I used a mixture of 2 parts silica sand; 2 parts Koalin, 1 part
portland cement, small amount of nylon fiber and small amount of Q
cells. I used latex as activator for the concrete. I had quite a bit
more shinkage than I thought I would get. I mixed ingrediaents and then
poured. Should I have waited to pour until concrete started to set up?
Should I alsways expect shinkage? What can I do to minimise it?
Thanks for any help.
As the concrete cures, water evaporates out. This is part of the
shrinkage. Less water means less shrinkage. Stiffer conctrete requires
vibration and or more working to get all of the voids out. There are a
number of additives that can be used. One is called Recover. I used it
a lot when pouring counter tops. Others are called 'plasticizers'. They
allow the concrete to act like it has more water in it than it really
does. The down side to these is that it tends to give the conctete a
texture like silly putty, and makes it harder to work. Concrete will
shrink and expand with temperature changes. On smaller slabe this isn't
significant. On the Golden Gate Bridge, this can mean elevation changes
of 5 or so feet during the day.
Gerald Ross wrote:
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