For sieved vershel, when filled into the measure as lightly as possible. The cement should be tested in three ways, for tensile strength, for excess of chalk and for excess of clay : in testing for tensile strength beigutt
0
of ret cement, gauged as stiff as possible
and put into water within 224 hours should
them
have a tensile strength of no less than 562 lbs to 2.25 inches of section after com days immersion . In testing for clay compound pats about 3" in diameter should be made of neat cement and kept dry: if the pat cracks and shows a yellowish colour, clay is in excess : if similar test pats, kept in water, crack and swell, chalk exists in the
cement in excess._
The meto
b = Composition of the Concrete . _ "Slowish of one part cement to four
parts breeze, or other approved porous
66
material, such as iron slag, hard brick rubbish, will bush clay.
bench clay, broken stone sto
7/4
a
Which much pass through a "/" mesh. Such materials will generally contain a sufficient proportion of fine stuff but should the latter be less than 1/5 of the whole more should be added; being a smittschach may be used for the purpose but in no case should they
fine stuff exceed 5/8 of the whole.
3
The luzeze to be obtained from far
works on other available source and
to be
perfectly clean and free from mudlakes | live. The aggregate to be clean and free from dust and whatever materials are complained
must be free from loamy or clayey particles
they
and much if necessary be washed clean. The inpedaration the Imined
2. The
first twice turned
over
in
by being
Phidey state, then