|Areas Repaired||Piano bridge|
|Repair Types||Expansion Joints|
|Issues||Area of expansion joint severely deteriorated, with parts of concrete missing|
The suspended concrete slab resting on the ledge beam has a significant expansion joint travel. Over the years, that area of expansion joint had deteriorated, with parts of concrete missing.
In order to repair this expansion joint, both floor slabs had to be patched and restored to their original geometry. Following structural repairs, expansion joint was filled with low-VOC expansion joint material.
Under traditional repair methods, patching requires a minimum of two-inch demolition in the affected area. The use of our unique products, Polyforce Plus Adhesive, and Polyforce Polymer Cement, permits thin-patch applications, making the job much more cost-efficient and faster.
Our patching process is as follows:
Delaminated and unsound concrete is removed.
- Polyforce Plus Adhesive is applied as an adhesive layer. Its impressive 1.85 MPa adhesive strength ensures monolithic adhesion.
- Within 40 minutes, the actual patch is applied. On very thin patches (less than a ¼ of an inch), Polyforce Polymer Cement is used; otherwise, regular cement.
Normally, when there is a failure of waterproofing membrane over the surface of expansion joints, the entire membrane must be removed and reinstalled. The excavation required by the traditional repair method is quite costly, but can be avoided with the use of PolyFlex expansion joint application.
What we do is drastically different: we drill injection ports and inject our specialized liquid material which turns into soft rubber. It has tremendous adhesion power capable of binding cracked concrete, and displacing any accumulated water, not allowing it to re-enter. The concrete slabs can still expand and contract due to the nature of the materials injected. At the same time, such injection seals any crack in the membrane, preventing any future leaks from recurring.
In accordance with third-party testing, the repaired surfaces are rated to the following:
- 25 years of useful life
- 0% water permeation
- Polyforce Plus is rated to expand and contract with concrete
- The entire surface and volume of the slab is "monolithic"
- Polyforce Plus compressive strength of 85 MPa
- Basalt mix compressive strength of 150 MPa
- Adhesive strength of 1.85 MPa (original concrete has only 1.2 MPa of a tensile strength, so the bond is stronger than the concrete itself)
- Repair is 60% cost of a traditional repair
- Application of PolyFlex from the negative side reduces cost by 90% when compared to the traditional method of repair
- 10 years of useful life
- 0% water permeation
- PolyFlex is able to expand and compress 200%
- 200% expansion and compression does not affect adhesion or tensile strength of PolyFlex