Applied to fatigue cracks in steel structures to prevent the propagation of fatigue cracks
AT380ST is a solventless epoxy resin adhesive that fills fatigue cracks in steel structures with a simple injection method. It penetrates and adheres well to the tip of the fatigue crack, preventing the growth of the fatigue crack. Early and high strength can be obtained under all conditions such as dry and wet conditions.
Use
- Crack penetration including micro-rack in steel structures.
Features
|
Excellent penetration |
It also penetrates upward and sideways by capillary action. |
|
High adhesion and durability |
It has excellent adhesion performance not only on dry surfaces but also on wet surfaces. In addition, it shows high tensile strength and bending strength, and has excellent durability. |
|
Low shrinkage |
Since it contains almost no solvent, there is almost no cure shrinkage, and no load is applied to the applied frame. |
|
High security |
It emits no toxic gas during combustion and can be applied inside buildings. |
Properties (20 ℃) Properties of uncured material
|
|
Main ingredient |
Curing agent |
|---|---|---|
|
Main component |
Modified epoxy resin |
Modified aliphatic polyamine |
|
混合比（重量比） |
100 |
43 |
|
Mixing ratio (volume ratio) |
2 |
1 |
|
Test items |
Test method |
Main ingredient |
Curing agent |
Mixture |
|---|---|---|---|---|
|
混合比重 |
JIS K 6833 |
1.15±0.05 |
1.00±0.05 |
1.11±0.05 |
|
Mixing viscosity (mPa · s) |
JIS K 6833 |
800 ± 100 mPa ・ s |
300 ± 50 mPa ・ s |
450 ± 100 mPa ・ s |
|
Usable time |
Temperature rise method |
40 minutes |
||
Construction procedure
|
1 |
Crack investigation and marking |
Check the condition, width and length of the crack. |
|
2 |
Crack cleaning |
Clean cracks with air spray. |
|
3 |
Epoxy resin injection |
Inject the static mixer tip against the crack. |
|
4 |
Infiltration and filling of cracks |
The resin injection is repeated within the pot life of the material while visually checking the penetration into the crack. |
|
5 |
Curing curing |
Strive for hardening and curing to avoid impact. (About 24 hours) |
使用方法
- Remove dust, oil, etc. from the construction surface.
- Measure the main agent and curing agent at a ratio of 2: 1 (by volume) and stir well while paying attention to air entrapment.
- Mix at once so that it can be used up within the pot life.
- Please work in an environment of 5 ℃ or more.
Achievements (sales / construction / introduction)
2020年度：2ℓ
2021年度：1ℓ
2022年度：1ℓ
