Analysis of steel..

Investigations of columns and floor slabs..

The effect of electrolysis and sea water on cement mortars and concretes

Progress of the work..

Preliminary work..

Present work

Future work..

N P R R R R R R R♫

ILLUSTRATIONS.

PLATE I. General view of buildings occupied by structural-materials testing laboratories

II. Interior views of constituent-materials laboratory..

III. A, 40,000-pound hydraulic hand-power compression machine; B,
Accelerated test apparatus for soundness tests of cement; C, Attach-
ment for testing short transverse test pieces on Olsen long-lever
cement-testing machine

IV. A, Method of handling void apparatus; B, Hopper for filling void
apparatus

V. A, Apparatus for determining percentage of voids; B, Apparatus and
connections for making void test on "one-size" material

VI. A, Apparatus and connections for determining specific gravity of sand
and screenings; B, Apparatus for removing silt from stone screen-
ings; C, Apparatus and connections for determining specific gravity
of large material

VII. A, Bumping screen for making granulometric analysis; B, Method
of filling one screen with material retained on another.
VIII. A, Implements used in making density tests of mortars; B, Cast-iron
cube and cylinder molds; C, Spherical bearing blocks for com-
pression tests...

IX. A, Typical failure of concrete cylinder; B, Failure of concrete cyl-
inder-rupture through aggregate; C, Compressometers for meas-
uring deformations of cylinders; D, Typical cones formed by
rupture of concrete cylinders.

X. A, 200,000-pound compression machine; B, Concrete mixer, charg-
ing end, 1 cubic yard capacity

48

XI. A, Apparatus for finishing top of bond-test specimens; B, Beam
selected at random to show accuracy of rod spacing; C, Gang saw
for cutting cubes from blocks of stone.

XII. Room for molding beams...

XIII. Interior view of moist room for storage of test pieces.
XIV. Interior view of testing room, beam section..

XV. A, Plain-concrete beam in testing machine with deformeters in
place and stirrups for supporting beam at third points; B, Re-
inforced-concrete beam in testing machine ready for application
of load

XVI. A, Attachment and micrometer for measuring slip of rods; B, Steel carriage for handling beams

XVII. Method of recording character of reinforced-concrete beam failures..
XVIII. A, Henning steel extensometer for measuring elongation of steel;
B, Method of making bond test....

XIX. A, Shear specimen in machine ready for test; B, Interior view of storage room, building-block section...

66

V

PLATE XX. Interior view of the mixing and molding and the testing rooms,
building-block section....

XXI. A, Building block in machine ready for transverse test; B, One-
half of building block in machine ready for compression test...
XXII. Sectional plan of fire-test furnace, Underwriters' Laboratories,
Chicago, Ill...

XXIII. Heating chamber, Underwriters' Laboratories, Chicago, Ill.....
XXIV. A, Fire door filled with building blocks ready for test; B, Appli-
cation of water jet to test panel after fire treatment..
XXV. A, Permeability apparatus; B, View showing permeability tests
and method of supporting test pieces..

FIG. 1. General plan of buildings..

2. Diagrams showing details of reenforcement of beams..

3. Diagrams illustrating method for computation of concrete beams.
4. Diagram illustrating bending moment between gage points.
5. Specimen for concrete tension tests..

6. Apparatus for concrete tension tests.

7. Elevation of fire-test furnace, Underwriters' Laboratories, Chicago, Ill..
8. Cross section of apparatus for holding permeability test pieces...
9. Diagram of permeability apparatus and connections..

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