CHAPTER Il, SECTION 1B
In conjunction with the above tests, additional tests and surveys were made on coral
concretes in regard to: (1) effect of temperature on curing rate; (2) effect of use of salt
water in mixes: (3) use of admixtures; (4) methods of processing, including membranes; (5)
study of variations of water content; (6) study
of shear patterns.
Placement of concrete was required cn 25
different isiand sites in the two atolls. Seven
stockpiles and seven central concrete batch pla. *s
were established. Figure 2-23 shews the start uc
a typical stockpile. The fine aggregate pile . in
the right foreground; the coarse aggregate is in
the background.
With the placement cf concrete, compressive strength cylinders were made and shipped
to the laboratory at Elmer. A total of 800
cvlingers were tested for quality. This amounted
to one control cvlinder tested for every 32 cubic
yards of concrete poured during the Operation.
A breakdown of the results obtained from tes.ing these 200 quality-control cylinders from all
classes of conerete is tabulated as follows:
Class of Concrete
Averages at 28 days
Eniwetok
Bikin:
2000
2590
3609
3300
24593
2808
3943
3690
psi
psi
psi
pst
sites
required
required
required
required
sites
psi
psi
psi
pai
2546
34563
3612
3866
psi
psi
psi
psi
The laborator, provided a variety of testing services other than mix design and quality
control on concrete and concrete aggregates, An
Figure 2-22.
extensive senes of soil plate bearing tests were
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Crusher Plant at Site Charlie
Page 2-48
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