International Scholarly Research Notices / 2014 / Article / Tab 2

Review Article

Properties of Concrete at Elevated Temperatures

Table 2

Values of the main parameters of the stress-strain relationships of NSC and HSC at elevated temperatures as specified in EN1992-1-2: 2004 [4].

Temp. °FTemp. °CNSCHSC
Siliceous agg.Calcareous agg.
      Class 1Class 2Class 3

682010.00250.0210.00250.02111
21210010.0040.022510.0040.0230.90.750.75
3922000.950.00550.0250.970.00550.0250.90.750.70
5723000.850.0070.02750.910.0070.0280.850.750.65
7524000.750.010.030.850.010.030.750.750.45
9325000.60.0150.03250.740.0150.0330.600.600.30
11126000.450.0250.0350.60.0250.0350.450.450.25
12927000.30.0250.03750.430.0250.0380.300.300.20
14728000.150.0250.040.270.0250.040.150.150.15
16529000.080.0250.04250.150.0250.0430.080.1130.08
183210000.040.0250.0450.060.0250.0450.040.0750.04
201211000.010.0250.04750.020.0250.0480.010.0380.01
2192120000000

The Eurocode classifies HSC into three classes*, depending on its compressive strength, namely,
(i) class 1 for concrete with compressive strength between C55/67 and C60/75,
(ii) class 2 for concrete with compressive strength between C70/85 and C80/95,
(iii) class 3 for concrete with compressive strength higher than C90/105.
The strength notation of C55/67 refers to a concrete grade with a characteristic cylinder and cube strength of 55 N/mm2 and 67 N/mm2, respectively.
*Note: where the actual characteristic strength of concrete is likely to be of a higher class than that specified in the design; the relative reduction in strength for the higher class should be used for fire design.

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