Concrete Repair Terminology is prepared by the International Concrete Repair Institute. The cross-referenced terms provide definitions for commonly used words in concrete repair, restoration and protection.
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Revised April 2019
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an integral covering which is applied over an existing structural element, e.g. a concrete pile, whose primary function is to strengthen or provide environmental protection, or both.
hand-held mechanical breaker for removal of concrete.
boom-mounted mechanical crusher for removal of concrete from decks, walls, columns, and other concrete members where the shearing plane depth is 6 ft (1.8 m) or less; pulverizing jaw attachment can debond concrete from steel reinforcement for recycling purposes. (See also mechanical shearing.)
a physical separation in concrete, including cracks if intentionally made to occur at specified locations.
a joint with movement limited by restraint.
an unplanned joint or discontinuity resulting from a delay in placement of sufficient time to preclude a union of the material in two successive lifts.
interface between two successive placements; bond is typically required at such joints and reinforcement may be continuous.
formed, sawed, or tooled groove in a repair surface to create a weakened plane and regulate the location of cracking resulting from restrained dimensional change.
1) a separation provided between adjoining parts of a structure to allow expansion and contraction; 2) a separation between pavement slabs on grade, filled with a compressible filler material.
a separation between adjoining parts of a structure that allows relative movement in three directions; usually vertical planes located to avoid formation of cracks in the structure. (See also joint, contraction and joint, expansion.)
a joint parallel to the length of a structure or pavement.
a joint cut in hardened concrete, generally not to the full depth of the member, by means of special equipment.
a joint normal to the longitudinal dimension of a structural element, assembly of elements, slab, or structure.
compressible material used to fill a joint to prevent the infiltration of debris and to provide support for sealants.
a fragment detached from a concrete mass adjacent to a joint.
a specially built mobile carrier used to provide a work platform for tunneling operations, such as installing rock bolts and grouting.
person or entity that has legal control over the applicable building code and permitting procedures for a structure; examples of jurisdictional authorities include local building officials.
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a saw cut in a concrete surface for embedment of the perimeter of a membrane or other thin surface treatment.
—a recess or groove in a concrete substrate which is filled with repair material to provide increased shear strength along the interface.
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a weak layer of cement and aggregate fines on a concrete surface that is usually caused by an overwet mixture, overworking the mixture or excessive finishing, underwater concrete placement, or combinations thereof.
to bond layers of a material.
equipment for shooting refractory shotcrete material into areas that have a high temperature; typically, a length of metal pipe with an extended nozzle with various configurations.
a stable emulsion of natural or synthetic rubber in water.
the quantity of material that accidentally enters or escapes through an opening such as a hole or crack.
licensed design professional
1) An engineer or architect who is licensed to practice structural design as defined by the statutory requirements of the professional licensing laws of a state (province) or jurisdiction; 2) The architect or engineer, licensed as described, who is responsible for the structural design of a particular project (also historically engineer of record).
individual layer of repair material where several layers or courses are required to achieve the total depth of a repair.
a procedure that uses a calibrated hydraulic ram system to assess the effective force in an unbonded post-tensioned tendon or to detension existing tendons.
softening and raising or wrinkling of a pervious coat by the application of an additional coat; often caused by coatings containing strong solvents.
a nondestructive testing method to estimate the instantaneous corrosion rate of the concrete reinforcement located below the test point by measuring the current required to change by a fixed amount the potential difference between the reinforcement and a standard reference electrode.
any protective material applied to the interior surface of a conduit, pipe, or tunnel to provide watertightness, erosion resistance, chemical resistance, or reduced friction.
measurement of grout on the basis of the total volume of solid and liquid constituents.
a moving load on a structure.
device for measuring the magnitude of an applied load.
a factor by which a service load is multiplied to determine a factored load used in the strength-design method.
procedure consisting of applying loads to verify the strength and behavior of a structure or structural member.
device that maintains tension on a monostrand tendon while the end anchorage is replaced.
a definite quantity of a product or material accumulated under conditions that are considered uniform for sampling purposes.
low-pressure spray-applied mortar
the placement of a repair material by spraying using a low- velocity pump with air added at the nozzle.
low-pressure water blasting
in grouting, the physico-chemical characteristic of a grout material flow through a soil or rock that is the inverse of the inherent friction of that material to the soil or rock; comparable to “wetness.”
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