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[TowerTalk] Concrete with Lead added (?)

Subject: [TowerTalk] Concrete with Lead added (?)
From: "Pat Barthelow" <>
Date: Wed, 17 Jan 2007 15:22:16 -0800
List-post: <>

Has anyone heard of adding lead to concrete mixes, to increase 
weight/density?  I just was told that the Jamesburg Earth Station, with huge 
amount of  concrete and rebar required for the self supporting 30 meter 
diameter dish building and foundation, had some sort of lead shot entrained 
in the concrete, in order to increase weight, and, ostensibly to reduce the 
foundation volume required to support the (free standing)  big dish.  Rumor 
had it,  some of the concrete trucks [see below] broke drive train and 
suspension components, due to their  loads' extra heavy weight due to the 
lead that was put in the concrete.   I am trying to validate the story.  In 
the photos below, the concrete portion of the  antenna support pedestal,  
extends to the point where the attachment bolts can be seen at the perimeter 
of the base of the steel turret.  The concrete continues to a deep and 
heavily reinforced foundation.
Is it possible that, like any free standing tower, WEIGHT is the driving 
factor in foundation deisgn, and in order to reduce cubic yards of 
excavation, and concrete, that lead was added to get enough weight into this 

Jamesburg Earth Station Pictures:
Picture taken 2006

Pictures from Late 60s, during construction:
Concrete Trucks, Foundation Pour
Antenna Lift


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