BULLETIN 



No. 105 



Contribution from the Office of Public Roads, Logan Waller Page, Director. 

 July 10, 1914. 



(PROFESSIONAL PAPER.) 



PROGRESS REPORTS OF 



EXPERIMENTS IN DUST 

 PRESERVATION, 1913. 



EXPERIMENTS AT CHEVY CHASE, MD. 

 (Completion of 1912 project.) 



CEMENT CONCRETE, OIL-CEMENT CONCRETE, VITRIFIED BRICK, AND BITUMINOUS 

 SURFACE TREATMENTS ON CONCRETE. 



The 1912 experimental project is located upon a section of Ken- 

 sington Road (Connecticut Avenue extended), extending north from 

 Bradley Lane to the loop of the Capital Traction Co. tracks at Chevy 

 Chase Lake. This total length of 6,195 feet was covered by six 

 experimental sections, as follows: 



Experiment No. 1, bituminous concrete (Topeka specification). 



Experiment No. 2, bituminous concrete (District of Columbia spec- 

 ification) . 



Experiment No. 3, crment and oil-cement concrete surface treated 

 with bituminous materials. 



Experiment No. 4, oil-cement concrete. 



Experiment No. 5, cement concrete. 



Experiment No. 6, vitrified brick. 



The work was begun September 9, 1912, and was continued until 

 December 13, 1912, when, owing to unfavorable weather conditions, 

 it was discontinued, after 4,561 feet had been partially completed. 

 A complete report of the work accomplished in 1912, with approxi- 

 mate cost data, was published in Office of Public Roads Circular 

 No. 99. . The following report covers the completion of the project 

 with such repetition as may appear necessary to a better under- 

 standing of the methods pursued. 



Note. — This bulletin gives the details of construction of several sample roads constructed under the 

 supervision of the Office of Public Roads. It is of interest to all sections where improvement of roads 

 is contemplated or necessary. 



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