ignition loss — see loss on ignition (preferred term).
ilmenite — a mineral, iron titanate (FeTiO3), which in pure or impure form is commonly used as aggregate in high-density concrete. —
impact hammer — see hammer, rebound (preferred term).
impending slough — consistency of a shotcrete mixture containing the maximum amount of water such that the product will not flow or sag after placement. History
inclined-axis mixer — see mixer, inclined-axis.
incrustation — a crust or coating, generally hard, formed on the surface of concrete or masonry construction or on aggregate particles.
indented strand — see strand, indented.
indented wire — see wire, indented.
index, plasticity (PI) — the range of water content in which a soil remains plastic, evaluated as the numerical difference between liquid limit and plastic limit, as calculated according to ASTM D 4318. (Also referred to as plasticity.) History
index, pozzolanic-activity — an index that measures pozzolanic activity based on the strength of cementitious mixtures containing hydraulic cement with and without the pozzolan; or containing the pozzolan with lime.
index, slag activity — the ratio of the compressive strength of a mortar cube made with equal amounts of slag and portland cement to the compressive strength of a mortar cube made with the same portland cement. History
inelastic behavior — see deformation, inelastic (preferred term).
inelastic deformation — see deformation, inelastic.
infrared spectroscopy — see spectroscopy, infrared.
initial curing — see curing, initial.
initial drying shrinkage — see shrinkage, initial drying.
initial prestress — see prestress, initial.
initial set — see set, initial.
initial setting time — see time, initial setting.
initial stresses — see stresses, initial.
initial-tangent modulus — see modulus of elasticity.
insert — anything other than reinforcing steel that is rigidly positioned within a concrete form for permanent embedment in the hardened concrete.
in-situ concrete — see concrete, cast-in-place (preferred term).
insoluble residue — the portion of a cement or aggregate that is not soluble in dilute hydrochloric acid of stated concentration.
insulating concrete — see concrete, insulating.
insulating concrete form (ICF) — a concrete forming system using stay-in-place forms of rigid foam plastic insulation, a hybrid of cement and foam insulation, a hybrid of cement and wood chips, or other insulating material for constructing cast-in-place concrete walls. History
insulation, form — insulating material applied to outside of forms between studs and over the top in sufficient thickness and air tightness to conserve heat of hydration to maintain concrete at required temperatures in cold weather.
insulation, roof — low-density concrete used for insulating purposes only and placed over a structural roof system.
intermittent sampling — see sampling, intermittent.
internal curing — see curing, internal.
internal vibration — see vibration.
inverted L-beam — a beam having a cross section in the shape of an inverted L. (See also L-beam.)
inverted T-beam — a beam having a cross section in the shape of an inverted T. (See also T-beam.)
I-section — beam cross section consisting of top and bottom flanges connected by a vertical web.
isolation joint — see joint, isolation.
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