WATERSTOPS
Swellstop 47B waterstop is a unique sealing compound which expands in a controlled fashion when exposed to moisture, forming a compression seal in concrete joints.
Swellstop 47B waterstop is ideal for use in horizontal and vertical construction joints for cast in-situ concrete and precast concrete structures.
Swellstop 47B waterstop is manufactured utilising a specialised mixing process which encapsulates hydrophilic materials into a rubber base creating a controlled, moisture-activated sea. This product has the structural integrity of a rubber-based sealant, the features of a butyl sealant, as well as the ability to expand to create a SELF-HEALING JOINT MATERIAL
WHAT DOES CONTROLLED EXPANSION MEAN?
Unlike many of the traditional clay-based products, Swellstop 47B waterstop, being hydrophilic polymer based, will not expand to a point that the hydration process itself leads to the possible "disintegration" of the waterstop.
This can be an important issue when engineers are looking for a seal in vertical construction joints where the joint could open up due to shrinkage in the concrete. In-field experience has proven that products which continually expand, may lose their structural integrity and begin to wash away from the joint when subjected to a constant flow of water. Swellstop 47B Water stop is a butyl hydrophilic which has a built-in delay system which activates after approximately 10 days of constant exposure to water.
Thus the material does not expand prematurely, does not absorb water from the fresh concrete poured against it, and helps prevent any pre-expansion if the joint becomes ponded with water.
This gives the contractor peace of mind knowing that the material will not expand prior to the second pour of concrete after the formwork shutters are in place.
Swellstop 47B waterstop has been tested to withstand a 40 metre head of pressure and because of its butyl properties actually bonds to both concrete surfaces.
AREAS OF APPLICATION
Typical applications for Swellstop 47B waterstop Include:
Tunnels, Underground Structures, Pits, Box Culverts, Retaining Walls, New to Old Concrete, Manholes, Poured in-situ Construction Joints, Basements, Above & Below Grade Precast Panels
SPECIFICATION
Waterstops where shown on the drawings shall be Swellstop 47B controlled expansion waterstop as supplied by Lesa Systems. The waterstop is to have a built-in delay system to avoid any pre-expansion and must not show any signs of deterioration or disintegration during and after expansion. The waterstop is to be placed in accordance with the manufacturers installation guidelines.
LIMITATIONS
Due to expansive forces, Swellstop 47B waterstop should be both detailed and installed with a minimum 25mm clear cover to the face of concrete.
Expansion rate can vary in salt and contaminated water. Increase cover when using light weight, low strength concrete.
ADVANTAGES
- Built-in delay system to stop premature expansion
- Excellent for applications to rough concrete surfaces
- No loss of integrity of waterstop.
Allows concrete to gain full strength before expansion
- For use in horizontal and vertical joints
- Excellent adhesion to Swellstop 47B primer/adhesive
- Can be bedded into wet concrete
- No compaction or displacement problems
- Unaffected by repeated wt and dry cycles
- Bonds to both concrete surfaces
- Does not turn to mush or lose integrity over time in water
- No on-site welding required as with PVC waterstops
- Very easy to handle and install
- No split forming required
- Non toxic and requires no special handling
MSDS
Material Safety Data Sheets are available as required for Swellstop 47B
Waterstop and primer/adhesive.
PACKAGING
| Dimensions |
25mm x 20mm x5m rolls
(6 rolls per carton) |
Primer/Adhesive
|
1 Litre cans
4 Litre cans
|
| Primer/Adhesive coverage (approx) |
30m per 1 litre can |
|
|
|
|
PHYSICAL PROPERTIES
| DESCRIPTION |
SPEC |
|
| Colour |
|
black |
| Size |
|
25mm x 20mm |
| Specific Gravity |
ASTM D-71 |
1.40/1.45 |
| Hydrocarbon Content |
ASTM D-297 |
47% min. |
| Volatile Matter |
ASTM D-6 |
1% max. |
| Penetration, cone @ 77 F, 150gm; 5sec |
|
|
| Head Pressure |
ASTM D-217 |
40 |
| Application Temperature |
|
Tested to 40m |
|
Service Temperature Range |
|
-22 -> 52C |
|
|
-34 -> 82C |