Evening bulletin., 1911-06-09
CONCRETE CONSTRUCTION.
PROPORTIONS AND MIXING OF
REINFORCED CONCRETE FOR

4
REINFORCED CONCRETE FOR
BUILDINGS.
Section 80. Concrete for slabs
walls, beams and girders shall not
he of a leaner mix than one part ce-
ment, two and one-haf parts sand
and five parts stone. Concrete for
footings, foundations, sidewalks, etc,
shall not be of leaner mix than one
part of cement, three parts sand and
six parts of stone.
PERMITS AND DRAWINGS.
Section 36. Complete drawings,
specifications and details Of all rein
forced concrete construction, show
ing the size and position of all re-
inforcinE members, shall be filed with
the Building Inspector before a per-
NIT to erect the same shall be issued.
Computations and strain sheets shall
be submitted, when required.
CEMENT, SAND AND INERTs.
Section 81. (a) Cement. Only
Portland cement shall be used which
conforms to the Standard Specifica-
tions Of the American Society for
Testing Materials.
All cement shall be tested In lots
of not more than one UD car load,
and the Building Inspector may at
any time demand that certified copies
of all test records be submitted to
him for examination.
The minimum requirements for
tensile strength for briluettes one
U) inch square in section, shall be-:
Neat Cement
days Zone day in air, six In
waterD ............,..... .oVu lob
2s days tone day In air,
twenty-seven in water) 500 lbs.
One part cement, three parts
standard sand
Z days tone day in air, six In
water) ................... ...lio lDs'
2S days Zone day in air,
twenty-seven in water) $50 lbs.
(b) Sand. Sand used for concrete
shall be clean and free from refuse,
and shall contain not less than one
half its volume of crushed lava rock
sand.
Cc) Aggregate. The aggregate
shall consist of broken stone free
from dust, or clean gravel.
The Building Inspector may demand
that any material in question be test
ed at the expense of the owner, II
an approved testing laboratory. an'
the results submitted to him to aid In
forming his opinion as to the htnes'
or unfitness of the material for tn
| purpose intended.
MATERIALS PROHIBITED.
Section 3s. The following inert'
shall be excluded in lloor slab con
structIon: Lime stone, boiler cinders
plaster OF paris. sulphate of lime. and
all similar unsuitable materials.
CEMENT BRICK.
Section 80. Brick made OF SAND
and Portland cement of the same di'
mensions as common brick. may be
substituted for common brick II the
use of such brick will in no way en-
danger the stability or safety OF the
wall according to It's exposure.
ARTIFICIAL STONE.
Section 40. Artificial stone made
OF Portland cement and incombusti'
bic and Are and waterproof material
may be used as a substitute for any
natural stone. but no artificial stone
containing more than twelve 12) pei
cent of lime or crushed lime stone
as an ingredient shall be used In
Intel, or bearing part In any buiid'
ing over three (3) stories high.
BUILDING BLOCKS.
Section Al. Cement or concrete
building blocks with hollow spaces
not exceeding one-third u-9 the
area OF the block and having an an
nulus of uniform thickness, and moi
exceeding nine (9) inches high MOI
less than eight tS) inches on tho
beds may be substituted for brick In
all buildings of the second class In
which the thickness and heights o.
walls (as given in Table of thickness
Of walls hereinbelow), up to four (D
stories, are prescribed, provided. tha
an eight (S) inch block shall be deem
cd the equivalent OF one D brick II
thickness of measure.
MEASURE OF THICKNESS.
Section AZ. The required thickness
OF all concrete walls or hreproofni
or floor construction is for the ful
| thickness OF the material only, ex
elusive of the plasterlng or floor bal
lasting
THICKNESS OF WALLS.
Section 43. Concrete walls withou
reinforcement shall be OF the fui
thickness given in table for masonr!
Il