools. According to relevant statistical data, the same method of sticking reinforcement, sticking carbon fiber cloth is 4-8 times the work efficiency of sticking steel plate.

2) Small construction disturbance

The construction of the carbon fiber cloth reinforced structure can be implemented in a small space, except that the dust during the concrete surface treatment needs to be controlled, and there is almost no interference with the normal use of general structures. When the bridge and road are reinforced with carbon fiber cloth, the traffic can be uninterrupted.

3) The construction quality is easy to guarantee

The construction and operation of carbon fiber cloth reinforced concrete structure technology is convenient. Under normal construction conditions, the effective bonding area of carbon fiber cloth can basically reach 100%. And the on-site inspection is convenient, even if there is a small hollow drum, it can be remedied by the needle injection method, and the construction quality can be effectively guaranteed.

Due to the short construction period and high efficiency of carbon fiber cloth reinforced concrete structure, the materials are processed manually on site. There is no loss of large and medium-sized equipment. The detection is convenient and fast, and the construction can be carried out in a small space at the same time, which basically does not affect the normal use of the structure, and the construction is convenient. The construction period is very short, and most of the shapes of various structural members can be reinforced by this method. At the same time, due to the relatively light weight of the material, the structure does not increase the weight of the structure after reinforcement, and does not change the appearance size and shape of the structure. Compared with other reinforcement methods, it saves a lot of mechanical labor costs, labor costs and inspection costs.

Maintenance cost analysis

Durability and corrosion resistance are important indicators for evaluating the quality of a structural engineering. Especially for some buildings with special requirements, such as coastal buildings, buildings that are often corroded by harsh chemical environments (chemical plants) and some buildings that are eroded by radiation (nuclear power plant buildings and nuclear waste storage containers). Anti-corrosion and anti-radiation (aging resistance) have become important considerations for this type of structural design. Therefore, everyone pays great attention to the durability of carbon fiber materials and their composite materials.

The carbon fiber cloth material itself and the composite formed with the bonding material have good corrosion resistance under various environmental conditions. It can resist the effects of acid, alkali, salt and atmospheric corrosion commonly encountered in buildings, and also has good fatigue resistance. The carbon fiber cloth material itself can protect the internal concrete structure. The durability of the concrete structure itself is greatly improved, and the role of double reinforcement and repair is achieved. After the completion of the reinforcement construction, certain protective measures can be taken to meet the engineering requirements. The basic maintenance work can be reduced by at least 1/2 or more than other reinforcement methods, and the maintenance cycle can be greatly extended, thereby greatly reducing maintenance costs.

Comprehensive performance analysis

Taking into account the construction cost of the engineering structure, not only the one-time investment in its completion, but also the maintenance cost during the service life should be included. From a comprehensive point of view, the carbon fiber cloth reinforced structure technology has greater advantages. Based on the above three factors, we can say that the performance-to-price ratio of the carbon fiber cloth reinforced concrete structure technology is higher than that of the traditional external bonding reinforcement method, and the scientific and technological content is high.

For example, compared with the steel-bonded reinforcement method that has been widely used in China, carbon fiber cloth reinforcement technology has obvious advantages. The cost of the integrated platform of the carbon fiber cloth reinforcement unit project is basically the same as that of the bonded steel reinforcement method, but other aspects are better than the steel reinforcement method. The overall benefit is obviously better than the bonding steel reinforcement method. Have a complete understanding of the comprehensive engineering economic performance of the carbon fiber sheet reinforcement concrete structure technology. With the further advancement of the localization of carbon fiber cloth, its engineering cost can be reduced to a lower level than the steel-bonded reinforcement method, and it will have a competitive advantage that the steel-bonded reinforcement method cannot match. In addition, the use of this technology in construction has little impact on the environment. The requirements of Futai modern engineering construction on construction technology are conducive to environmental protection. In the long run, this technology will dominate the field of structural reinforcement.