How are waterstops used? (Adhesive waterstops)

Functions of waterstops:

1. Waterstops utilize the high elasticity and compressive deformation properties of rubber to produce elastic deformation under various loads, effectively securing and sealing to prevent water leakage and seepage in building structures, and providing shock absorption and buffering.

2. In the design of large-scale engineering projects, due to reasons such as discontinuous pouring, foundation deformation, or thermal expansion and contraction of concrete components caused by temperature changes, construction joints, settlement joints, and expansion joints are necessary.

Waterstops must be installed at these joints to prevent water leakage.

3. Waterstops are mainly used in foundation engineering during cast-in-place concrete pouring, placed within construction joints and expansion joints to become an integral part of the concrete structure, such as underground facilities, tunnels, aqueducts, dams, and liquid storage structures.

How are waterstops used? Waterstops are partially or completely embedded in the concrete during the pouring process.

Before pouring concrete, ensure the waterstop is flat at the interface and the joints are firmly bonded. Then, pour and vibrate the concrete with appropriate force to position the waterstop and ensure good bonding with the concrete to avoid affecting its waterproofing effect.

What kind of glue can bond wet objects? And it needs to be easy to apply (what kind of glue is best for bonding waterstops?)

The chemical components of glue, in an aqueous environment, are composed of polymers (the vinyl acetate in white glue is a petroleum derivative) that are generally spherical particles with a radius between 0.5 and 5 μm. The bonding of objects relies on the tension between these polymers. In the glue, water acts as a carrier for the polymers, slowly penetrating the material. Once the water in the glue evaporates, the polymers, through mutual tension, tightly bind the two objects together. When using adhesive, applying too much glue causes the polymer molecules to clump together, preventing them from generating sufficient tensile strength. This crowding prevents the formation of strong mutual attraction. Simultaneously, moisture between the polymer molecules doesn't evaporate easily. This is why, in the bonding process, "the thicker the adhesive film, the weaker the felting effect." Excessive glue acts primarily as a "filler" rather than a bonder; the adhesion between objects relies on the glue's "cohesive force," not its adhesive strength.

If the adhesive is not water-soluble, the principle is largely the same, just using other solvents instead of water.

What can I do if glue keeps falling off? (What kind of glue should I use to attach the waterstop?)

The original poster didn't specify what kind of glue to use. Actually, 502 glue, AB glue, and other similar adhesives are all good and readily available. It's just that you're using them incorrectly. Let me explain how to use them on ceramics, metals, wood, etc.: 1. First, clean the surface of the object to be glued. 2. The key is to roughen the surface. You can use sandpaper or a grinder to roughen the surface. If the object is thick, you can drill holes in both surfaces and insert nails into the holes to glue them on together. Screws will work even better, as they serve to fix the object and connect the two ends. For things like hair clips and pendants, 502 glue is sufficient. However, if the first application doesn't secure the item, it will be difficult to stick it a second time because the surface is no longer clean. (You can buy banana oil at a paint store to clean it before trying to stick it again, although it only costs a little over three yuan a bottle, it's not very convenient.) I'll still describe the first method: Clean the surface of the hair clip or pendant to ensure it's dry. After applying the glue, the key is to press firmly for several minutes; the firmer you press, the stronger the bond will be.