[TowerTalk] concrete forms

[Pete Smith]

It's also worth remembering that the load on the base of a guyed tower is a LOT less than that applied by any sort of self-supporter -- a former contributor, I think it was N4KG, didn't even use concrete bases on some of his guyed towers, which were just footed on the (hard) ground.  

If I recall correctly, it has also been said here that concrete gains a relatively large percentage of its final strength in the first week, even though it takes a month to reach its full rating.

73, Pete N4ZR

At 12:31 PM 7/31/2006, 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.
>
>Alan NV8A
>
>
>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 in batches.
>>  
>> Comments ?
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