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1. Start by
greasing the shiny side of the "all in one" SanPlat Mould with clean
motor oil or grease on a cloth, even on the outsides. The oil will protect the surface of
the mould from being destroyed by the cement.
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2. Wash the sand
and stone if you have any doubts about its purity and let it dry before mixing
with the cement. Dust and impurities make the concrete weak.
Mix cement with dry and clean sand and stone in the
proportions 1+2+2 (or 1+2+3), add very little water and mix well.
Divide in two parts and add extra water and cement to
the softer one of the heaps to make it liquid. Stir well in bucket or mortar basin. |
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3. Pour the liquid
concrete in the mould and tap/hammer gently on the mould with a piece of wood to
release air bubbles from the plastic surface. (If not you may get plenty of small holes in
the surface of the SanPlat.)
Put in reinforcement bars as required before adding
the very stiff concrete to cover well the reinforcement. Extra reinforcement may be
required for transport reasons.
Compact the concrete with a piece of wood until the
cement water comes up to the surface. (You may choose to start an other slab while the
water soaks up.)
If it was too wet use less water for the next one. |
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4. Write the date,
your initials and the number of the SanPlat in the fresh concrete. Start with no
1 and continue with 2 on the next one etc. You may need to sprinkle some sand-cement at
the place of writing. The Initials, date and the number will help you to monitor the
production and the progress.
While still soft, put the mould on a flat surface and
allow to harden for one or two days. Using two planks under the footrests you can pile the
ones that are ready and save space. |
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5 When hard
enough, turn the mould very gently over soft sand or grass to get the SanPlat out
of the mould. Don't let it fall! It is still very weak.
Clean the mould with a soft cloth and some oil and it is
ready to be used again. Do not use sharp objects or stones to remove concrete rests from
the plastic. It will destroy the surface |
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6. Put the SanPlat
(and the moulds) in the shadow not to catch too much sun, cover with plastic and
sand and keep the SanPlat wet for one week. |
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7. A lid
of concrete can be made using a special mould, but you can also use the back side of the
"all in one" mould as a mould for the lid.
Oil will protect the SanPlat from sticking to the fresh cement. The
handle can be made of a piece of reinforcement bar well fixed in the concrete. Put in
extra reinforcement to make it extra strong.
Keep it wet for one week to cure properly. |
