Fiberglass self-adhesive tape: an innovative solution for repairing building cracks

Introduction

Cracks in building walls are a long-standing problem in the engineering field, and traditional repair materials such as paper tape and ordinary mesh cloth have defects such as poor alkali resistance, easy aging, and complex construction. Fiberglass self-adhesive tape has become the core material for modern building crack repair due to its unique material structure and performance advantages. This article systematically analyzes its technological innovation value from three dimensions: material characteristics, construction technology, and application scenarios.

1、 Material Characteristics: Breakthrough in Multi Dimensional Performance

Alkali and corrosion resistance performance

Glass fiber self-adhesive tape is made of alkali free glass fiber as the substrate, and formed into a warp and weft mesh structure through a special weaving process. The acrylic copolymer coating coated on its surface has excellent alkali resistance and can maintain stable mechanical properties for a long time in the alkaline environment of concrete (pH 12-13). According to testing data from the National Fiberglass Quality Inspection Center, after soaking the material in a 5% sodium hydroxide solution for 90 days, the tensile strength retention rate still exceeds 92%, far exceeding the 15% attenuation rate of traditional paper tape.

High strength deformation resistance capability

By using the fixed technology of warp knitted synthetic yarn, the longitudinal breaking strength of the material can reach 1500N/5cm, the latitudinal breaking strength is 1200N/5cm, and the node peeling strength is increased to 22N/cm. In the utility model patent published in 2024, the improved horizontal and vertical interlaced structure enables the material to maintain a tensile strength retention rate of 85% after 30 freeze-thaw cycles, effectively solving the cracking problem of traditional materials under temperature difference deformation.

Self adhesive adhesion optimization

Using hot melt adhesive coating technology, the adhesive strength between the adhesive layer and the substrate interface reaches over 0.8MPa, and no auxiliary adhesive is required during construction. Fast adhesion can be achieved within the temperature range of -10 ℃ to 50 ℃ and humidity range of 30% -85% RH, especially suitable for crack repair on curved or irregular surfaces.

2、 Construction technology: Standardized process control

Base surface pretreatment

The crack width should be controlled within 5mm, and if it exceeds this size, it should be filled with quick drying repair mortar first. The construction surface needs to be clean and dry, with a moisture content of less than 8%. Oil stains and floating dust need to be cleaned with high-pressure air.

Adhesive tape bonding technology

Adopting the "three-step positioning method":

Step 1: Align the tape along the centerline of the crack and reserve a 5cm overlap length

Step 2: Use a dedicated roller to roll back and forth three times with a pressure of 3kg to ensure that the adhesive layer is fully penetrated

Step 3: Use a utility knife to cut off the excess part, with a cutting angle controlled at 45 °

post-treatment

Complete the first layer of putty scraping within 2 hours after pasting, with a thickness not exceeding 2mm. After drying, use 400 grit sandpaper to polish and then proceed with the second layer of putty construction. The final coating should cover the edge of the tape by at least 10mm to form a complete protective layer.

3、 Application scenario: Full domain coverage solution

new building

In the gypsum board ceiling system, as a reinforcing material at the joints, it can withstand a uniformly distributed load of 0.5kN/m without cracking. In prefabricated buildings, crack resistance treatment is used at the joints of prefabricated components to reduce the leakage rate of joints to below 0.3%.

Renovation of existing buildings

For the cracks on the exterior walls of old residential areas, the use of a composite reinforcement system of "mesh cloth+self-adhesive tape" can improve the impact resistance of the walls by three times. In the renovation of historical buildings, its 0.18mm ultra-thin design can maximize the preservation of the original appearance of the building.

Special environmental applications

In corrosive environments such as chemical workshops, materials have passed a 1000 hour salt spray test and show no signs of rust or blistering on the surface. In damp spaces such as subway tunnels, its water absorption rate is less than 0.5%, meeting the first level waterproof requirements.

4、 Technical and Economic Analysis

Taking the 1000 ㎡ wall repair project as an example:

Material cost: The unit price of glass fiber self-adhesive tape (50mm × 90m/roll) is about 12 yuan/roll, with a unit area consumption of 0.15 rolls/㎡ and a material cost of 1.8 yuan/㎡

Labor cost: The daily wage for skilled workers is 400 yuan, and the daily construction volume can reach 300 square meters. The labor cost is 1.33 yuan/square meter

Comprehensive cost: 3.13 yuan/square meter, reduced by 42% compared to traditional craftsmanship

Maintenance cycle: With a service life of over 15 years, the total lifecycle cost is reduced by 65%

Conclusion

Fiberglass self-adhesive tape has established a three in one crack management system of "prevention repair enhancement" through material innovation and process optimization. With the trend of building industrialization and green development, this material will play a greater value in areas such as ultra-low energy buildings and urban renewal, promoting the evolution of building maintenance technology towards standardization and intelligence.