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Normal-Weight Concrete
Lightweight Concrete
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Lightweight Concrete Mechanical Properties

PrEN 1994-1-2 adopts the same stress-strain relationship model for lightweight concrete as normal-weight concrete. The model is given in Figure 1.

Figure 1: Stress-strain Relationship of Concrete under Compression at Elevated Temperatures

However, the code only provides the values for the reduction of strength kc ,θ = fc ,θ / fck as shown in Table 1. The values of the strain corresponding to fc ,θ should be obtained from tests. The strength reduction factor of lightweight concrete is compared to those of normal-weight concrete in Figure 2. Lightweight concrete has better strength retention than normal-weight concrete.

Figure 2: Reduction of Strength for Normal-weight and Lightweight concretes at Elevated Temperatures

Material Behavior
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