When I put in the 4x4x6 base for my TriEx WT51 crank up back in 1993 I
used commerically obtained "six sack" concrete ReadyMix which was
supposedly the same specs for interstate highway overpasses. The truck
mixed it out in front of my house and they pumped it to the back yard.
I let mine cure for nearly two months and since we poured it in the
summer I sprinkled the top several times a day very lightly with a water
mist. It had "hardened" by the next day in the Texas heat, but I let it
cure way past the normal specs just to add a safety margin.
The area where I live is permeated with underground springs just under
the surface a couple feet or more so I didn't worry too much about the
concrete at the bottom of the hole curing too fast. The first hole I
had dug filled with 6 feet of water over night, so when we redid a new
hole a few feet over we dug it and poured concrete all the same day.
The only place I used concrete forms was to form the 4x4x1 foot top
that elevated the tower base just above ground level.
Alan NV8A wrote:
>My understanding is that -- in the US, at least -- the specified
>strength of concrete is achieved only after 28 days. What percentage it
>would have achieved after two days, a week, two weeks, etc., I don't know.
>I have been quoted an 8-week delivery delay for the tower I have in
>mind, but I can get the base plate and bolts delivered ahead of time so
>that the concrete will have had at least the full four weeks to harden
>before I put any load on it.
>On 07/31/06 11:23 am ADRIAN REES wrote:
>>Over here in the UK, I am about to "plant" 4 towers, and pour C35 Grade
>>Concrete in the bases. Anyone know what is the setting time for this stuff,
>>and can it poured in one or two lots ? Getting this amount of concrete onto
>>the site is not easy. I live up a mountain, with access limited to 4 Wheel
>>Drive vehicles, and certainly a Truck will be near impossible to get on site,
>>let alone a Ready Mix Concrete one ! So I may have to mix on site, and pour
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