Advanced Structural
Designs ACN 097 789 87
92 Vasey Cres CAMPBELL ACT 2612 Telephone
61612171
Facsimile 61612170 Email mal@structuraldesigns.com.au
How can I
clean and repair my fire damaged slab on ground?
After the recent
Generally speaking slabs on ground don’t fair all that badly due to the
fact that the maximum temperatures are above rather than below the fuel source
and if there is damage it is often confined to the top 3 or 4 mm of the
slab. If there is any damaged concrete
around from edge spalling we have a look at the top few mm for the colour
changes that often occur with some of local (iron rich) aggregates.
We suggest cleaning the slab with a heated high pressure water jet (over
3500 PSI) and see how it scrubs up. If
it is almost perfect you can use some Floorclean by MBT which should lift the
remainder with 1 or 2 applications.
Floorclean is $132 plus tax for a 20 litre drum.
If you think you have lost some surface hardness we can confirm your
suspicion with a Schmitt Hammer or you can go straight to the next step and
treat with a surface hardener which is around $20/m^2.
If you want a Rolls Royce solution (in terms of abrasion resistance) you
can get an application like Ad-tex for around $30/m^2 that was used on Magnet
Mart in Gungahlin. This may need a non
slip additive though if you are doing it in an exposed driveway. The loss of surface strength is not just an
issue for exposed slabs you will also find tiles and parquetry lifting if you
fix them to a weak substrate so if you have any doubts have a professional
assessment carried out.
If you have existing shrinkage cracks they will reflect through whatever
you do.