Bleed water: The autogenous flow of mixing water emerging from newly placed concrete or mortar.
Bonding Agent: A substance applied to the substrate to create a bond between it and the succeeding layer.
Bond Breaker: Material used to facilitate independent movement between two units, which would otherwise behave monolithically.
Bond Strength: Resistance to the separation of two materials, which are in contact.
Compressive Strength: The measured maximum resistance of a concrete or mortar specimen to axial loading.
Corrosion: Degradation of concrete or steel reinforcement by electrochemical or chemical attack.
Corrosion Inhibitor: A chemical compound which, when added in small concentrations to concrete or mortar, effectively checks, decreases, or prevents reaction of embedded metal with the environment.
Curing: The maintenance of humidity and temperature of freshly placed concrete during some definite period following placing, casting or finishing assuring satisfactory hydration of the cementitious materials and proper hardening of the concrete.
Curling: The distortion of a member that was originally, essentially linear, into a curved shape due to differences in temperature or moisture content in the zones adjacent to its opposing faces.
Delamination: A separation along the plane parallel to a surface, as in the separation of a coating from a substrate or the layers of a coating from each other; or in the case of a concrete slab, a horizontal splitting, cracking or separation in a plane roughly parallel to, and generally near, the upper surface.
Drying Shrinkage: Contraction due to moisture loss after cementitious material has been hardened.
Feather Edge: The edge of a concrete or mortar placement, such as patching or topping, which is beveled at an acute angle.
Hairline Cracking: Small cracks of random pattern in an exposed concrete surface.
Hardener: A substance that enters into chemical combination with other substances to form a new, more solid material.
Hydration: The process by which cement reacts with water whereas the paste hardens and gains strength to form a rock-like mass known as concrete.
Latex: An emulsion of natural or synthetic rubber in water phase.
Modulus of Elasticity: The ratio of normal stress to corresponding strain for tensile or compressive stresses below the proportional limit of the material.
Plastic Cracking: Cracking that occurs in the surface of fresh concrete soon after it is placed and while it is still plastic.
Plastic Shrinkage: Shrinkage that takes place before cement paste, mortar, grout, or concrete sets.
Polymer: A compound formed by the reaction of simple molecules having functional groups, which permit their combination to proceed to high molecular weights under suitable conditions.
Rebound: Aggregate and cement or wet shotcrete that bounces away from a surface against which it is being projected.
Reflection Cracking: The occurrence of cracks in overlays and toppings that coincide with the location of cracks in the base slab.
Scaling: Local cracking or peeling away of the surface concrete or mortar.
Shrinkage: A volume decrease caused by drying chemical changes.
Silane: A solution of a low molecular weight composition of silicone and hydrogen used as a penetrating sealer for concrete and masonry surfaces.
Siloxane: A silicone and oxygen-based compound also containing carbon and hydrogen used as a penetrating sealer for concrete and masonry surfaces.
Slump: Measure of consistency of freshly mixed concrete.
Scrub Coat: A brushed application of neat material to prep the SSD patch area forming a stiff slurry to aid in the bonding process.
Viscosity: The internal friction resistance of an adhesive to flow when that resistance is directly proportional to the applied force.
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