This popup will close automatically once your project list has loaded. This older technology relies on adhesive that is in severe tension during the joint opening cycle. It is prone to adhesive failure. The DSM material expands slower when cold and faster when hot. On this cool, early autumn day, the material was stored in the sun to warm it up to make it expand a bit faster.
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This ensures watertightness is achieved at the deck surface. Non-Invasive Anchoring—there are no hard metal-to-concrete connections in the system. This includes embedded pins, anchors, screws, bolts or tracks, trays or rails. The system is locked to the joint faces by means of the 1 backpressure of the foam, 2 the epoxy adhesive, and 3 the injected silicone sealant band at the joint face to foam and silicone bellows interface.
Continuity of Seal—as in all EMSEAL expansion joint systems, continuity of seal through changes in plane and direction is an essential performance differentiator.
Installed between the tank wall and the digester lid, DSM-DS keeps the weather out while keeping the methane and other gases in. Tunnel Walls and Ceilings To Redirect Positive-Side Water Flow from the Negative Side: Existing tunnel structures often leak at expansion joints due to water draining through the surrounding ground and accumulating on the tunnel lining.
Few options exist for addressing structural expansion joints in this situation. For more, see Wheeling Tunnel product case study. The joint in the inside of the planter must be sealed to prevent irrigation water from leaking out of the planter into the structures below or adjacent.
The outside of the joint in the planter walls must be sealed to fill the joint aesthetically and to keep the weather out. DSM-DS, because it can be customized in depth to suit the thickness of the planter wall, and because the outer silicone bellows can be supplied in any of 26 colors, can be made to coordinate aesthetically with the finish of the outer face of the planter walls. The surest way to remediate this type of leakage is to excavate to expose the foundation to address the waterproofing from the positive side.
As this is seldom practical, a solution from the negative side is often sought. This condition is very difficult to address especially where any sort of head pressure is likely to build up. DSM-DS alone has been successfully used in many cases to stem the flow of water into foundations where a perimeter drainage system on the outer side of the foundation wall and floor is functioning.
The perimeter drainage or some other active drainage system ex. Composition Produced by infusing a cellular foam base material with a hydrophobic, microsphere-modified acrylic impregnation, and coating the surface with a high-performance silicone to suit the application. The external silicone facing is factory applied to the foam at a width greater than maximum joint extension and is cured before final compression. Silicone application and curing takes place in a temperature and humidity-controlled factory environment.
This ensures, in contrast to field applied liquid sealant and backer rod installations, that no movement takes place during curing that can cause deformation or stresses in the sealant material. The material is precompressed to less than the joint size for easy insertion. When compressed, a bellows is created in the coating. As joint movement occurs the bellows simply folds and unfolds free of tension on the bond line, and virtually free of tensile stresses in the silicone material.
The material is supplied in 6. After removal from the shrink-wrap and hard board restraining packaging, it expands gradually.
The foam provides a resilient backing to the silicone coating, making the system capable of resisting reasonable transient point loads. Fuel Resistance: Silicone sealant is not degraded by contact with fuel. Some swelling of the material will normally occur, but it will return to its original shape upon evaporation of the fuel. Watertightness through the plane change is guaranteed—leaving nothing to chance in field-fabricating inside and outside transitions. U transitions are symmetrically coated on both faces allowing them to be installed as an inside corner or as an outside corner.
Maintenance As with any construction product, the useful life of the material can be maximized with routine inspection and repair if required. Clearing of surface debris and inspection will reveal any damage to the product or adjacent substrates that might affect building performance.
EMSEAL precompressed sealants are easily repaired—requiring only damaged sections to be removed and reinstalled—not the entire length of the joint as is typical of extruded-seal systems. An abandoned coal mine above the tunnel leaches water down toward the tunnel.