is it Intended to be a mrrative of the constructionoperation.
Chronology can be t~ced f~m the progress charts which are a PSrt of
this report, and Mrrative is sacrificedb
pertinent cofmnentson typO
construction.
The bases of all the reinforced concrete buildings were poured
using a mix df
6 bags
local sand, and ~
of high early strength cements 1.4cubic feet Of
cubic feet of coarse coral rock fmm the Engebi
crushing and screeningplant. Because of the poorly graded aggregates
the resultant concrete had a ce~nt content of 7 bags per cubic yard.
Concrete was handled by crane from mixer to forms using locally
constructedbottom dump buckets as the buckets shipped out were too
large and heavy for the cranes available. There were only two difficulties encountered in this phase of the work. It was necessary to
resort”to rether elaborate spread footing supports consisting of a
metal plate and a concrete block to hld the reinforcing steel up off
the sand. There were insufficiat vibrators avdlable and the two in
use tith broke down on the base of Gamma A.
wa8 th
The nmt
unusual feature
use of 0.05% of sugar to cenmnt content by weight in the con-
crete for the base of Game C. The delay in setting time caused by
the added sugar permitted the concrete for this base to be mixed on
Biijiri end transportedacross the I.a@on by DUKW to Rojoa. This same
technique was used for all concrete, including the special concrete,
poured on Rojoe.
Early in this period work was started on the placing of the Bureau
of Yarda and Docks reinforced concrete cubes. The original plan called
25
Section XVI