Crack Sealing

 

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The single most-damaging pavement defect is cracks, because cracks allow water to penetrate the base beneath the surface. When water gets beneath the surface, it eventually causes greater and more widespread cracking, potholes, and eventually general pavement failure. Constant exposure to sun and rain is pavement’s greatest enemy. Oxidation from the sun causes shrinkage and separation of the asphalt surface. Once that happens, rainwater will penetrate the pavement subsurface and soften it. Without prompt attention, areas around the pavement will also begin to fail. As a result of increased oxidation, the main crack will only get larger. The result: cracks, potholes, and costly repairs.

Crack sealing from IPR, Ltd will prevent the deterioration of the sub-base pavement from infiltration of water and debris. The thorough cleaning of affected areas and the application of crack sealant will prevent further erosion of the surface and damage to the structural support of the pavement. Crack sealing material is designed to expand and shrink allowing for year-round performance. By sealing cracks early you can extend the life of your pavement considerably and prevent more costly repairs.

IPR, Ltd’s ensures that cracks are noticed early and treated before they spread causing costly repairs.

 

Reflective

This type of crack appears primarily in resurfacing projects, although it can also occur in a new pavement. It happens when an existing crack or joint in the underlying pavement structure reflects upward through the surface.

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Block

Visually, this type of cracking forms a square pattern, with cracks intersecting each other at nearly right angles. A common cause of this on parking lots is lack of traffic, (steady traffic constantly kneads the pavement and keeps it flexible). Other causes include excessive air voids, low-penetration asphalt, or an overly high plant mix temperature.

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Edge

Unlike the previous types, edge cracks appear only parallel to and within 18 inches of the edge of the pavement. Causes include poor base, lack of shoulder support, poor drainage, or frost action.

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Joint

Pavement “joints” are created during initial construction when the edges of two pavement mats are placed next to one another. These constructed joints usually have a lower density of asphalt than that of the surrounding pavement. If the mats don’t bond properly (for a variety of reasons), joint cracks appear.

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Slippage

Slippage cracks are usually crescent-shaped and caused by heavy traffic that is stopping, turning, or climbing a hill. Resultant stresses cause a bond failure between the upper and lower pavement layers. The open end of the U-shaped crack always points in the direction of the applied force.

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Fatigue or Alligator

Over time, a flexible asphalt pavement becomes more rigid and is less able to tolerate vertical deflections. This causes tension in the pavement and results in alligator-type cracking. Such cracking can also occur from structural inadequacy, aging, and oxidation.

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It is generally recommended that alligator areas be removed and replaced rather than filled or sealed.

In some cases, crack widening or routing is necessary. Routing is strongly suggested in truck areas, but not in cracks that have already been sealed. Configuration choice depends on factors such as crack type, pavement downtime, and budget. Crack routing creates a proper reservoir to which the crack sealant material adheres.

Preparation & Application

Singular cracks that are 1⁄4 inch and wider and not in alligatored areas will be thoroughly cleaned of all foreign matter with an industrial air compressor. The crack will be properly sealed using a state-of-the-art, oil-jacketed cracksealing system with a rubberized hot pour material.In the oil-jacketed system the material is hydraulically agitated, then pressure fed through an oil-jacketed pump and injected under pressure directly into the crack at the optimum temperature to prevent decomposition of the material and to maximize adhesion.

Routing

Where recommended, cracks will be mechanically routed prior to material installation to create a 1⁄2 inch deep by 1⁄2 inch wide reservoir.
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