Issue 63

L. A. Aboul-Nour et alii, Frattura ed Integrità Strutturale, 63 (2023) 134-152; DOI: 10.3221/IGF-ESIS.63.13

Figure 8: Layered hollow core slab set-up.

E XPERIMENTAL RESULTS Test of hardened concrete

F

or push-out tests, triplet specimens without any connection method have the lowest shear bond strength of less than 1 MPa, so it isn’t a suitable way to connect the two layers of the tested slabs, while triplet specimens with bond agent material failed with a crack that went through the bond agent material without any damage to particles. The triplet specimens with shear dowels gave a peak shear bond strength value of more than 1 MPa and there was good contact at the interface without any particle damage, so the bond agent material and shear dowel connection methods can be used to connect the two layers of the tested slabs. Test results for push-out tests are given in Tab. 6, and the mode of failure is shown in Fig. 9.

Conn. method

Bond strength (MPa)

without

.837

Bond agent

1.665

Shear dowels

1.727

Table 6: Push-out test results.

Figure 9: Mode of failure for push out test specimens; (a) triplets without connection method, (b) triplets with bond agent material, and (c) triplets with shear dowels.

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