The Caucasian., 1903-06-07

" hen laid as herelnbef0re specified
lie asphalt pavement will bc regarded
as completed.
:. All material and work in cnnncc-
| ti"m with the foundation and prepara-
tI"n and laying Of asphalt pavement
l:ervinbrfpre specified will be subject %
inspection, direction and approval of the
tiry 'unCil or its duly authorized agent
1t any tmc or place where any part ~
the work may he in progress.
SPECIFICATIONS FOR UVAlnE
\nTUKAL ROCK ASPHALT!
5t.-Fuundatlon Ihc earth found2-
Son or Sub grade will be brought to
on even surface. parallel with the grade
trupUstd fol the pavement, by making
lie necessary excavation or en1bank-
mcnt. and the excess dirt OF any Other
material Tor any other materials, rock.
gravel ur lumbcrl from excavation
shall belong to the city and be delivered
II any "0Int within 1000 feet ftOm linn
its IF contract as may be designated By
the engineer and Improvement commit
tee
soft or spongy earth. or other mate
rial not affordlng firm foundation. will
he removed. and the space filled with
sound stone or other material broken as
specified for concrete, which shall be
SOlIIitied By ranl11ling or rolling as hcsc-
matter provided
he sub grade surface wifi be com
pacted by rolling with collier operated
by steam power which. will give a
weight pressure Of not less than 200
hounds per lineaf inch Of roller Any
portion not accessible 20 the solle. shall
be thoroughly Compacted by samfning.
When the rolling and rammng shall be
done the surface shall be true and
smooth and Qs-2 inches below the pro-
posed finished surface of the pavement. |
57.-Upon the foundation as above
will be laid a bed of cement
six inches in thickness to be |
composed by measure as follows:
If Portland cement is used one part |
cement, four parts sharp sand, reason
ably clear from loan, dirt and other for
eign matter. said reasonable clearness.
etc, to be determined by the city en-
glneer and Improvement committee. and
eight parts clear broken dust cleaned
stone or clear washed gravel or clear
iust screened Stag.
If Hydraulic cement is used one part
two parts sharp sand reason
ably clear from loan1, dirt and other for
9ign matter. said reasonable c1earness,
stC.. to be determined by the city en-
yineer and Improvement committee, and
i've parts clean broken dust screened
tone or clean washed gravel Or clean
lust screened Stag.
The cement and sand tose thoroughly
mixed together dry, to which only a stiff
lCient amount of water will be added to
'roduce mortar of proper consistence
When thoroughly mixed. In to this fresh
Mortar the stone or gravel or Stag. wet. ,
'ut containing no water in the heap. :
Will be mixed. Each batch of concrete +
will be thoroughly mixed, the mixing to I
e continued on the board until each {
iece Of stone, gravel OF Stag is COM
letely coated with mortar: it will then
e spread and at once thoroughly COM I
acted by ramrning until free mortar ap- t
ears upon the surface. The whole ope- /
alton of mixing and laying each batch +
ill be performed as expeditiously as +
ossible with the use of sufficient num- /
et of skilled men, I
SIZE OF STONE. il
5S-The fragments of crushed or t
roken stone, gravel or Stag shall meas 5
re not more than 2 I-2 inches on their t
INCEST dianeters. The upper surface Il
the concrete will be made smooth and b
Sactly parallel with the surface of the b
avement to be laid, and will be pro- c
cted from the action of the sun and W
ind until set. b
5o.-The cement for the concrete must 81
! of standard grade of Portland or Hy- II
-au,c cement, newly manufactured n
he cement while in storage or upon e;
e work, or while being hauled to the p'
ork. shall be properly protected and "
}. cement shall be used which in the
Union Of the city engineer has been N
'tllaged by age or exposure St
Cement used must stand following r
sts N
Fineness-Sieve No. 100 Of 10000 &C
eshes per square inch of No. DO Stubbs al
Ire gauge: Portland o2 per cent fine o' ..
vdranlic 80 per cent fine. ;.
Specific gravity-Sample well dried es
'rtland $40 70 3.25: Hydraulic 2oo ar
Soundness-Pats of neat cement 4 Or
ches in diameter one-haIf at center ar
tn thin edges: Portland : hours boil til
7 test; Hydraulic must not crack or m
come contorted along edges in two CO
VS.. co
lime of set--Portand initial set d. ha
nutes, final set 10 hours; Hydraulic tn
tial set As minutes, final set 10 hours. TIL
Tensile strengtfl-Neat briuuettes. st'
ain applied Uniform rate to 400 ne
unds per minute: Portland day 1ss M
unds, 7 days 45o pounds: Hydraulic nl' D,
lay Is pounds, 7 days I25 pounds. I'M
jo.-Said rock shall contain Il to ii a. a.,
cent of natural bitumen, 80 to SO 81,
cent Of pure bicarbonate Of lime, ,,,e
| must be free from qttartz, suphates. W., Ms
n pyrates or aluminium. The rock is ~, ~
It crushed and reduced to a powder. =.
er which it must be heated in a re- ha;
wing, cylinder from 40 to 800 degrees ~ ~
depending on the time of on, ~
IF and distance to be hauled. Moth
whatever shall be added to or taken a,..
m the powder obtained by grinding ,hl Ll
bituninous rock No binder will be tae t,'e
uired if this material is used, but '"e