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Flexible Adhesive in Composite-to-Brick Strengthening-Experimental and Numerical Study
Arkadiusz Kwiecień1, Piotr Krajewski2, Łukasz Hojdys3
1Institute of Structural Mechanics, Cracow University of Technology, 31-155 Cracow, Poland. arkadiusz.kwiecien@pk.edu.pl.
Polymers
|April 11, 2019
Summary
Flexible adhesives in composite-to-brick strengthening systems, like polyurethane and epoxy resins, improve load capacity on brittle substrates. These systems reduce stress concentrations for enhanced structural performance.
Area of Science:
- Materials Science
- Civil Engineering
- Structural Engineering
Background:
- Composite strengthening systems are increasingly used in construction.
- Flexible adhesives offer potential advantages over traditional stiff adhesives.
- Understanding adhesive behavior is crucial for optimizing structural performance.
Purpose of the Study:
- To investigate the effectiveness of composite-to-brick strengthening systems using flexible adhesives.
- To compare the performance of polyurethane and epoxy-based flexible adhesives.
- To analyze the stress distribution and load-carrying capacity of these systems.
Main Methods:
- Single lap shear test (SLST) was performed on specimens.
- Linear Variable Differential Transformer (LVDT) and Digital Image Correlation (DIC) were used for measurements.
- Experimental data was used for numerical analysis of a 3D model with hyper-elastic adhesive representation.
Main Results:
- A strong correlation was observed between LVDT and DIC measurements.
- Composite systems with flexible adhesives showed superior performance on brittle substrates compared to stiff ones.
- Flexible adhesives effectively reduced stress concentrations and improved stress distribution.
Conclusions:
- Flexible adhesives enhance the load-carrying capacity of composite-to-brick strengthening systems.
- These systems are particularly effective on brittle substrates due to improved stress management.
- The study validates the use of flexible adhesives for structural strengthening applications.
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