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Eurocode 2 Concrete nominal cover and minimum concrete class for durability (reinforcement bars and prestressing tendons)

Description:
Calculation of required nominal concrete cover cnom for reinforcement steel and prestressing steel
According to:
EN 1992-1-1:2004+AC2:2010 Section 4.4, Annex E
Supported National Annexes:
Nationally Defined Parameters (NDPs) automatically filled for supported countries
All Calculations
Input
MPa
e.g. 30 MPa for concrete class C30/37. For a list of concrete classes see Table of Concrete Design Properties
mm
Exposure classes for durability related to environmental conditions in accordance with EN 206-1 as specified in EN1992-1-1 Table 4.1 for carbonation-induced corrosion (XC), chloride-induced corrosion from sea water (XS), and chloride-induced corrosion other than from sea water (XD).
Exposure classes for attack related to environmental conditions in accordance with EN 206-1 as specified in EN1992-1-1 Table 4.1 for freeze/thaw attack (XF) and attack in aggressive chemical environments (XA). Use X0 where there is no risk of freeze/thaw or chemical attack.
Exposure classes related to environmental conditions in accordance with EN 206-1
X0No risk of corrosion or attack - Very dry (concrete inside buildings with very low air humidity)XD1Chlorides - Moderate humidity (surfaces exposed to airborne chlorides)
XC1Carbonation - Dry or permanently wet (interior of buildings with very low air humidity, permanently submerged in water)XD2Chlorides - Wet or rarely dry (swimming pools, exposure to industrial waters containing chlorides)
XC2Carbonation - Wet, rarely dry (long-term water contact, many foundations)XD3Chlorides - Cyclic wet & dry (bridge parts exposed to spray containing chlorides, pavements, car park slabs)
XC3Carbonation - Moderate humidity (interior of buildings with moderate or high air humidity, external concrete sheltered from rain)XS1Sea water - Airborne salts not in direct contact with sea water (structures near to or on the coast)
XC4Carbonation - Cyclic wet & dry (concrete subject to water contact not within exposure class XC2)XS2Sea water - Permanently submerged (parts of marine structures)
XF1Freeze/Thaw - Moderate water saturation without de-icing agents (vertical concrete surfaces exposed to rain and freezing)XS3Sea water - Tidal splash & spray zones (parts of marine structures)
XF2Freeze/Thaw - Moderate water saturation with de-icing agents (vertical concrete surfaces of road structures exposed to freezing and airborne de-icing agents)XA1Chemical attack - Slightly aggressive chemical environment (natural soils and ground water according to EN 206-1 Table 2)
XF3Freeze/Thaw - High water saturation without de-icing agents (horizontal concrete surfaces exposed to rain and freezing)XA2Chemical attack - Moderately aggressive chemical environment (natural soils and ground water according to EN 206-1 Table 2)
XF4Freeze/Thaw - High water saturation without de-icing agents (road and bridge decks exposed to de-icing agents, concrete surfaces exposed to direct spray containing de-icing agents and freezing, splash zones of marine structures exposed to freezing)XA3Chemical attack - Highly aggressive chemical environment (natural soils and ground water according to EN 206-1 Table 2)
years
Design working life of 50 years corresponds to structures of average importance.
True if position of reinforcement is not affected by construction process, such as in slabs without link reinforcement.
Nationally Defined Parameters
According to EN1992-1-1 §4.4.1.3(1), §4.4.1.3(3) and the National Annex. A value different than 10 mm may be appropriate for certain cases according to the National Annex (e.g. precast elements).
Nationally Defined Parameters corresponding to EN1992-1-1 sections 4.4.1.2(3), 4.4.1.2(5), 4.4.1.2(6), 4.4.1.2(7), 4.4.1.2(8), 4.4.1.2(13), 4.4.1.3(4).
The inspection depending on inspection levels is specified in prEN 13670, where Execution Class 1 corresponds to the relaxed inspection level, Execution Class 2 corresponds to the normal inspection level, and Execution Class 3 corresponds to the tightened inspection level.
Maximum equivalent water-to-cement ratio used in concrete composition, corresponding to vctekv in the National Annex of Sweden, Table 4.4N. Larger values are more unfavorable.
Cement types affecting concrete cover are defined in Código Estructural - 2021, Article 44, depending on the exposure class. See table below.
Categories of cement that affect concrete cover according to Código Estructural - 2021, Article 44
Exposure classesCategory 1Category 2Category 3
X0Any cementAny cementAny cement
XC1, XC2, XC3CEM IOther types of cement or in the case of using additives to concrete-
Reinforced concrete: XS1, XS2, XS3, XD1, XD2, XD3CEM III/A, CEM III/B, CEM IV, CEM II/B-V, CEM II/A-D or concrete with the addition of microsilica greater than 6% or fly ash greater than 20%CEM II/B-S, B-PRest of usable cements, according to Article 28
Prestressed concrete: XS1, XS2, XS3, XD1, XD2, XD3CEM II/A-D or CEM I with addition of silica fume greater than 6%Rest of usable cements, according to Article 28-
XF1, XF3CEM IIIOther types of cement-
XF2, XF4CEM II/A-DCEM IIIOther types of cement or in the case of using additives to concrete
XA1CEM III, CEM IV, CEM II/B-S, B-P, B-V, A-D or concrete with the addition of microsilica greater than 6% or fly ash greater than 20%Rest of usable cements-
XA2, XA3Any cementAny cementAny cement
Note: Always verify the validity of the Nationally Defined Parameters (NDPs). Please inform us of any discrepancy using our Contact Form. The NDP value is left blank for all NDPs that we do not have this information available. Interested users who have access to the corresponding NDPs can notify us using our Contact Form to fill-in the missing information.