PSI - Issue 66

Jonathan Duarte Oliveira et al. / Procedia Structural Integrity 66 (2024) 313–319 Author name / Structural Integrity Procedia 00 (2025) 000 – 000

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Table 1. Input data.  [kg/m 3 ]

E [GPa]

f [N/m]

 p [-]

G

1870.97

7.43

15.00

1.14 . 10 -4

More precisely, the value of the material density falls in the experimental range equal to 1870.97 ± 13.10 kg/m 3 ; the elastic modulus is measured by four-point bending testing; the mean value of the energy release rate is computed according the CEB-FIP Model CODE (1990) recommendation, by assuming a compressive strength equal to 4.80 MPa; the critical strain is computed by considering a tensile strength measured by indirect tensile testing and equal to 0.85MPa. The random field has a coefficient of variation equal to 50% and a correlation length in x, y and z directions equal to 3 mm. 3.3. Results Four different random fields are considered for the energy release rate. The numerical average compressive strength obtained is equal to 4.78±0.01 MPa, with a relative difference with respect to the experimental value (4.80 ± 0.51 MPa) equal to -0.4%. The four failure configurations corresponding to the above different random fields, are reported in Figure 4, where the broken elements, corresponding to a crack, are in black, whereas the unbroken ones are in grey. The numerical failure configurations agree with the experimental ones, as that presented in Figure 2(b).

Fig. 4. Numerical failure configurations corresponding to four different random fields for the energy release rate.

4. Conclusions In this work the experimental and numerical compressive strength of a specific mixture of pervious concrete has been investigated. The experimental campaign, performed at the Civil Engineering Laboratory of the Federal University of Pampa in Brazil, has been performed to measure both physical and mechanical properties of the material, whereas the numerical analysis has been performed to simulate the mechanical behaviour under compression of the examined material, by using the LDEM formulation implemented in the Abaqus/Explicit environment. It has been found that: - the numerical average compressive strength obtained is equal to 4.78 ± 0.01 MPa, with a relative difference with respect to the experimental value (4.80 ± 0.51 MPa) equal to -0.4%; - the numerical failure configurations agree with the experimental ones. 5. Future work The next step of the present research is to develop a high quality nanomodified pervious concrete in order to allow an increasing use in civil engineering projects. More precisely, the future work will be conducted to enhance the