DUST PREVENTION AND ROAD PRESERVATION, 1915. 71 



The unsatisfactory condition of the road is ascribed to lack of care 

 of the road during and after the very heavy rains of the past summer. 

 The roadway can be saved by the addition of suitable new material 

 and by reshaping the surface. 



EXPERIMENT AT FORD, KANS. 



This road was inspected December 20, 1915. In the first 100 feet 

 south of the bridge over the Arkansas River the road has become 

 flat. One depression has formed at the end of the bridge and at two 

 other places on the filled approach to the bridge the sand-clay surface 

 has been cut through. 



The remainder of the section has been shaped with a road grader, 

 but too much sand was brought upon the surface from the ditches 

 during this process. In consequence the surface has become weak- 

 ened and two deep ruts have formed under trafl&c. 



The depressions should be filled and a thin dressing of new material 

 apphed to the entire surface to take up the excess of sand. 



SUPPLEMENTARY REPORT OF EXPERIMENTS MADE AT BOWLING GREEN, 



KY., 1907. 



KENTUCKY ROCK ASPHALT. 



The original report of this experiment was pubHshed in Circular 

 No. 89, and reports of annual inspections are given in Circulars Nos. 

 90, 92, 94, 98, and 99, and in U. S. Department of Agriculture Bulle- 

 tins Nos. 105 and 257. The inspection on which this report is based 

 was made December 13, 1915. 



This work has not been repaired or cared for in any respect since 

 its construction. Debris carried or dropped upon it has been swept 

 by rain and traffic into ridges on each side, which interrupt lateral 

 drainage and hold dirt on the surface. Consequently the deteriora- 

 tion has not resulted from traffic only. The failm-e is most marked 

 in the western one-third, where the surface is fuU of holes varying 

 from 4 square feet to 12 square feet in area. In the middle one-third 

 of the pavement length there is one large broken area at the south edge 

 which is 4 feet wide by 10 feet long. The eastern one-third of the 

 section is stOl practically intact. Here the most noticeable defect is 

 a shallow unbroken rut on the south side made by a heavy concen- 

 trated load during construction and not entirely ehminated by subse- 

 quent roUing. Where the surface is broken the asphalt has disap- 

 peared and the rocks are loose. Where the binder has not failed the 

 siurface is smooth and hard and firm. 



