The practice of predictive maintenance (through periodic
inspections) depends on the efficiency of in situ evaluations of the
in-service performance of the constructive solutions, which in turn
depends on a set of logical procedures inherent to a performance based methodology and a correct diagnosis.
In situ tests are a precious auxiliary tool for visual inspections,
since they allow the detection of gross diagnosis mistakes, reduce
the subjectivity of visual inspections and enable a more accurate
assessment of the real maintenance needs. These tests have
limitations, however, and depend on the technique used (often
the limited precision of a technique only allows a qualitative
analysis) and the experience of the practitioners. In situ tests for
rendered fac¸ades include a variety of tests and techniques, most of
them not standardised, and therefore a coherent and global
classification is sometimes difficult to establish.
In this paper a methodology for choosing the most adequate
in situ techniques to diagnose in-service performance of rendered
fac¸ades is proposed. The subjects of this analysis were current and
expedient techniques, used in several inspections performed in different renders, within the PhD research work of the first author.
These techniques are classified and also characterised in terms
of the data collected (parameters measured), their contribution to
understanding in-service performance (analysis of relevant
properties), the degradation state (anomalies and their causes)
and their relation to maintenance needs. Finally, they are
compared and rated using various criteria and evaluated in terms
of their adequacy for in situ assessment.
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