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Revised June 2015
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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.
flared shotcrete nozzle having a larger diameter at midpoint than at either inlet or outlet; also designated premixing tip.
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.
any substance that can harm people, other living organisms, property, or the environment.
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 evolved during the setting and hardening of Portland cement.
heat emitted or absorbed by a substance being dissolved in a solvent.
high-molecular weight methacrylate
a low-viscosity substituted methacrylate monomer that is characterized by low volatility.
high-pressure water blasting
a discontinuity in a coating material that exposes the substrate.
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.
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.
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.
a method for removal of concrete by means of hydraulic forces that split concrete into smaller masses.
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.)
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.
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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