ISO 21809-5:2017 石油および天然ガス産業—パイプライン輸送システムで使用される埋設または水中パイプライン用の外部コーティング—パート5：外部コンクリートコーティング | ページ 6

3.1

aggregate

fine and coarse granular material such as sand, crushed stone, iron blast furnace slag, magnetite, ilmenite, or hematite used with a cement medium to form concrete or mortar

3.2

anode

sacrificial metallic attachment that is electrically connected to the steel pipe

3.3

applicator

company that undertakes the coating application in compliance with the provisions of this document

3.4

cementitious material

inorganic material or a mixture of inorganic materials that sets and develops strength by chemical reaction with water by formation of hydrates and is capable of doing so under water

3.5

compression wrap process

process by which the concrete mix is discharged into a coating head and applied in a continuous helical strip with pressure onto a rotating pipe

3.6

compressive strength

maximum compressive stress at the point of failure

3.7

concrete admixture

material, other than aggregate (3.1) , water, cement or supplementary cementitious material (3.33) , or fibre reinforcement, that is added as an ingredient to the concrete mix or one of its components, to enhance or modify the properties of the concrete or application process

3.8

concrete coated pipe weight

weight of the concrete coated pipe in air after the concrete cutback (3.13) has been completed

3.9

core

cylindrical specimen of a specific or designated diameter drilled from hardened concrete coating to be tested in compression or examined petrographically

3.10

cover

distance between the surface of the reinforcement and the outer surface of the concrete

3.11

cube

specimen of specific dimensions prepared from fresh concrete to be tested in compression

3.12

curing

action taken to maintain moisture and temperature conditions in a freshly placed cementitious mixture to allow hydraulic cement hydration and (if applicable) pozzolanic reactions to occur so that the required properties of the mix can develop

3.13

cutback

length of pipe left without concrete coating at each end

3.14

cylinder

cylindrical specimen prepared from fresh concrete to be tested in compression

3.15

electrical isolation

absence of electrical continuity between the steel pipe and reinforcement

3.16

field specimen

cores (3.9) , cubes (3.11) , cylinders (3.14) , prisms or in situ specimens taken from the hardened concrete coating

3.17

form process

pump process

process by which the concrete mix is poured into a mould on a stationary pipe

3.18

gap

annular separation between the concrete coating and the underlying substrate

3.19

holiday

pre-coating (3.25) discontinuity that exhibits electrical conductivity when exposed to a specific voltage

3.20

impact resistance

resistance of concrete coating against interference and accidental loads

3.21

impingement process

process by which the concrete is discharged at high velocity onto a rotating pipe

3.22

mix design

unique blend of aggregates (3.1) , cement, water, and supplementary cementitious materials (3.33) and/or admixtures that will result in a concrete mix

3.23

negative buoyancy

weight of the concrete coated pipe less the positive buoyancy of the concrete coated pipe when considered as a closed cylinder (3.14) immersed in the service environment

3.24

pi tape

tape used to measure the diameter of the concrete coated pipe

3.25

pre-coating

any coating or coating system applied to the external surface of the steel pipe prior to the application of the concrete coating

3.26

purchaser

company responsible for providing the product order requirements

3.27

reclaimed concrete

concrete that is reintroduced into the mix and does not require processing before reuse

3.28

recycled concrete as aggregate

concrete that has been reprocessed for use as aggregate (3.1)

3.29

shear resistance

resistance against relative displacement (movement) along the interface between the concrete coating and the underlying pre-coating (3.25)

3.30

slip form process

process whereby the concrete is applied to a vertical pipe by means of a slip form mould

3.31

specific gravity

ratio of mass of a volume of material to the mass of an equal volume of distilled water at a stated temperature

3.32

steel reinforcement

bars, wires, fibres, or strands, which are embedded in the concrete coating in such a manner that the reinforcement and the concrete act together in resisting forces

3.33

supplementary cementitious material

SCM

natural or man-made siliceous or siliceous and aluminous materials that can be used to either partially substitute Portland cement or increase the total content of cementitious material (3.4) in concrete mixes to improve the strength and durability of concrete

3.34

supplier

provider or manufacturer of supplies or materials used in the application of concrete coating

3.35

test report

document that provides the quantitative test results for tests conducted in accordance with the requirements of this document