5837-19 - Shoulder edge area marked out for removal Sawing...

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Full-Depth Repair of Jointed Concrete Pavement Full-depth patching is used to repair concrete slabs which have distresses which extend through the entire depth of the slab. These distresses include: 1. Blowup 2. Corner break 3. Durability “D” cracking 4. Joint load transfer-associated deterioration 5. Patch adjacent deterioration 6. Patch deterioration 7. Spalling of joint or spalling of crack
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Slab cracking & spalling requiring full-depth repair Patch deterioration requiring full-depth repair
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Deterioration beneath slab
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Patch boundaries should be selected so that all of the surface and underlying deterioration is removed. The performance of the patch is dependent on the joint design. Types of sawed joints: 1. Rough faced 2. Smooth faced Load transfer method across the joints 1. Tie bars 2. Dowel bars 3. Under cut joint 4. Aggregate interlock (with rough faced joints)
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Example of spalling of patch with improper joints
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Recommended joints Recommended joints
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Recommended joints Recommended joints
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Unformatted text preview: Shoulder edge area marked out for removal Sawing of patch boundaries Use of a concrete breaker for slab breaking Concrete removal using bucket of backhoe Subbase may be damaged by the use of bucket Removal of slab by lift-out method Lift out method for removal of concrete Large area removal Repair of disturbed subbase in patch area. Area must be thoroughly compacted to prevent settlement. Drilling of holes for dowel or rebar placement Full-depth saw-cut joint with drilled holes Grouting rebars Completed rebar installation Smooth dowel bars in place in wheel paths Placement of concrete patch. Insulating layer for curing of concrete Plot of concrete strength versus time & temperature Proper curing is needed before the concrete slab can be open for traffic Finished slab patch with tooled edge and curing compound Precast slab patching placement of cement grout before placement of precast slab Placement of precast slab for patching...
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5837-19 - Shoulder edge area marked out for removal Sawing...

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