ICRI Concrete Repair Terminology (H)
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Revised June 2015

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hairline crack

halo effect

half-cell potential

a nondestructive testing method for identifying regions in a reinforced concrete structure where there is a high probability that corrosion is occurring at the time of test by measuring the potential difference (voltage) between the steel reinforcement and a standard reference electrode; a copper-copper sulfate half-cell is commonly used on bridge decks.

Hamm tip

flared shotcrete nozzle having a larger diameter at midpoint than at either inlet or outlet; also designated premixing tip.

hand-held breakers

hand lance

hand-held wand or tool used to direct a water jet during water blasting; lance may have single water jet or multiple water jets mounted on a rotating head.


in a two-component adhesive or coating, the chemical component that causes the resin component to cure.


the resistance of a material to deformation, particularly permanent deformation, indentation, or scratching.

hazardous substance

any substance that can harm people, other living organisms, property, or the environment.

heat-deflection temperature

the temperature at which a plastic material has an arbitrary deflection when subjected to an arbitrary load and test condition; this is an indication of the glass- transition temperature.

heat of hydration

heat evolved during the setting and hardening of Portland cement.

heat of solution

heat emitted or absorbed by a substance being dissolved in a solvent.

high-build coating

high-molecular weight methacrylate

a low-viscosity substituted methacrylate monomer that is characterized by low volatility.

high-pressure water blasting

high-pressure waterjet

high-range water reducer


a discontinuity in a coating material that exposes the substrate.

hollow-core bit

carbide-tipped drills with internal ports for water flushing or vacuum extraction of cuttings during drilling; used in drilling deep injection ports to minimize plugging of internal cracks intersected by drill hole.

homogenous material

a material that exhibits essentially the same physical properties throughout the material.


voids in concrete created when the mortar does not fill all the spaces among coarse aggregate particles.

hybrid composite

a composite made with two or more types of reinforcing fibers.


combining water with another substance to create a compound; in concrete, the chemical reaction between hydraulic cement and water.

hydraulic splitting

a method for removal of concrete by means of hydraulic forces that split concrete into smaller masses.

hydro nozzle

a special prewetting and mixing nozzle consisting of a short length of delivery hose inserted between the nozzle body and nozzle tip.


a method for concrete removal and surface preparation using high-pressure or ultra-high pressure water; this method is capable of removing sound and deteriorated concrete and provides a sound concrete substrate; the process will also clean existing steel reinforcement for reuse; hydrodemolition is typically performed at pressures higher that 10,000 psi (70 MPa). (See also waterjet.)

hydrogen embrittlement

cracking or loss of ductility caused by hydrogen in a metal.


material which exhibits a strong affinity for water; wettable.


material which does not exhibit affinity for water; tends to repel water.

hydrostatic head

the fluid pressure of a liquid produced by the height of that liquid above a given point.


a chemical compound containing hydroxyl ion. (See also pH.)


the OH- anion which has a single negative charge, and provides the characteristics common to bases. (see also pH.)


an instrument used to measure humidity.


material that readily absorbs and retains moisture from the air.

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