Bitumen joint sealant

Solvent-free hot melt compositions for use as joint sealant , adhesives, caulking compounds or the like are produced by intimately blending elastomeric polymers with tackifying resins and plasticizers to obtain products having a hardness at room temperature of at least about 5 on the Shore A Durometer scale while being sufficiently soft at temperatures of about 50°F or higher to permit them to be easily extruded or otherwise applied. Adhesion promoters, lubricants, fillers and the like are preferably added to the composition to improve the properties thereof. The products are characterized by their stability over a wide range of temperatures, their resistance to oxidation and weathering, and their low moisture vapor transmission properties.Hot melt bitumen joint application is:

Construction Joints

Construction joint sealant and connectors for connecting between two and six orthogonal structural members are widely known and used in the prior art. Prior art connectors and joint constructions have often included specially formed connectors occupying large transport space, and relatively complex field operations in either assembling the joints or modifying the structural members in the field prior to forming the joints. These operations can be time consuming and require a degree of expertise and workmanship at a construction site

Expansion Joints

An expansion joint sealant is disclosed for a cable tray apparatus for a people mover system. An expansion joint is inserted or positioned between a pair of generally rectangular electrical cable trays having first and second ends. The cable trays are connected in an end-to-end relationship. The expansion joint has first and second ends and is positioned between the pair of cable trays so that the first end thereof is connected to the second end of the adjacent cable tray and so that the second end thereof is connected to the first end of the adjacent cable tray. The expansion joint includes body portions which are slid ably movable towards one another or slid ably movable away from one another to compensate for expansion and contraction of the cable tray apparatus.

Contraction Joints

A contraction joint sealant for use in forming a layer of concrete is disclosed which comprises a base, a central projection extending from the base having an upper apex section of uniform thickness and a lower triangular section having a cut-out portion to assist in the contraction and expansion of the joint, a plurality of water stops attached to the base, at least one on each side of the central projection, and a plurality of elongated ribs located between the water stops and the central projection. The joint is designed to be positioned so that the tip of the central projection is disposed at or slightly above the level of the surface of the layer of concrete formed above the joint. The use of the joint prevents a bond from forming in two adjoining concrete panels so that deterioration at the panel interface is reduced, stress in the concrete is relieved, and buckling is prevented. The joint is made of a flexible, durable material, and is particularly suitable for use in the preparation of concrete-lined structures for water conveyance systems such as canals or reservoirs.

Isolation Joints

A re-usable form for making diamond isolation joints used in the construction of buildings is disclosed. The form is made from wood, plastic cardboard, plastic sheet, wax coated cardboard or other material that can easily be separated from concrete. The form is placed onto a footing for a column or block out and the floor is poured around the form. After the floor is cured the form is collapsed inside itself to create the void of the diamond isolation joint sealant. The form can be re-used in another isolation joint sealant in the same building or on future construction projects. The form can be fabricated on site in various heights and dimensions. The form is folded or collapsed to make it easier to transport and store.
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