Yg2 EXPEEIMENT STATION KECOED. 



There have been constructed 21.74 miles, aggregating 246,150 sq. yds., of brick 

 roads at a cost per yard of $2.37, or a cost per mile of $27,297. A 5-in. concrete 

 base of 1 : 3 : 6 was used and a concrete curb was poured at the same time as 

 the base. The brick surface was laid on a li-in. sand cushion and rolled by a 

 2i to 31 ton roller. Expansion joints were placed along the curb line and every 

 100 ft. transversely. 



In tests of brick for the modulus of rupture, in which the brick were broken 

 between supports 6 and 7 in. apart, the average modulus in one set of tests was 

 2,512 lbs. per square inch. Tests were also made of sections of brick pavement, 

 constructed as beams, 12 in. wide of 42-in. span and loaded at the center, in 

 order to study the efficiency of differently mixed cement joints. With a 1 : 1 

 grout the plane of failure cut across one brick and for the rest of the way was 

 through the bond. In one instance a lug was sheared off. With the 1 : li grout 

 the failure in one case was across two bricks and the rest of the way through 

 the bond and in the second case was through the bond all the way. With the 

 1 : 2 grout the failure was entirely through the bond in each instance. In no 

 instance was the failure through the grout. 



The author is of the opinion that these results indicate the advantage of 

 using a 1 : 1 grout rather than a leaner mixture or paving pitches, and concludes 

 that the brick surface is dependable to distribute the load over a larger area 

 on the foundation. 



Methods and cost of constructing a mountain road system in Wise County, 

 Virginia, W. F. Cocke {Engin. and Contract., 43 {1915), No. 15, pp. 3^1-344, 

 figs. 6). — This article gives a complete history of a system of roads in a county 

 in Virginia, describes methods and cost of excavation, and gives a table of 

 solid cuttings on sidehill excavation. 



Proceedings of the first annual good roads week at Cornell University 

 {Cornell Civ. Engin., 23 {1915), No. 6-7, pp. 217-478, pi. 1, figs. J5).— These 

 proceedings include the following special articles: 



Survey and Plans for Road Work, by M. W. Nelson ; Road Drainage, by M. J. 

 Adams; Town Roads, by W. F. Wilson; Road Materials Available in New York 

 State and Their Adaptability for Different Types of Construction, by H. S. 

 Mattimore ; Highway Culverts and Bridges, by O. L. Grover ; Public Borrowing 

 for Road Building, by A. A. Young ; Gravel Roads, Road Economics, and Sand- 

 Clay Roads, by L. I. Hewes ; Surface Treatments and Bituminous Construction, 

 by H. E. Smith; The Mining and Refining of Lake Asphalts and the Physical 

 and Chemical Characteristics of Asphalts for Paving Purposes, by J. S. Miller ; 

 Asphalt Block Pavement, by G. P. Hemstreet; Cost and Economy of Cement 

 Concrete Pavements and Standard Recommended Practices for Construction of 

 Concrete Roads, by H. E. Hilts; Organization of a Highway Department, by 

 G. A. Ricker ; Masonry and Foundations, by H. S. Jacoby ; Inspection of High- 

 way Bridges, by C. L. Crandall; Manufacture and Inspection of Paving Brick 

 and Construction of Brick Pavements, by W. P. Blair ; Proper Construction of 

 Brick Pavements, by W. C. Perkins; Cost Keeping and Management, by F. A. 

 Barnes ; and Prospecting for Road Material, by H. Ries. 



V/heel tire width and weight of load for conveyances with animal draft, 

 J. DuHM {Ztsehr. Transportw. u. Strassenbau, 32 {1915), No. 1, pp. 16-19). — 

 This article discusses the conditions affecting the relations betv/een the tire 

 width, the load on the wagon, and the condition of the road surface, with par- 

 ticular reference to conditions and practice in districts of Austria. 



In the Tyrol the following relations between tire width and load are pro- 

 posed : 



