Here follows information from various sources regarding Exposure classes used in StruSoft PRE-Stress and StruSoft Frame Analysis

Environmental classes

92848_-_denmark_flag.png The Danish annex defines environmental classes instead of exposure clases.

 Environmental classPassiveModerateAggressiveExtra aggressive
Country92848_-_denmark_flag.png 1)
  

X0

XC2

XD1

XD2

  XC1XC3XS1XD3
   XC4XS2XS3
   XF1XF2XF4
   XA1XF3XA3
    XA2 

92848_-_denmark_flag.png1): DS/EN 1992-1-1 DK NA:2017

Maximum w/c ratio and Minimum concrete strength

92874_-_britain_flag_great.png The British annex gives different maximum w/c-ratios and minimum concrete strengths depending on the concrete cover that is chosen. That is why several w/c-values and strength classes are shown in the table below. For some exposure classes the values even depends on the cement type in the concrete.

36122_-_information.png

The table below is wider than the screen.
Press (and release) middle mouse button to scroll sideways in the table 35662_-_application_contract_side.png64481_-_mouse_scroll_select.png35663_-_application_expand_side.png

 Exposure classDescriptionMaximum w/c-ratioMinimum strength class
Country  

  92861_-_european_flag_union.png1)

92997_-_flag_sweden.png1)92874_-_britain_flag_great.png1)

92861_-_european_flag_union.png2)

92874_-_britain_flag_great.png1)
Life class    L50L100 L50L100
 X0No risk of corrosion attack----C12/15--
 XC1Carbonation-induced corrosion0.650.900.700.70C20/25C20/25C20/25
 XC2Carbonation-induced corrosion0.600.600.650.65C25/30C25/30C25/30
 XC3Carbonation-induced corrosion0.550.550.65 - 0.450.60 - 0.45C30/37C25/30 - C40/50C28/35 - C40/50
 XC4Carbonation-induced corrosion0.500.550.65 - 0.45No value givenC30/37C25/30 - C40/50No value given
 XD1Chloride-induced corrosion (De-icing salt)0.550.450.60 - 0.45No value givenC30/37C28/35 - C40/50No value given
 XD2Chloride-induced corrosion (De-icing salt)0.550.450.55 - 0.40No value givenC30/37C20/25 - C40/50No value given
 XD3Chloride-induced corrosion (De-icing salt)0.450.400.50 - 0.35No value givenC35/45C25/30 - C45/55No value given
 XS1Chloride-induced corrosion (Sea water)0.500.450.55 - 0.35No value givenC30/37C25/30 - C50/60No value given
 XS2Chloride-induced corrosion (Sea water)0.450.450.55 - 0.40No value givenC35/45C20/25 - C40/50No value given
 XS3Chloride-induced corrosion (Sea water)0.450.400.50 - 0.35No value givenC35/45C25/30 - C45/55No value given
 XF1Freeze/Thaw attack0.550.60No value givenC30/37No value given
 XF2Freeze/Thaw attack0.550.45No value givenC25/30No value given
 XF3Freeze/Thaw attack0.500.55No value givenC30/37No value given
 XF4Freeze/Thaw attack0.450.45No value givenNo value givenNo value given
 XA1Aggressive chemical environments0.550.50No value givenC30/37No value given
 XA2Aggressive chemical environments0.500.45No value givenC30/37No value given
 XA3Aggressive chemical environments0.450.40No value givenC35/45No value given

92861_-_european_flag_union.png 1): EN 206:2013+A1:2016, Annex F, Table F.1

92861_-_european_flag_union.png 2): EN 1992-1-1:2004, Annex E, Table E.1N

92997_-_flag_sweden.png 1): SS 13 70 03:2002

92874_-_britain_flag_great.png 1): NA to BS EN 1992-1-1:2004, Table NA.2 and Table NA.3

Accepted crack width

For exposure class XF no values are given since they are to be combined with any other exposure class.

92861_-_european_flag_union.png EuroCode uses a special criteria for prestressing tendons called "Decompression". 

PRE-Stress assumes XD3 are part of this group too, since it is missing from the table. The condition of the prestressing wires are either OK and well within concrete in compression or placed in concrete in tension, or close to it (and in that case in need of a modification if the exposure class and load combinations so require). Then it will give a warning about strands in tension and a code reference. If it gives a warning the user has to check if it is ok or not to have the strands in a region with tension in the concrete or close to the tension zone. For decompression checks PRE-Stress will give an indication if the prestressing strand is in need of a compression check or not. It is not part of any utilization check, so the element might pass the utilization check even if there is a decompression check.

92848_-_denmark_flag.png The Danish annex is very straight forward when it comes to crack widths.

92951_-_flag_norway.png The Norwegian annex says that XD3 should be included with same parameters as XD1, XD2, XS1, XS2 and XS3.

92997_-_flag_sweden.png In the Swedish annex, no values are given for XA-classes. 

PRE-Stress and Frame Analysis uses 0.30 and 0.20 by default.

36122_-_information.png

The table below is wider than the screen. Press (and release) middle mouse button to scroll sideways in the table 35662_-_application_contract_side.png64481_-_mouse_scroll_select.png35663_-_application_expand_side.png

 Exposure classDescription

Accepted crack width

wk [mm]

Country  92861_-_european_flag_union.png 3)92848_-_denmark_flag.png 1)92951_-_flag_norway.png 1)

92997_-_flag_sweden.png 2)

   

Reinforcement and post tension cables

(Quasi-permanent)

Prestressing tendons

(Frequent)

Environmental class

ReinforcementPrestressing and post tensioned reinforcement 

Reinforcement and post tension cables

(Quasi-permanent)

Prestressing tendons

(Frequent)

 Corrosion sensitiveCorrosion resistant

Life class →

L100L50L20L100L50L20
 X0No risk of corrosion attack0.40.2PassiveNo value givenX00.40.2X0------
 XC1Carbonation-induced corrosion0.40.2PassiveNo value givenXC10.40.2XC10.400.45-0.45--
 XC2Carbonation-induced corrosion0.30.2Moderate0.40.3XC20.30.2XC20.300.400.450.400.45-
 XC3Carbonation-induced corrosion0.30.2Moderate0.40.3XC30.30.2XC30.200.300.400.300.40-
 XC4Carbonation-induced corrosion0.30.2Moderate0.40.3XC40.30.2XC40.200.300.400.300.40-
 XD1Chloride-induced corrosion (De-icing salt)0.3DecompressionAggressive0.30.2XD10.3DecompressionXD10.150.200.300.200.300.40
 XD2Chloride-induced corrosion (De-icing salt)0.3DecompressionExtra aggressive0.20.1XD20.3DecompressionXD20.150.200.300.200.300.40
 XD3Chloride-induced corrosion (De-icing salt)No value given
0.3
No value given, 
Decompression
Extra aggressive0.20.1XD30.3DecompressionXD30.100.150.200.150.200.30
 XS1Chloride-induced corrosion (Sea water)0.3DecompressionAggressive0.30.2XS10.3DecompressionXS10.150.200.300.200.300.40
 XS2Chloride-induced corrosion (Sea water)0.3DecompressionAggressive0.30.2XS20.3DecompressionXS20.150.200.300.200.300.40
 XS3Chloride-induced corrosion (Sea water)0.3DecompressionExtra aggressive0.20.1XS30.3DecompressionXS30.100.150.200.150.200.30
 XF1Freeze/Thaw attackNo value givenModerate0.40.3XF1No value givenXF1No value given
 XF2Freeze/Thaw attackNo value givenAggressive0.30.2XF2No value givenXF2No value given
 XF3Freeze/Thaw attackNo value givenAggressive0.30.2XF3No value givenXF3No value given
 XF4Freeze/Thaw attackNo value givenExtra aggressive0.20.1XF4No value givenXF4No value given
 XA1Aggressive chemical environmentsNo value givenModerate0.40.3XA1No value givenXA1No value given, 0.30No value given, 0.20
 XA2Aggressive chemical environmentsNo value givenAggressive0.30.2XA2No value givenXA2No value given, 0.30No value given, 0.20
 XA3Aggressive chemical environmentsNo value givenExtra aggressive0.20.1XA3No value givenXA3

No value given, 0.30

No value given, 0.20

92861_-_european_flag_union.png3): EN 1992-1-1:2004, Table 7.1N

92848_-_denmark_flag.png1): DS/EN 1992-1-1 DK NA:2017

92951_-_flag_norway.png1): NS-EN 1992-1-1:2004+A1:2014+NA:2018

92997_-_flag_sweden.png2): BFS 2019:1 (EKS 11)

Crack safety factor

92997_-_flag_sweden.png The crack safety factor is a unique factor used in the Swedish Annex (BFS 2019:1, EKS 11)

For exposure class XF no values are given since they are to be combined with any other exposure class.

 Exposure classDescription

Crack safety factor

ζ [-] 

Country  92997_-_flag_sweden.png 2)
Life class  L100L50L20
 X0No risk of corrosion attack0.90.90.9
 XC1Carbonation-induced corrosion0.90.90.9
 XC2Carbonation-induced corrosion1.00.90.9
 XC3Carbonation-induced corrosion1.21.01.0
 XC4Carbonation-induced corrosion1.21.01.0
 XD1Chloride-induced corrosion (De-icing salt)1.51.21.0
 XD2Chloride-induced corrosion (De-icing salt)1.51.21.0
 XD3Chloride-induced corrosion (De-icing salt)1.81.51.2
 XS1Chloride-induced corrosion (Sea water)1.51.21.0
 XS2Chloride-induced corrosion (Sea water)1.51.21.0
 XS3Chloride-induced corrosion (Sea water)1.81.51.2
 XF1Freeze/Thaw attackNo value given
 XF2Freeze/Thaw attackNo value given
 XF3Freeze/Thaw attackNo value given
 XF4Freeze/Thaw attackNo value given
 XA1Aggressive chemical environments   
 XA2Aggressive chemical environments   
 XA3Aggressive chemical environments   

92997_-_flag_sweden.png 2): BFS 2019:1 (EKS 11) 

Created by Fredrik Lagerström on 2021/02/24 08:48
Copyright 2020 StruSoft AB
PRE-Stress Documentation