Mixing Concrete For Casting.
so here we are today and we're gonna concentrate on looking at our
concrete mix so uh as usual we've got one part cement
two parts sand two parts aggregate bonder and plasticizer now i'm just
mixing this dry and that's the sand and the aggregate we've got there
so you just want to mix that in together and now we're going to uh
introduce the cement so that's three parts
cement to six parts aggregate and six parts sand
so i'm just mixing that in dry and once we've got that
mixed in we will put in some bondo and some plasticizing at the appropriate
quantities the plaster sizes should be round about
between 0.5 and 1 on this particular plasticizer so now we're introducing the
water and we're going to aim for a consistency
that isn't um too solid
that is hard to move around but isn't too
fluid either or watery so we want a mix which is easy you can easily move around
but it stays firm also so that's what we've got there after mixing it
with our mixing tool so like as you can see that i'm
messing with the trowel and it stays in place when you move it around
but when we vibrate it it moves around relatively easy so that's what we want
so we don't want it all slushy or anything like that
i think a lot of people call it like a slurry mix but it's kind of a stiff
slurry if you get my drift so anyway
i just wanted to show you the consistency of the cement concrete
in this video concrete not cement the cement goes into the concrete
of course and uh so of course i'm just showing you just to just like
quickly run through me filling up the molds so we just fill
it part way give it a tap vibrate some arrow fill up some more
fill up some more vibrate more air out and so on
and uh so there you can just see the consistency of that uh concrete
and we will put these on the vibrating table also
so we're also lining up the molds with some watered-down soapy water to give it
a little bit of guidance as it finds the detail inside
the mold
that kind of helps instead of just pouring it in dry
or onto a dry mold i should say it kind of helps me out
and we're just vibrating there we're just tapping the air out by hand but we
will also put them on the vibrating table for
about 30 seconds each also so just putting the excess
concrete in a bag there um so that'll gauge the hardness of the cone cream i
could have filled up another mold because i've got some small
molds hanging about but i've had a bit of a clear out so i can't find
some of my items at the moment but i always find it handy to
stick a little bit of cement into a bit of plastic bag or something to see where
we're at so there we are just vibrated the
vibrated the air any excess air out of the molds with the
vibrating table cover them up and then we'll wait a
night or two and then we'll demold so there's the uh
existing cast that we've done over the last couple of weeks and there we are
that's the concrete mix basic concrete mix
what you want to aim for uh the consistency to
um pour into molds for concrete stature so thanks for
watching see you soon and over and out for now
you