Honolulu star-bulletin. [volume] (Honolulu [Oahu, Hawaii]) 1912-2010, 1915-12-22

concrete in that they specify that the
surface OF the concrete after being sci
: shall be coated with one-third of gal
Ion per yard of liquid coal tar, par.
tfcularly named by the company pro-
noting the work by some special
trademark but all coming under the
general term, coal TAR or asphalt. "
4 In the case of so-called Dollarway
pavement, the material Is the cheap
est coal tar material on the market,
namely, mixture of water-gas tar and
common tar. After the application Of
this one-third of gallon (which is
simply paint coat and is less than
is used where brick pavement is grout-
ed with pitch, and which, as you know,
does not add any thickness to TIE
pavementl, a layer Of sand IS strewn
over the tar, which sand sticks into
the liquid and makes coating one
sixteenth to one-eight Of an inch thick.
For the promoters Of these pave.
ments to argue that this thin applica-
tion can protect the concrete from
wear Is absurd, and IL was proved by
failures to be false. The tar If hard
enough to keep from sticking to the
feet of pedestrians, would be brittle
and chip and break of and make the
street have a very unsatisfactory APP
pearance, similar to the appearance OF
dog with the mango The scheme
of coating is only put out to give a
new life to an unpopular material un-
der the claim that It 10 suitable for
roadway. 1t is not suitable and has
10 80 he lod Tho
moters believe that the only way to
get a new trial is to call concrete
something else, hence the birth of
Dollarway and other coated concretes,
and hence the interest of the cement
companies in its Introduction.
I'VE all know that brick is durable
pavement and that it has been used
for over 20 years and Is giving salts |
faction. we also know that the sBrick |
must be properly vitrifled. Would |
anyone believe, or would We dare to |
argue, that we could make a durable |
road by the use of second grade or |
poorly vitrified brick provided these |
bricks are coated with tar, which sur
face application only has thickness |
OF piece OF cardboard? No one would
agree that second-grade brick is
changed into q durable road by sim
ply adding thin application Of tar.
We have all along advocated the
grouting OF pitch with brick, but we
know that this pitch wears or scales
of in q short time, and that the only
use In its application is that part
which goes down between the brick.
The application Of this liquid coat to
concrete has no different effect than
on the brick. In fact, the liquid will |
not stick so well to concrete as to
brick, owing to the fact that hydraulic
concrete is always moist, which inter.
feres with the adhesiyeness of the
tar.
"Dollarway and all other so-called
concretes are not then payements but
is coal tar smeared over the concrete
to a depth of lie to 1-32 of an inch
with sand rolled into the surface.
Owing to the thickness of the coating,
it wears off quickly under traffic and |
has to be replaced practically every
year. In the meantime it has an I'M
satisfactory appearance. The cost OF
this yearly application will approxi-
mate 10 cents per square yard per l.
annum.
TT is well-known fact that coal
tar becomes soft and sticky at 20 de-
grees F. Imagine its condition at go
and 100 degrees F, temperature
which is not uncommon in the Middle
West. Note particularly what tax
payers of Ann Arbor. Mich, say as
to the damage OF carpets from Pc
destrians tracking the tar into their
houses, also damage done to vehicles
due to the material being picked up
by the wheels and sticking to the
woodwork What cost of maintenance
is added per annum to the first cost?
In five years the cost of concrete coat
ed with it or any other bituminous
applied in the same manner
exceeds the cost of well-constructed
brick pavement under the latest ap-
proved specifications.
''City officials and taxpayers should
be posted as to the untried qualities
claimed by the promoters of these con.
crete pavements and refuse to expert
ment, and insist on the best by spect
flying brick.
BRICKMAKERS' PROTECTIVE
ASSOCIATION"