The daily star-mirror. (Moscow, Idaho) 1911-1939, 1912-11-26

inch coating on the concrete, the com
position of this coating varying yer,
slightly as between the Bitulithic an,
the Asphaltic, but considerably be
, tween these two and Bitu-Mass. Ii
the two former kinds, Bitulithic ant
Asphaltic, two-inch coating is pro
vided of mixture of broken stone
gravel, sand and stone dust, bound to-
gether by from to 10 per cent of as
phaltic mixture in the Asphaltic Con.
crete, and by an unknown amount Of
the same in the Bitulithic. This coat
ing is not claimed to be waterproof
but the specifications in each provide
for finishing coat of pure asphaltiC
cement, the waterproofing coat, in
which sand or broken stone is sprin-
killed. while the mixture is warm, that
the surface may not be slippery. In
J maintaining each of these pavements
this waterproofing coat should be re-
newed when worn through or broken,
in order to keep the paving water
tight In the Bitu-Mass paving the
specifications do not provide for any
| waterproofing coat to be added on
top. In the opinion of this committee
the absence of a waterproofing coat
on top will allow the two inches of sur
face covering in this pavement to alb
sorb water and dry out under our
weather conditions, and it would dis
integrate rapidly under the action Of
frost. We would recommend that it
be disregarded from consideration on
this account.
Third-Hassamite on five-inch base,
Dollarway on five-inch base, and Btu
men on concrete. The specifications in
these three pavements are practically
Identical, and provide for applying a
coating of asphaltic cement on the top
Of the concrete, and covering this with
fine gravel or broken stone, the whole
to be three-eighths of an inch thick
when finished The only difference in
coating cement This cement furnishes
a waterproofing covering for the con-
crete. AS the bids on Dollarway pave
ment are lower than those on the
Hassamite or Bitumen, these two lat
ter are naturally eliminated from our
consideration
70 mol
Grafton four pavements: The Asphalt, !
under the first class named, the Btu
lithic and Asphaltic Concrete under the
second class named, and the Dollar
way under the third class.
The asphalt pavement we consider
the best pavement on which bids were
received, and the cheapest pavement
for us to lay were it entirely suited
to our conditions. 1t has smooth
surface, however, and is considered
slippery pavement This fault would
De greatly emphasized during our
winter months, owing to the smooth,
slippery nature of the mud in our
Wheeled onto the pavement more or
ess under the best of care, and this
me fault, not of the pavement itself, {
tut of the conditions under which we ,
re to use it, would make it an unde- {
irable pavement for us to buy, and +
We therefore recommend that it be ,
isregarded.
AS between the Bitulithic and the
Asphaltic Concrete your committee
an see very little difference as
avement, one seeming as desirable as
he other. AS there is difference in 2
he bid between these two pavements r
f .252 cents per square yard, or SAL d
O3.57 in the aggregate, without there \
eing anything like that difference, 4
there is any, in the quality of the q
aving, we would recommend that a
lie Bitulithic be not considered.
AS between the two remaining pave +.
tents, the Dollarway and the As
baltic Concrete, both very good pave &
ents, and on which the greatest num- 8
sr of bids were submitted, the quest
on is very hard to decide. Either 81
ould be good pavement for us to q.
ly, and the price seems right. We
ink either would give satisfaction, to
i'd be money wisely invested. The
lestion of first cost figures very 81
rgely in the final decision. The low 81
It bid on Dollarway pavement is
22,269.72. The lowest on Asphaltic
is 1852, 426.01. The differ IL
oe is $40,156.29. The interest on
is difference at six per cent per an tie