What does JSP water-swellable rubber sealing strip mean? (Water-swellable rubber sealing strip)

Water-swellable rubber sealing strip is a rubber sealing strip product made from imported special rubber as the main raw material, combined with inorganic water-absorbing materials, high-viscosity resin, and more than ten other special materials through intensive mixing, compounding, and extrusion.

When exposed to water, the water-swellable sealing strip gradually expands, eventually slowly blocking the ubiquitous capillary pores, making the contact with the concrete interface more compact, thus generating greater water resistance and forming a waterproof, plastic colloid. This product features a high expansion ratio and strong mobility and replenishment properties. After being placed in construction joints or grouting joints, it has a strong self-healing function, automatically sealing new micro-cracks caused by settlement. For completed projects, if there is leakage in the joints, the sealing strip can be used to re-seal the leaks. The construction cost is low, the construction process is simple, and it has excellent corrosion resistance.

What are the functions and performance of water-swellable rubber sealing strips? (Water-swellable rubber waterstop strip)

Product Introduction:

Water-swellable rubber waterstop strips are a general term for water-swellable putty strips and water-swellable rubber strips, both possessing water-swellable properties. Water-swellable rubber is a unique new rubber product. It possesses the properties of general rubber products and the ability to expand upon contact with water, making it a new type of waterproof material with more reliable water-stopping and waterproofing effects than ordinary rubber.

Performance:

Water-swellable rubber has superior characteristics and advantages compared to ordinary rubber. This type of rubber expands 2-3 times its original size upon contact with water, filling all irregular surfaces, cavities, and gaps in the joint, while simultaneously generating significant contact pressure to completely prevent leakage. When joints or construction joints shift, causing gaps to exceed the material's elastic range, ordinary rubber waterstop materials lose their water-stopping function. However, this material can still stop water by absorbing water and expanding. Using water-swellable rubber as a leak-sealing and waterproofing material not only saves on material usage but also eliminates the elastic fatigue caused by excessive compression of general elastic materials, making the waterproofing effect more reliable.

Working Principle:

The water-swellable sealing strip is made from over ten materials, including imported special rubber, inorganic water-absorbing materials, and high-viscosity resin, through intensive mixing, blending, and extrusion. Developed based on foreign products, it is a square-section, self-adhesive, water-swellable strip. It is directly adhered to the interface of concrete construction joints and post-cast joints after the second pour of concrete (i.e., when encased in concrete). Upon contact with water, the product gradually expands, blocking any potential capillary pores and creating a tighter seal at the concrete interface, generating significant water resistance and forming a waterproof, plastic colloid. This product features a high expansion ratio, strong mobility and replenishment, and strong self-healing properties after placement in construction and post-cast joints. It can automatically seal new micro-cracks caused by settlement. For completed projects, if leaks occur, the sealing strip can be used for resealing. This sealing strip is inexpensive, easy to install, and offers excellent corrosion resistance.

Its function is waterproofing, typically used at construction joints. Construction joints have relatively weak waterproofing, allowing water to easily seep in. When water enters and encounters the waterstop strip, the waterstop strip expands, filling the gap and thus stopping the water in. This type of strip cannot be used as a substitute.

How to construct a water-swellable rubber expansion joint? (How long does it take for the water-swellable rubber waterstop to noticeably expand after contact with water?)

Water-swellable rubber expansion joints can be used in new construction projects, using water-swellable rubber as the main waterproofing material, supplemented by a fixing layer and a protective layer. They can also be used for repairing leaking expansion joints in existing buildings. The main construction steps are:

1) Clean the old joint to expose the original joint walls and lower the groundwater level.

2) Insert 2cm thick wooden boards, the same width as the joint and treated with anti-corrosion, into the joint, creating grouting holes every 50-60cm, and then embed them into the joint at appropriate locations for fixation.

3) Grout through the injection holes, injecting water-soluble polyurethane grout (or other effective grouting materials) to stop the leak. Then seal the wooden board surface with modified asphalt sealant, with a thickness of not less than 2cm.

4) Further clean and repair the joint. Bend the thickened neoprene rubber waterstop into a U-shape, and add 5cm wide water-swellable rubber strips on both sides where they contact the joint walls, embedding them into the expansion joint.

5) To ensure tight contact between the waterstop and the water-swellable rubber and the side walls of the joint, wedge a corrosion-resistant hardwood board into the middle of the U-shape of the waterstop.

6) After the waterstop is properly installed, pour a 4cm layer of fine aggregate waterproof concrete on top to fix the waterstop in place.

7) After the concrete has hardened and dried, roughen the inside and outside of the joint and remove impurities and dust. Then, apply a layer of "Lekna" (triphenylmethane triisocyanate) adhesive, followed by the injection of two-component PG308 adhesive (polyurethane adhesive), 5mm higher than the floor level, and smooth and seal both sides.