Horse carbon fiber reinforced polymer(CFRP) fabric for structural strengthening of column, beam, slab, wall
Carbon Fiber Strengthening Video(click it)
>>The treatment of concrete surface
The cosmetic layer, oil, dirt etc. Of concrete surface should be chiseled off and then rubbed off 1 ~2 mm thick surface layer with the angle grinder, concrete components should be handled by chamfering on the corner, dust was blew out with compressed air after the completion Of polishing, and finally the surface was wiped by cotton cloth dipped in acetone, and kept dry for use. If the concrete needed to strengthen existed cracks, first choose HM-120M perfusion adhesive or HM-120L pouring crack adhesive to perfuse according to the size of crack, and then strengthen.
>>Primer construction
When construction, two components of HM-180 primer were weighed according to the stipulated proportion of preparing glue, and dumped into a clean container and stirred to uniformity (when mixing, best mix along the same direction to avoid the air from form ingair bubbles.) Brush or roller brush was used to evenly brush on the concrete surface, after the glue surface layer dried, it should be brushed several times depending on the particular circumstances, but the coating thickness did not exceed 0.4 mm, and it should not be missed out to brush, or have flowing or bubbles, waiting for glue curing (curing time was depended on the site temperature, it was appropriate when finger felt dry, generally not less than 2 hours), then the next process was proceeded. The glue prepared every time should be used up one time during the applicable period of the glue.
>>Leveling construction
The pores and defects on concrete surface were filled by HM-180CE leveling adhesive. When depression area was existed, the prepared leveling adhesive was used to repair and fill through scraper embedding and scraping, the position emerging altitude difference such as the joint of templates should be filled by leveling adhesive, which tried to minimize the height difference. The treatment of corner was that it was repaired to smooth arc through leveling adhesive, its radius was not more than 20mm. After the leveling adhesive cured (curing time was depended on the site temperature, it was appropriate when finger felt dry, generally not less than 2 hours), the next process should be proceeded further.
>>Paste of unidirectional carbon fiber fabric
HM-180C3P carbon fiber impregnated adhesive was smeared to the pasted area evenly, the corner site was more smeared appropriately. Paste after hauling unidirectional carbon fiber fabric tight and alignment, use a plastic scraper or roller (a paint roller that the villus was removed outside) to roll repeatedly along the same direction, until the glue compound exuded. And then smear impregnated adhesive to the outside surface of the carbon fiber fabric evenly, and roll repeatedly that the impregnated adhesive can immerse the carbon fiber fabric in two ways, if it is multi-paste, until your fingers touch dry, the next layer of paste can be beginner. If the carbon fiber fabric needs overlapping.
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>>Curing and conservation
Prevent rain or moisture 24 hours after the completion of construction, and pay attention to protection against a hard Object bumping into the surface of the construction. When the average air temperature is 20 , 25 ℃ , the curing time is not less than 3 days; when the average air temperature is 10 ℃, the curing time is not less than 7 days.
Carbon fibers are often woven into fabrics after they have been manufactured and sized. The manufacturing process begins by creating bundles of carbon fibers called tows. These tows are then rated according to the number of fibers or filaments they contain, which is commonly referenced as 3k, 6k, 12k, and 48k. The "k" stands for "thousand," meaning a 3k tow comprises 3,000 carbon filaments. Each strand of carbon fiber is only about 5-10 microns thick, but the high number of these strong carbon fibers in such a compact space gives carbon fiber materials incredible strength.
Carbon fiber spools are woven into fabrics on a weaving loom. The most common weaves are plain weave, twill, and harness satin.
Plain weave, or 1x1 weave, carbon fiber fabric is symmetrical and resembles a checkerboard. The tows are woven in an over/under pattern, offering tightly interlaced fibers which are highly stable. Fabric stability refers to a material’s ability to maintain its fiber orientation and weave angle. Because of its high fabric stability, plain weave carbon fiber fabric doesn’t work well for complex contours because it is not particularly flexible. However, it is easier to handle without creating distortions in the fabric. Therefore, it works well for flat sheets, tubes, and two-dimensional curves.
Crimp is the curvature of a single fiber in a weave, and plain weave carbon fiber fabric has a harsh crimp due to the tight interlaces in the tows. This harsh crimp can create stress points that cause areas of weakness over time.
Twill weave consists of a 2x2 or 4x4 pattern and is the most commonly recognized type of carbon fiber fabric. In a 2x2 weave, each tow passes over two tows and then under two tows. It stands to reason, then, that a 4x4 weave consists of each tow passing over four tows and then under four tows. This over/under weaving creates a distinct diagonal pattern The distance between the tow interlaces in a twill weave is longer than with a plain weave. Therefore, fewer crimps occur, allowing less opportunity for stress points to be created.
Twill weave is pliable and can form to complex contours while still maintaining good stability. It must be handled more carefully than a plain weave fabric to avoid adding distortions to the weave. A 4x4 weave is easier to form than a 2x2 weave, but it also has less fabric stability.
Satin weaves have been used for thousands of years to give silk fabric its beautiful draping quality while leaving the fabric smooth and seamless. When used for carbon fiber composites, satin weaves translate to an ability to easily form around complex contours. Obviously, this means satin weaves also offer less stability than other weaves.
The most common harness satin weaves are four harness satin (4HS), five harness satin (5HS), and eight harness satin (8HS). The number indicates the total number of tows passed over then under. For example, a 4HS weave consists of three tows passed over and then one passed under. For 5HS, four tows are passed over, and then one under, and 8HS is seven tows passed over and one under. The higher the satin weave number, the more formable and less stable it is.