The Washington herald., 1912-03-20

Il
ing in which all the brick work and in
terror plasterinS was done with Alca
(s3) This picture shows the Bellevue
Apartments, In Philadelphia, in which all
the interior plastering work was done
with Alca lime.
From the pictures shown you II is evil
dent that we are justified in claiming
that in Alca lime We have a material
which is available for all requirements
| of ordinary building construction. and
that II is the only material which will
foundation and other masonry or brick
walls of building, plastering the In
terror, and stuccoing, II desired. the ex-
prove conclusively that Alca lime is
meeting with general approval from the
architect, mason, bricklayer, and plas-
terer.
pictures do not show 1.-THE of the work
that has been done with Alca lime, and
that we are making our claims, not on
the basis Of Of a few hundred tons Of this
and use OF thousands of tons; the yard
age covered by Alca lime sold by the
Charles Warner Company In 1911 exceed
ing 10000
Development of Research.
Alca lines and cements are the develop
ment OF research work undertaken by the
speaker and his associates for the pur-
pose Of producing cementitious and plas-
tic materials free from the various OBJ
jectionable features more or less charac-
teristic Of all cementitious materials then
in general use. This research, which
started over ten years ago. is still going
on in the effort to still further improve
these products.
shall not discuss the technical side
OF the chemical and physical problems
involved. as they have been dealt with
to some extent in papers read by me be-
fore the Franklin Institute in February,
lyOs, and before the Society of Testing
Materials in June, 1910, and are still in
volved in pending ana contemplated ap-
plications for patent protection here and
been placed commercially on the mar
ket, although several thousand barrels
have been manufactured and used in
work which is being carefully observed
in order to demonstrate by and question
that the behavior of the material in
actual construction will confirm the re-
suits of the laboratory tests 1t Is,
however. probable that cements OF this
class will be offered to the building trade
n the near future.
Briefly, our work shows that the addi-
tion Of calcium illuminate TO mixtures OF
puzzolanic material and lime, or to ma
tural cements, causes these materials TO
harden more quickly and develop strength
at early periods, approaching Portland
greater Elasticity. are more impermeable.
show less change of volume during set
ting, are more adhesive, and through
their low lime content offer greater re-
sistance to the destructive action OF the
elemente than do Portland cements. They
also seem to be less affected by eXpan-
sion and contraction, due either TO varia-
tion in the moisture contained. or TO tenn
perature. and even when tested in ten
sion show gain in strength over long
Periods 1.-THE curve being a continually
rising one) instead Of showing the drop
characteristics OF Portland cements. Alca
lines partake OF all these qualities: their
base Is lime that has been perfectly
slaked OF hydrated and further prepared
by mechanical means under the careful
supervision of trained experts and chem
lists in contrast with lime produced under
the rough and ready methods of the
mortar box To this Is added "Alca." the
trade name foF commercial calcium alumni
nate, in Quantities varying from 10 to Is
per cent. This corresponds in its action
TO an intensely active puzZolan, the alum.
mates and any silicates present either
combining with the lime or forming hy-
drogels. There are no elements or COM
ent to a more or less extent in all ce-
mentitious materials from their first use,
the difference being that they are, owing
to the ratio Of the elements to each 9TH
er. and the effect Of their special prepa-
ration, made more active, being in such
form that reactions that ordinarily re-
quire months for their completion are
by the energizing action of Alca, brought
about in much shorter time. Some Of the
practical advantages OF Alca lines that
have led so rapidly to their general use
are as follows:
They will carry more sand. and yet