Home » Asphalt sealant|blown asphalt sealant|hard asphalt sealant
We are manufacturer and exporter of all types of bitumen sealant and grades of hard asphalt joint sealant which is made by oxidizing and blown asphalt.
What is hard asphalt joint sealant (blown asphalt sealant or oxidized asphalt sealant)
The asphalt is preferably modified with the elastomeric material by mixture within a common solvent and then removal of the solvent such as by evaporation. Solvation of the asphalt and the elastomer within a single readily obtainable solvent is another consideration in the selection of an elastomer. Alternatively, both the asphalt and the elastomer may be melted together, with the asphalt functioning as a solvent for the elastomer at the higher temperatures, and thereafter applied as a hot melt material. Preferably the elastomer and asphalt mixture is applied to the required sealant location as an easily applied liquid prior to solvent removal or hot melt solidification thereby forming the elastomer modified asphalt sealant in situ. Preferred solvents include highly aromatic solvents such as white spirits (kerosene), toluene and xylene because of their ready solvation of both asphalt and elastomeric materials and their high volatility whereby they can be readily driven off. The amount of solvent utilized in the formation of the elastomer-asphalt mixture should be sufficient to solvate elastomer and asphalt but not in too much excess whereby it is not readily removable. Alternatively, if possible with the specific materials being utilized and the manufacturing procedure being followed, a solvent carrier is not utilized with the elastomeric modified asphalt being applied, as required, in the form of a hot melt liquid.
Modified asphalt filler and sealant materials are commonly utilized to repair cracks, joints and other crevices in concrete and asphalt surfaces. To prevent roadway deterioration caused by water intrusion at concrete slab junctures for example, or through an asphalt surface crack, the filler material must completely seal the crack. In addition, the filler material should provide a seal that is not susceptible to deterioration caused either by traffic stress, or by the contraction and expansion of surrounding concrete during freeze thaw cycles.
Therefore the filler material must exhibit elasticity, flexibility, good adhesion to the walls of a joint, and overall resistance to cracking and failure.In order to obtain a sealant having these desired physical properties, it is known to add rubber or other elastomer modifiers to asphalt. In the past, these asphalt-rubber sealants have been applied while hot so that the sealant material is fluid. This permits easy pour application such that the void is completely filled and adhesion to the joint walls is enhanced. Many of the important properties that determine the overall effectiveness of an asphalt sealant material such as the ability of good adherence and bonding at high and low temperatures, good elasticity such that the seal lasts for a long time without deterioration, and a high solids content to prevent shrinkage and prolonged drying times have heretofore been lacking in the art. In summary, an emulsified cold pour sealant that is equal to or superior to known hot pour sealants in overall performance is lacking in the art
Specification of asphalt sealant
Construction method of sealing by joint hard asphalt joint sealant
.1 Clean pavement joints as directed by the Contract Administrator.
.2 Remove all existing sealants, dirt and foreign material to a minimum depth of 20 millimetres below the pavement surface to the satisfaction of the Contract Administrator.
.3 Remove dust and loose particles with an oil free air jet having sufficient volume and pressure, immediately before placement of the sealant material.
.1 Clean cracks larger than 2 millimetres and less than 25 millimetres in concrete and asphalt pavement surfaces as directed by the Contract Administrator.
.2 Route cracks between 2 millimetres and 10 millimetres to a minimum width of 10 millimetres and depth of 20 millimetres below the pavement surface.
Optionally for asphalt pavements or overlays route all cracks less than 25 millimetres to a width of 25 – 30 millimetres and a depth of 12 millimetres below the pavement surface.
.3 Clean cracks greater than 10 millimetres to 25 millimetres wide to a minimum depth of 20 millimetres to the satisfaction of the Contract Administrator.
.4 Remove dust and loose particles with an oil free air jet having sufficient volume and pressure, immediately before placement of the sealant material.
Joint and Crack Sealing
.1 Place joint sealant in joints and cracks for exposed concrete pavements even with the pavement surface.
.2 For asphalt pavements or overlays seal cracks as follows:
For cracks routed to a width of 10 millimetres, place joint sealant 2 millimetres to 4 millimetres above the pavement surface to provide a band-aid seal over the crack. Upon completion, the sealant will overlap either side of the crack by a minimum 40 millimetres.
For cracks routed to a width of 25 – 30 millimetres, place joint sealant so that upon cooling, the sealant will be recessed approximately 2 millimetres below the pavement surface.
.3 Fill from the bottom up utilizing an approved mechanical pressure joint filling system equipped with continuous agitation.
.4 Apply joint sealant in two operations for wide or deep openings to minimize shrinkage.
.5 Avoid overfilling and spilling of sealant on the pavement surface.
.6 Complete sealing when surface is dry. Place sealant at ambient temperature of at least 4°C and rising.
.7 No traffic or construction equipment will be allowed to travel over the sealed joints or cracks until such time as the sealant has cooled to atmospheric temperature. Apply cement dusting to sealed joints and cracks where early opening to traffic is required.
.8 Reheating of unused joint sealants will not be permitted.
.9 Remove off site all debris from the routing and cleaning operations to the satisfaction of the
Longitudinal Joint and Crack Filling (greater than 25 mm width)
.1 Remove all dirt and foreign material to a depth of 60 millimetres below the pavement surface to the satisfaction of the Contract Administrator.
.2 Remove dust and loose particles with an oil free air jet having sufficient volume and pressure, immediately before placement of filler material.
.3 Place and compact longitudinal joint and crack filler to match the pavement surface to the satisfaction of the Contract Administrator.
.4 Remove off site all debris from the filling and cleaning operations to the satisfaction of the