24 
BULLETIN 532, U. S. DEPARTMENT OF AGRICULTURE. 
Measurements on Section II. 
OHIO POST EOAD AT MOSCOW BRIDGE. 
Section II was laid on a 0.4 per cent grade with limestone aggregate 
with joints spaced successively 20, 40, 60, 80, and 100 feet apart. 
This section, laid one month later than Section I, showed much 
the same characteristics as far as expansion and contraction are con- 
cerned. As the weather became colder and colder, the concrete showed 
more and more contraction. In the hot weather of the summer one 
year after laying the concrete showed about the same amount of 
expansion that it showed three days after la3 T ing. One of the cracks, 
however, that had opened in the preceding winter, instead of closing 
because of the expansion of the concrete, remained open, probably 
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AUGUST 1,1914 
NOVCMBER 2,1914- 
INARCH 3,1915 
JUNE 17,1915 
FEB2S.I9I6 
TEMPERATURE OF PAVEMENT 
JULY 31- 75° F. 
AUG. 1-73" 
NOV. 2 - 53° 
MAR 3 - 30° 
JUNE 17 - 78° 
Fig. 17. — Expansion and contraction of concrete, 
Ohio Post Road. Section at Moscow Bridge. 
Laid July 29-30, 1914. Section II. 
FEB 25- 
37 c 
owing to the presence of foreign material. This same crack opened 
considerably wider in the cold weather of the following winter, as 
seen in the measurements of February 25, and the remaining joints 
likewise expanded considerably. Note that a crack formed in the 
100-foot section and did not form in the 20, 40, 60, or 80-foot sections. 
Measurements on Section III. 
OHIO POST ROAD AT MOl'NT STERLING. 
Section III sIioavs much the .same characteristics as the preceding 
Sections I and II. This section was laid on November 5, and the 
initial readings were taken on November 6 at a temperature of 51° F. 
