INDEX ACCORDING TO TYPE OF ROAD. 
In this report the specifications have been grouped according to the types of mate- 
rials covered. The following index has been prepared for the convenience of engi- 
neers who may be particularly interested in individual types of construction. In this 
index all specifications relating to each type of pavement are grouped together. 
Semi-gravel, top soil, or sand clay: Page. 
Aggregate for road surfacing 18 
Waterbound roads: 
Gravel 16 
Broken slag 13 
Broken stone 5 
Bituminous materials for cold application: 
Road oil 22 
Tar 24 
For covering see " Chips or No stone (or slag)" under specifi- 
cations for bituminous macadam, broken stone, or broken slag. 
Bituminous materials for hot application: 
Road oil 22 
Refined tar 25 
For covering see "Chips or No stone (or slag)" under specifi- 
cations for bituminous macadam, broken stone, or broken slag. 
Bituminous macadam: 
Broken slag 14 
Broken stone 5 
Asphalt cement 23 
Refined tar 25 
Large aggregate bituminous concrete: 
Gravel aggregate 17 
Broken slag aggregate 14 
Broken stone aggregate 6 
Mineral filler 21 
Broken stone or sand, coarse and fine aggregate 7 
Asphalt cement 23 
Refined tar 25 
For covering see " Chips or No stone (or slag) " under specifica- 
tions for bituminous macadam, broken stone, or broken slag. 
TOPEKA TYPE BITUMINOUS CONCRETE: 
Broken stone or sand, coarse and fine aggregate 8 
Mineral filler 21 
Asphalt cement 23 
Sheet asphalt: 
Sand 19 
Mineral filler 21 
Asphalt cement 23 
Binder course not specifically covered by the conference (broken stone 
aggregate for large aggregate bituminous concrete could be used). 
Portland-cement concrete base: 
Portland cement 25 
Broken slag for coarse aggregate 15 
Broken stone or gravel for coarse aggregate 9 
Stone or gravel screenings for fine aggregate 10 
Sand for fine aggregate 19 
Portland cement concrete wearing surface: 
Portland cement 25 
Gravel for coarse aggregate 19 
Broken stone for coarse aggregate 9 
Combination of dustless screenings and sand for fine aggregate 11 
Sand for fine aggregate 20 
Steel reinforcing rods 28 
Portland -cement concrete (suggested clauses) 27 
Asphalt cement for use as poured joint filler 23 
Refined tar for use as poured joint filler 25 
§5 
