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In the process of implementation, the girders that have been installed can experience corrosion. This is certainly an obstacle to the sustainability of the project as well as adversely affecting the durability of the building structure. Generally, girder loss can be caused by material failure.
What are the stages of repairing these porous girders? Check out the full article below!
Stage of Repair of Porous Girder
The following are the stages of repairing porous girders:
1. Preparation of Tools and Material
In order for the repair process to run well, make sure that the equipment to be used is in excellent condition and functioning well. As example, a number of tools and materials needed are as follows:
| Tools and Material | Quantity | Spesification |
| Bucket | Min 3 Pcs | Min. Capacity 5 L |
| Hammer | Min 1 Pcs | – |
| Chisel | Min 1 Pcs | – |
| Grout Mixer | Min 1 Pcs | RPM : 200-600 RPM |
| Brush | Min 1 Pcs | 3” |
| Grinding Tools | Min 1 Pcs | – |
| Grout Injection Pump (When cracks occur) | 1 Pcs | Pressure : 1-10 bar |
| Surface Packer (When cracks occur) | 30 Pcs | – |
| SikaDur 42 MP or other equivalent material | 1 Set | According to Technical Sheet |
| Tools and Material | Quantity | Spesification |
| Bucket | Min 3 Pcs | Min. Capacity 5 L |
| Finishing Material | 1 Set | SikaTop 121 |
| Sikadur 752 or other equivalent material | 1 Set | Technical Sheet |
| Sikagrout 214-11 or other equivalent material | 1 Zak | Technical Sheet |
| Sikabond NV or other equivalent material | 1 Can | – |
| Trowel | Min. 1 Pcs | baik dan rata |
| Sand Paper | Min 5 Sheet | – |
| Water Jerry Cans | Min. 5 L | – |
2. Grouting Quality Test Grouting
Before carrying out the repair process, testing of the grouting quality grouting of the prepared materials is necessary to be performed. The purpose of this test is as the requirements for accepting grouting material to repair cracks or chip defects in the PCI Girder due to stressing. stressing.The test will be carried out by making sampling cubes as test objects with dimensions of 5.00cm x 5.00 cm x 5.00 cm. (SNI 03-6825-2002).
Testing of the test object is carried out parallel at the age of 1 day, 3 days and 7 days (a total of 6 test objects is needed). The test begins by weighing the objects which have been previously soaked until the specified durations. After that, the test object is placed on the pressing machine, then the test object is pressed with an increasing amount of force until it breaks.
At the time of rupture, the maximum value of compressive strength applied is recorded. The compressive strength results must be in accordance with the planned compressive strength of the girder to be repaired.
3. Implementation Method
The next stage of repairing porous girders is the repair implementation process. Generally, the flow of this repair is as follows:
First of all, if the girder experiences over lateral or over chamber during stressing, then the implementation method, namely: over lateral or over chamber during stressing, then the implementation method, namely:
- Release process of strand.
- Surface area preparation of repair.
- Process of mixing the material repair.
- Injection material application process (when cracks occur).
- Application process of material grouting.
However, when the girder does not experience over lateral or over chamber during stressing, then the implementation method will be as follows:
- Surface area preparation of repair.
- Material mixing process of repair.
- Injection material application process (when cracks occur).
- Application process of material grouting.
