Treatment of cracks in carbon fiber stone plate

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Stone row carbon fiber plate has been recognized by various industries, with the continuous development of science and technology, carbon fiber plate has been widely used in people's life. Familiar with most of its carbon fiber board in our lives are applied in the construction and industry, with the continuous development of science and technology in recent years, the carbon fiber board has grown to every aspect of our lives, the material characteristics of high quality carbon fiber board has been recognized by the industry, therefore, this advanced materials have been widely used in various fields of people in their lives.
Stone line of carbon fiber sheet is emerging in the 21st century high-tech composite materials, with high strength, light weight, good toughness, corrosion resistance, abrasion resistance, endurance, creep, seismic, stable performance, and many other advantages, more and more popular with the masses, has been widely applied in the proportion of remote control model plane/ship/car accessories, cell phone/glasses/jewelry such as surface decoration, fishing gear, fishing line wheel brake parts/rocker arm, sport equipment and high strength strengthening, etc.

The tensile strength of the stone row carbon fiber plate reinforced composites is generally higher than 3,500mpa, 7-9 times, and the tensile modulus of steel and 23,000-43000mpa is also significantly higher than that of steel. Therefore, the strength and density ratio of CFRP material is 2000Mpa/(g/cm3), and the strength of A3 steel is only 59Mpa/(g/cm3), and its elastic modulus is also higher than that of steel. Carbon fibers are currently classified into two categories: space class (aerospace class) and industrial class (commercial class), also known as small trailers (small strand tow and small tow) and large tow (large strand or large trailer tow). Usually large tow carbon fiber carbon fiber 48 K called 60 K, 120 K, 360 K and 480 K etc. Early aerospace grade carbon fiber with 1 K, 3 K, 6 K, and gradually developed into 12 K and 24 K, mainly used in high-tech and sports and leisure products, such as aircraft, missiles, rockets, satellites, fishing rods, golf clubs, tennis rackets, defense industries and so on. Industrial-grade carbon fiber is used in a variety of civil industries, including textiles, pharmaceuticals and health, electromechanical products, civil buildings, transportation and energy. In particular, in recent years, industrial-grade carbon fiber has penetrated into the traditional aerospace grade carbon fiber application field and begun to gain a certain degree of application in sports and leisure products, and this trend is expected to expand further.

The stone row carbon fiber board is used in a wide range of areas, so the problem is slowly emerging, the following co-creation to share some stone row fiberboard fracture treatment methods:

1 failure crack caused by unqualified cement stability

To the concrete in the cement stability unqualified or different varieties of cement mixed with chemical reaction caused by the failure of crack, must be thoroughly treated, that is, the concrete broke down and poured again.

2 cracks caused by stress

For the cracks caused by stress, specific reinforcement measures can be taken according to the reasons for the occurrence. For floor cracks that have affected the safety of the structure, in addition to chiseling v-shaped grooves along the seam to flush clean, epoxy resin solution with pressure into the seam to seal, but also with flat steel or carbon fiber fabric measures to strengthen the floor.

3. Cracks not caused by force

The treatment of non-stressed cracks caused by temperature, concrete shrinkage, construction and other factors is as follows:

(1) for cracks on the surface of general concrete slab, clean the surface crack first, and then fill the joint with epoxy resin glue or close it with surface coating. If the construction in the final coagulation before the discovery of cracks, you can wipe pressure treatment.

(2) general crack (width between 0.05~0.2mm) treatment, the treatment order is: after cleaning the plate joint with 1:2 or 1:1 cement mortar to wipe the joint, flat curing, closed to restore the look and feel. (only for joints with a small number of joints and no through-length joints)

(3) if the crack is large, the general width is greater than 0.2mm, it should be chiseled into an eight-shaped groove along the crack, and after rinsing, smooth it with 1:2 cement mortar, or adopt epoxy resin cement mortar for inlay. (only for joints with a small number of joints and no through-length joints)

(4) when the floor slab has a large crack area, static load test should be conducted on the floor slab to check its structural safety. If necessary, a layer of steel mesh should be added to the floor slab to improve the integrity of the board.

(5) long and penetrating dangerous structural cracks with a crack width greater than 0.2mm shall be treated by cutting v-shaped grooves along the joints and rinsing them clean, pouring epoxy resin solution into the joints with pressure to seal them, and reinforcing the floor slab with flat steel or carbon fiber cloth.

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