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.


hardener

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


hardness

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


holiday

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.


honeycomb

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.


hydration

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.


hydrodemolition

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.


hydrophilic

material which exhibits a strong affinity for water; wettable.


hydrophobic

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.


hydroxide

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


hydroxyl

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


hygrometer

an instrument used to measure humidity.


hygroscopic

material that readily absorbs and retains moisture from the air.



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