528
certainly correct and I venture,
to think that those antecedent to
a clue to the causes of
it afford
this difference -
The appearance and
11.
behaviour
of the briquettes after fracture, and the absurdly low results obtained are exactly what always happens when Portland cement has been "killed" by the
admixture of too much water.
This cement has been improperly gauged, its strength has been deteriorated by mixing it with
too much water.
and
the
manipulation of the briquettes after gauging has not been in accordance with usual practice, and the terms of your Specification. The Resident Engineer has made
his
his cement into mud, and has
consequently obtained the results, and appearances to be expected, from mud-
12. I enclose copies of my
Reports 7 days test reports for this Contract- also
special record of tests upon
Next Report bimonths. A
briquettes six months old-
a comparison of these tests with those made by the Resident Engineer will be of interest - (see paragraph 7 ante)
(a) “average of 30 tests = 483 lbs" in Hong Kong-
This
compares with
with}.
Test Reports 1,2,3,4.
886
= 852 803 871
in England
(b) & (c) “February 18 average 363 lbs" "later importations average 320 lbs after
"one month's make"
This compares with Test Reports 5,6.
789
= 961,6
in England
=
(d) & (e) "Glenogle" 21 tests average = 380 lbs
"Chang Wo" 12
365" These compare with Test Reports No7
No7
862 lbs in England.
13.
'ru