Was [AT] Scrap iron (Now Floating cement)

[D8RMAN at aol.com]

We have a floating concrete bridge here in Washington state. It is on  
highway 520. Willard Smith, Tacoma, WA.

Probably  sank!
----- Original Message ----- 
From: "charlie hill"  <chill8 at cox.net>
To: "Antique tractor email discussion group"  <at at lists.antique-tractor.com>
Sent: Tuesday, April 12, 2005 9:19  PM
Subject: Re: [AT] Scrap iron


> There used to be a concrete  hulled sail boat around these parts.  I don't 
> know what ever  happened to it.  I haven't seen it in a number of years. 
> The  hull was about 30 feet long if I remember right.
>
>  Charlie
> ----- Original Message ----- 
> From: "Guy Fay"  <fayguyma at execpc.com>
> To: "Antique tractor email discussion  group" 
> <at at lists.antique-tractor.com>
> Sent: Tuesday,  April 12, 2005 8:11 PM
> Subject: Re: [AT] Scrap  iron
>
>
>> Actually, a lot of civil engineering schools  sponsor concrete canoe race 
>> teams- UW Madison holds the  championship this year. They make some pretty 
>> exotic mixes, the  stuff will float. The trick is to get the strength in 
>> there.  Vermiculite is a common ingrediant.
>> GUy
>>
>>  Gene Waugh  wrote:
>>
>>>Mike,
>>>
>>>This  won't help anything, but just as a point of interest... ALUMINUM is  
>>>heavier than concrete, but it's harder to fit tightly in a  drum without a 
>>>lot of  heat.
>>>
>>>George  Willer
>>>-----------------------------------------------------
>>>
>>>Man,  George, I sure just learned something!  I see that aluminum is  about
>>>164 lbs/cu ft, and concrete is 90 - 125 lbs / cu  ft.  Who woulda thunk  
>>>it!!
>>>
>>>Thanks,
>>>
>>>Gene