FORMS FOE SPECIFICATIONS, ETC., FOR ROAD MATERIALS. 



Per cent. 

 Passing (!^ e i^r?. e ll?^?A e i e °. t . e . d .L.inch screen 100 



Passing (the largest size selected) inch screen 



and retained on (the second largest size se- 



A^t^Linch screen to . 



Passing (the second largest size selected) i nc h. 



screen and retained on (the third largest 



s .^_^L e . < i t - e . ( ?L inch screen to _ 



Passing (the third largest size selected) inch 



screen and retained on Atkejfourth Jargest 



? i - z - e ._ s . e . 1 ?. c . t . e - d . ) .,inch screen to 



*Passing, etc 



Stone shall be sampled for quality and grading in accordance 



with the method described on page , paragraphs , of 



these specifications. 



Tests of the physical properties and grading of the stone shall 

 be made in accordance with the methods described or referred 

 to on pages of these specifications, tests Nos. : 



Method of sam- 

 pling. 



Methods of 

 testing. 



SPECIFICATION FOR COARSE AND FINE AGGREGATE FOR LARGE AGGREGATE 

 BITUMINOUS CONCRETE (BROKEN STONE OR SAND). 



Broken Stone foe Coarse Aggregate. 



The broken stone for coarse aggregate shall consist of angular 



fragments of .^?.?.!k**7.?.^.^°S^ > free from tnin 



or elongated pieces, soft or disintegrated stone, dirt, or other ob- 

 jectionable matter occurring either free or as a coating on the 

 stone. 

 The stone shall meet the following requirements : 



Per cent of wear not more than 



(or French coefficient not less than ) 



f Hardness not less than 



t Toughness : not less than 



t Absorption not more than % 



The broken stone for coarse aggregate, when tested by means 

 of laboratory screens, shall meet the following requirements : 



Per cent. 

 Passing ( the largest size selected) -i nc h screen 100 



Passing (the largest _size selected) -inch screen 

 and retained on ....(the second I largest size 



s^Jted). -inch screen to 



^Passing, etc 



Stone shall be sampled for quality and grading in accordance 



with the method described on page , paragraphs , 



of these specifications. 



* The number and size of screens and sieves may be continued as de- 

 sired by the engineer. For 10-mesh sieve and finer the wording should 



be : Passing mesh sieve and retained on mesh sieve _. 



to The last requirement should be : Passing inch screen 



(or mesh sieve) not more than (or not less than) 



t Tests recommended by the conference which it may be desirable to 

 omit in some instances. 



t The number and sizes of screens may be continued as desired by 

 the engineer. The last requirement should be : Passing 1/4-inch screen, 

 not more than 



General. 



Physical prop- 

 erties. 



Grading. 



Method of sam- 

 pling. 



