 

 

102
706

A MEASURE OF THE BOND
BETWEEN ASPHALTAND CONCRETE '

T116853 for the Degree of B. S.

Bruce B Bolton '
1928 T

 

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A Ieasure of tne 30nd Between

Asphalt and Concrete

A Thesis Sn mitted to

The Faculty of

Hichigan State College
of

Agriculture and Applied Science

333’

Bruce B. ﬁglton

For Degree of

Batchelor of Science

June 1928

THE—Sis

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The intention of the autlor was to measure the
adhesive qualities of asphalt on concrete. is many differ-
ent conditions as possible were used in the tests gerformed
and graphic results were attainable. Concrete of differ-
ent strengths was eXperimented with, comparison of Portland
cement concrete with Lumnite cenent concrete was made dif-
ferent kinds of asphalt being used. In addition, the
asyhalt Was apolied at Varying temgeratures, tests were
made at varying temgeratures and concrete both dry and
moist was eXperimented upon.

The method of making the tests was similar to that of
finding the tensile strength of Concrete. Briquettes of
concrete were molded first placing an insert at the exact
center of the mold. This insert was of cardboard one-
sixteenth of an inch thick and divided the concrete bri-
quette into two equal sections each having a square face
one square inch in cross section. When the concrete had
taken an initial set the insert was removed. After the
concrete had hardened and seasoned, the soace between the
half-briquettes was filled with asghalt. By pulling the
half-briguettes agart and measuring the amount of pull, the
bond in pounds per square inch was found.

The apgaratus for measuring the bond consisted of a
lever arm hinged at one end and sugported at the other by
a platform scale. The test piece was suSpended at the
quarter point from the hinged end and a gull exerter upon

it. Hultiplying the scale reading by four gave the amount

94034

of pull in pounds per square inch. To make the results
have a standard basis the stress was uniformly increased at
the rate of twenty pounds per square inch per second.

The results of these eXQeriments can be arranged in
different orders and groups, to give comparison from severa
viewpoints. These arrangements are shown graphiCally in fol-
lowing page S 0

Comparing first, the bond of asphalt on varying
strengths of concrete, the bond was found to vary on some
curve, with the streigtn of concrete for all of the differ-
ent asphalts used. This result applies to Portland and Lum-
nite cement concrete alike. From a consideration of tem-
perature of applic tion the bond increases with the appli-
cation temperature, on some curve, for all aSphalts at all
temperatures of testing, on all concretes, with one ex-
ception. In the case of Blovn asphalt on four-thousand
pound Lumnite cement concrete, the bond was lowest at mid-
ranre of application temperature and highest at the low-
est temperature of application, with an exception. Ihen the
tests were made at 55°C. the bond varied with the temper-
ature of application, on some curve.

Taking tue temperature of the test as a basis for com-
parison the bond varied indirectly, on some curve, as the
testing temperature; the bond being AiQhCSt at the lowest
temperature, for all the other conditions mentioned in the
preceeding paragraph.

‘ further comparison can be made of the asphalts used.

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Bond of Blown Asphalt

 

Portland 4000% Temperature Temperature of Application
of Test 150° 2ou° 255°
12° 70} 74; 80}
25° 55 4o 65
55° so 54 40
Portland 2060} 18° 40 6o 76
25° 28 4o 56
55° 25 52 4o
Lumnite 4000} 15° 100 62 64
25° 56 4s 61
55° 25 52 44
Lumnite 2050} 15° 99 48 so
25° 58 52 52
55° 2? 52 56

Above are some values for the bond of Blown asphalt
on different kinds of concrete at Varying temperatures,of
application of aSphalt and testing for bond. All values

are in pounds per Square inch.

Blown asphalt seeming to have in averaée and the most con-
sistent vilue, will be taken as an average. Lhe bond of
Blown asphalt on concrete vgries, on seme curve, as the ap-
plication temperature and indirectly at the testing temper-
ature. hatural asphalt has a bond Varying in the same man-
ner being higher than that of Blown asphAit at low temper-
atures and lower at high temperatures. Ihe bond of iefined
asphalt varies the same as that of Blown but differs from
the bend of Iatural asphalt in that at lower temperatures
of testing the bond is lower than that of blown asphalt.

Another consideration is that of the bond of asphalt
laid on moist or saturated concrete. In a nwioer of tests
it was found that aSphalt laid on either moist or saturated
concrete had a bond, ten to ttenty percent for Blown and
twenty to twenty-five percent for Refined and Iatural as-
phalt, hightr than bond for same aSphalt under similar con-
ditions of temperature, strength, etc, on a dry surface.
Care was taxen to thoroughly dry the test pieces after a'-
plying the asphalt as there is little or no bond while con-
crete surface is moist.

In the preceeding graphs, Blown asphalt was taken as

1

standard. In figures one and four, graphs for Satural as-
phalt were superimposed. Graphs of Blown asphalt on Lum-
nite cement concrete were also superimposed on figures two

and three.

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