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Autogenous self-healing crack. Self-healing concrete is characterized as the capability of concrete to fix its cracks on its own autogenously or autonomously. It not only seals the cracks but also partially or entirely recovers the mechanical properties of the structural elements. This kind of concrete is also known as self-repairing concrete.
Slots are cut using diamond-tipped saw blades; the existing concrete is removed and the dowels are placed in the slots across the joints or cracks. The slots are then backfilled with a non-shrink grout and the pavement is diamond ground to restore smoothness. The diamond grinding removes excess grout and any displacement of panels.
Cracks and other types of damage on a microscopic level have been shown to change thermal, electrical, and acoustical properties of materials, and the propagation of cracks can lead to eventual failure of the material. In general, cracks are hard to detect at an early stage, and manual intervention is required for periodic inspections and repairs.
Some of the most important types of crack are as follows: [1] [4] Crocodile cracking, also known as alligator cracking and fatigue cracking; Block cracking (caused by shrinkage of asphalt) Longitudinal cracking—wheel path; Longitudinal cracking—non-wheel path; Transverse cracking; Reflection cracking at joints
Reflective crack. A reflective crack is a type of failure in asphalt pavement, one of the most popular road surface types. Asphalt pavement is impacted by traffic and thermal loading. Due to loading, cracks can appear on pavement surface that can reduce the Pavement Condition Index (PCI) dramatically. The pavement can be maintained by overlay.
In poured concrete foundations, cracks and pipe penetrations are the most common entry points for seepage. These openings can be sealed from the interior. Epoxies , which are strong adhesives, or urethanes can be pressure injected into the openings, thus penetrating the foundation through to the exterior and cutting off the path of the seepage.
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