Study on the mechanical properties of glass fiber self-adhesive tape in structural reinforcement

Introduction

In the reinforcement of existing building structures, traditional carbon fiber cloth and steel plate reinforcement have problems such as complex construction and high cost. Fiberglass self-adhesive tape has become an emerging choice in the field of structural reinforcement due to its lightweight, high strength, and easy construction characteristics. This article systematically explores its mechanical properties and reinforcement effects through theoretical analysis and experimental research.

1、 Analysis of Material Mechanical Properties

constitutive model

Glass fiber self-adhesive tape behaves as a linear elastic material, and its stress-strain relationship conforms to Hooke's law:

σ = E·ε

Among them, the elastic modulus E=70GPa, Poisson's ratio ν=0.22

Tensile performance test

The test was conducted according to the GB/T 1447-2005 standard, and the results are as follows:

Tensile strength: 1500MPa (warp direction), 1200MPa (weft direction)

Elongation at break: 3.2% (longitudinal), 2.8% (latitudinal)

Elastic modulus: 68GPa (meridional), 65GPa (latitudinal)

Study on Shear Performance

Using the double shear test method, the adhesive shear strength was measured as follows:

Interface with concrete: 2.5MPa

Interface with steel: 3.2MPa

Interface with wood: 1.8MPa

2、 Numerical simulation of reinforcement mechanism

Establishment of Finite Element Model

Using ABAQUS software to establish a 1:1 scale model and simulate the stress process of reinforced concrete beams with self-adhesive tape. The model parameter settings are as follows:

Concrete: C30, elastic modulus 30GPa

Self adhesive tape: thickness 0.18mm, elastic modulus 70GPa

Adhesive layer: thickness 0.1mm, elastic modulus 1GPa

stress distribution law

When loaded to the ultimate load:

Maximum tensile stress at mid span of concrete beam: 2.8MPa (unreinforced), 1.5MPa (reinforced)

Maximum tensile stress of self-adhesive tape: 1200MPa (not reaching failure strength)

Maximum shear stress of adhesive layer: 2.2MPa (less than shear strength)

Capacity enhancement effect

The simulation results show that using single-layer self-adhesive tape reinforcement can increase the bending capacity of the beam by 42% and the stiffness by 28%.

3、 Experimental verification and comparative analysis

Experimental Design

Produce 6 concrete beams (300mm × 150mm × 1500mm), divided into two groups:

Control group: Unreinforced beams

Experimental group: Single layer self-adhesive tape (width 50mm, length 1200mm) pasted at the mid span

Loading system

Using four point bending loading, with a span of 1200mm and a loading speed of 2mm/min, until failure.

experimental result

Improvement rate of parameter control group and experimental group

Cracking load (kN) 12.5 18.2 45.6%

Ultimate load (kN) 25.3 36.8 45.5%

Deflection (mm) 18.2 12.5-31.3%

Observation of crack morphology shows that the number of cracks in the experimental group decreased by 60%, and the maximum crack width decreased from 1.2mm to 0.4mm.

4、 Engineering application cases

Reinforcement project of a certain factory building beam

A single story industrial plant requires reinforcement of the main beam due to increased equipment load. Adopting self-adhesive tape reinforcement scheme, the construction period is only 3 days, which is 60% shorter than traditional carbon fiber cloth reinforcement. After reinforcement, the bearing capacity of the beam meets the design requirements, and no new cracks have appeared after 2 years of monitoring.

Reinforcement of masonry structure in a certain school

To address the issue of wall cracking in the teaching building, a composite reinforcement system of "self-adhesive tape+high-strength mortar" is adopted. After reinforcement, the shear strength of the wall increased by 75%, and the displacement angle between layers under earthquake action decreased from 1/550 to 1/1200, meeting the seismic fortification requirements.

A bridge pier column reinforcement project

In coastal corrosive environments, galvanized glass fiber self-adhesive tape is used to reinforce bridge piers. After 5 years of wave erosion, the integrity rate of the reinforcement layer remained at 100%, while traditional steel plate reinforcement showed severe corrosion.

5、 Technical standards and construction specifications

Material performance requirements

Tensile strength: ≥ 1200MPa

Elastic modulus: ≥ 60GPa

Elongation at break: ≥ 2.5%

Adhesive shear strength: ≥ 2.0MPa

Key points of construction quality control

Base treatment: Concrete surface roughness Ra ≥ 3.2 μ m

Overlap length: ≥ 200mm

Rolling pressure: Use a 50kg roller to evenly roll and compact

Maintenance time: Avoid vibration within 7 days after pasting

6、 Development Trends and Prospects

Intelligent monitoring integration

Developing a self-adhesive tape with built-in fiber Bragg grating sensors that can monitor the stress-strain status of reinforced structures in real-time. Preliminary testing shows that the system has an accuracy rate of 95% in identifying micro strains of 0.1 μ ε.

Multi functional composite materials

Developing viscoelastic self-adhesive tape with damping function can shorten the attenuation time of structural vibration by 40%. The laboratory stage product has achieved a loss factor tan δ>0.3.

3D printing customization

Based on BIM technology, parametric design can produce irregular self-adhesive tapes that fully adhere to structural surfaces. The pilot project shows that this technology reduces material waste rate from 15% to 3% and improves construction efficiency by 50%.

Conclusion

Fiberglass self-adhesive tape provides an efficient and economical solution for structural reinforcement through material innovation and process optimization. With the advancement of materials science, this technology will play a greater role in seismic reinforcement, historical building protection and other fields, promoting the structural reinforcement industry towards intelligence and precision