[TowerTalk] FW: Concrete Pad for U.S. Tower TX-472

[Roger (K8RI) on TT]

I had no problem keeping it wet.  The spring water table was just a 
couple inches below the surface. We kept a sump pump running until the 
concrete was being poured into the hole.   It was a good dry mix 
relatively speaking, yet when the concrete reached the top, it was 
pushing out water.

As I was breaking up the over flow a couple weeks later, someone asked, 
"Wouldn't it be easier to just paint it green?"  The dirt under the 
hardened overflow was still soggy.  So other than sprinkling the 
surface, keeping it wet was not a problem<:-)

73

Roger (K8RI)



On 7/25/2015 9:16 PM, Patrick Greenlee wrote:
>
>
> On 7/25/2015 4:22 PM, Roger (K8RI) on TT wrote:
>> Don't rush!  I'd wait the full 28 days.
>>
>> , no stress on the concrete for 6 weeks after the pour.
>>
>> Even lowering the tower straight down, that is still a fair 
>> load/stress for concrete not fully cured, or at least almost cured.  
>> The last few % takes a long time.
>>
>> They stressed that with concrete, let it cure properly and don't rush!
>>
>> 73, Roger  (K8RI)
> The % of cure asymptotically approaches its final value (gets closer 
> and closer at a slowing rate of approach) so that theoretically it 
> never quite finishes curing but gets close enough for most practical 
> purposes (90% of the final strength) in 28 days if the temps aren't 
> extreme (hot or cold.) Keeping the pour wet, especially the first 
> several days is a good tactic.
>
> Patrick



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