Civil Engineering Reference
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Fig. 5.11
The spraying of the
heat-resistant cladding
(Fendolite) aided by a
robot
of various steel fastenings which are anchored through the heat-resistant
cladding into the concrete of the lining. Due to the carrying out of fire tests,
in which different bolt configurations were tested, it was examined to what
extent such leaks increase the dangers of spalling. 'Nature' appeared to be
rather mild: only at the mounting of the ventilators did spalling take place at
one of the two simultaneously tested mounting positions. Although the
phenomenon of spalling of concrete itself could not be accurately calculated,
it was possible to calculate the time-dependent heat penetration around the
ventilator mounting by means of a finite elements programme. As can clearly
be seen in the figure, the ventilator mounting forms a thermal leak. In view
of the test results, the mounting was adapted and tested. Due to the reduction
of the surface of the means of fastening and thus the degree of thermal leakage,
it appeared that the means of fastening still complies with the requirements.
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