PSI - Issue 28

5

Flavio Stochino et al. / Procedia Structural Integrity 28 (2020) 1467–1472 Author name / Structural Integrity Procedia 00 (2019) 000–000

1471

16.00

14.00

y = 24826x ‐ 0.5267 R² = 0.9418

12.00

10.00

8.00

6.00 Stress (MPa)

4.00

2.00

0.00

0

0.0001

0.0002

0.0003

0.0004

0.0005

0.0006

0.0007

Strain

Fig. 5. Concrete elastic modulus evaluation.

70,000

60,000

50,000

40,000

30,000

20,000

y = 3.9879x 2 + 475.02x + 38694 R² = 0.8682

10,000 Long. Elastic Modulus (MPa)

0

0

-20

-40

-60

-80

-100

-120

-140

-160

-180

-200

Temperatures ( ° C)

Fig. 6. Concrete elastic modulus Vs temperature.

The same procedure has been adopted for each cube at different temperature, obtaining a set of twelve secant elastic modulus values. Indeed, only the tests in which the temperatures were accurately measured have been considered for this analysis. The aim of this work is to relate these values to the corresponding temperatures in order to find a global trend. Figure 6 presents the relationship between the obtained elastic modulus and the temperatures. As expected,