Pullman herald. [volume] (Pullman, W.T. [Wash.]) 1888-1989, 1921-08-19
SPECIFICATIONS
FOR
CONCRETE SIDEWALKS
-. :, Pullman, Washington

mems for Portland Cement OF the
ficallonon Society for Testing Mater
American
ials
AGGREGATES;
G--a sore delivery on the job, the
potor shall submit to the En-
COME fifty 900 pound sample of
slns ~ the aggregates proposed for
each Tbese samples shall be tested
use 70 found to pass the require
anu : Of the specifications, similar
Material shall be CONSIDERED as ac-
centable for the work: IN no case
shall aggregates containing lrost or
s sn" Of frozen material be used.
70, FINE AGGREGATE: Fine ag-
Y. shall consist of natural sand
screenings from hard, tough
Nod rock or gravel consisting of
ILL., Grains or other hard mater
We clean and free from any surface
SIr, or coating and graded from fine
ooorse. with the coarse particles
urodominating. Fine aggregate,
phen dry. shall pass a screen having
so,r (4) meshes to the linear inch;
not more than twenty-five (25) per
nant shall pass sieve having fifty
Isnl meshes per linear inch, and not
Moro than five CD per cent shall
macs sieve having one hundred
T00) meshes per linear inch Fine
agoregate shall not contain injurious
yeoetable or other organic matter,
&c determined by the colorimetric
test* nor more than five CD per
cont by volume, of clay or loan
Field tests may be made by the en-
"a Ha1i
Of any time during progress of the
work. If there is more than five
(5) per cent of clay or loan, by vol
nme. in one CD hours settlement af-
fer shaking in one hundred (100)
ner cent excess of water, the mater
ial represented by the sample shall
be rejected.
Fine aggregate shall be of such
quality that mortar composed of one
m part Portland cement and three
(3) parts fine aggregate, by weight,
when made into briquets or cylin-
ders shall show a tensile or com
pressive strength, at seven CD and
twenty-eight (2S) days, at least
equal to the strength of briquets or
cylinders composed of one % part
Of the same cement and three go
parts Standard ottawa sand by
weight The percentage of water
used in making the test specimens of
cement and fine aggregate shall be
such as to produce a mortar of the
same consistency as that of the Otta-
wa sand test specimens of standard
consistency. In other respects all
briQuets or cylinders shall be made
in accordance with the methods of
testing cement recommended by the
American Society for Testing Mater
ials (See Cement Specifications A.
S. T. NJ
(b) GOA r Sc AGGREGATE
Coarse aggregate shall consist OF
clean, durable, crushed rock Oh
gravel graded in size, free from
vegetable or other organic matter
and shall contain no soft, flat OF
elongated particles. The size of the
coarse aggregate shall range from
two and one-half q Y } inches down
not more than five (5) per cent pass
ing a screen having four (4D
meshes per linear inch, and no inter
mediate sizes shall be removed.
3.--WATER:
Water shall be clean, free from
oil acid, alkali, vegetable or other
organic matter.
Joint FILLERS:
The joint filler shall be a suitable
elastic water proof compound thai
VIII not become soft and run out il
not weather, nor hard and brittle
and chip out in cold weather, or pre-
pared strips of fibre matriX and bi
tumen as approved by the engineer
The strips shall be one-half { Y
men IN thickness, their width shall
al least equal the full thickness o.
the slab and their length shall al
least equal the width of the slab a
the Joint. The expansion Joints may
be filled with dry sand if desired. Sc
long as one-half (R) inch openinl
between ends of slabs is maintained
Subgrade
5.-PREPARATION:
All soft and spongy places shall bt
removed and all depressions filled
with suitable material which shall
De thoroughly compacted in layers
not exceeding six CO inches in thick
ness. The subgrade shall be thor
ohiJ taHlptu Until II is Drought IL
ilrm, unyielding surface. 1t shall
nave slope toward the street curl
ol not less than one-quarter { a
inch per foot
S,--DEEP FILLS:
All fills shall be made in a name
satisfactory to the engineer. Thu
use OF muck, quicksand, soft clay
spongy or pershable material is pro
moited. The top of all fills shall
eAtehd beyond the walk on each sid,
q. ieast one CD foot. and the side
snail nave slope not greater thar
ene on one and one-half 1h }
DRAINAGE:
When required, a suitable drain
@se system shall be installed AM
SSohnected with sewers or othe
orai4s indicated by the engineer
&-DEPTH:
me subgrade shall not be les
; tIan Tour (4) inches below the fin
iSled surface of the walk. Fo
IIee1EeWays this shall be six inche
w. below finished surface of walk