FOEMS FOE SPECIFICATIONS, ETC., FOE EOAD MATEBIALS. 



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 on pages 



of these specifications, tests Nos. 



Broken Stone ob Sand foe Fine Aggregate. 



The fine aggregate shall be composed of sound, durable parti- 

 cles of stone or sand. The particles shall be free from a coating 

 of clay or loam. 



The broken stone or sand for fine aggregate, when tested by 

 means of laboratory sieves, shall meet the following requirements: 



Per cent. 



Passing 10-mesh sieve not less than 



Passing 10-mesh and retained on 40-mesh 



sieve — '. — to 



Passing 40-mesh and retained on 80-mesh 



sieve to 



Passing 80-mesh and retained on 200 mesh 



sieve to 



Passing 200-mesh sieve to 



Stone or sand shall be sampled for grading in' accordance with 



the method described on page , paragraphs , of 



these specifications, and tests of grading shall be made in accord- 

 ance with the method described or referred to on page of 



these specifications, test No. 



Method of sam- 

 pling. 



Methods of 



testing. 



General. 



Grading. 



Methods of 

 sampl i n g and 

 grading. 



SPECIFICATION FOR BROKEN STONE OR GRAVEL FOR COARSE AGGREGATE FOR 

 PORTLAND-CEMENT CONCRETE BASE. 



The broken stone or gravel aggregate shall consist of clean, General, 



hard, tough, durable rock. It shall contain no vegetable or other 

 deleterious matter, and shall be free from soft, thin, elongated 

 or laminated pieces. 



The broken stone or gravel shall be graded from coarse to fine, Grading. 



and when teseted by means of laboratory screens shall meet the 



following requirements : 



Per cent. 

 Passing inch screen 100 



Passing inch screen not more than 



Broken stone or gravel shall be sampled for grading in accord- Methods of 



sampl i n g and 

 ance with the method described on page , paragraphs , grading. 



of these specifications, and tests of grading shall be made in 



accordance Vvith the method described or referred to on page 



of these specifications, test No. 



SPECIFICATION FOR BROKEN STONE FOR COARSE AGGREGATE FOR PORTLAND- 

 CEMENT CONCRETE WEARING SURFACE. 



The broken stone aggregate shall consist of fragments of clean, 

 hard, tough, durable rock. It shall contain no vegetable or other 

 deleterious matter, and shall be free from soft, thin, elongated, 

 or laminated pieces. 



88979°— 17— Bull. 555 2 



General. 





