Civil Engineering Reference
In-Depth Information
and deficient designed containment reinforcement.
3.2.4 Supporting the structure while the repair is placed
Simply cutting out and filling the hole with a repair material will often be
ineffective for a structural repair, as the repair will not contribute to carrying
dead load and shrinkage and creep often result in it carrying little live load.
Supporting the structure during repair (Canisius et al., 2002) so that it
fully gains strength and stiffness before load is reapplied will enable it to
contribute more fully to overall strength.
Common prudence as well as Health and Safety require support to carry
load and ensure stability when structures are being opened up for repair.
This is particularly important when the degree of deterioration is uncertain
and cutting out may extend beyond what was originally envisioned. Flat
slabs around column heads of all types need particular caution.
3.2.5 Matching the repair to the concrete
The fundamental need for strain compatibility of repair (
Figure 3.9)
was
spelt out nearly 2000 years ago, in the Bible, in Matthew 9:16.
No man putteth a piece of new cloth unto an old garment, for that
which is put in to fill up taketh from the garment, and the rent is made
worse.
