FORMS FOB SPECIFICATIONS, ETC., FOE EOAD MATERIALS. 



15 



Per cent. 

 Passing (the largest size selected) inch screen 

 and retained on (tie second largest size 



selected) inch screen to 



Passing (the second largest size selected) inch 

 screen and retained on (the. third largest 



size selected) inch screen to 



♦Passing, etc 



Slag 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 slag 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 BROKEN SLAG FOR COARSE AGGREGATE FOR PORTLAND- 

 CEMENT CONCRETE BASE. 



The broken slag aggregate shall consist of fragments of air-cooled 

 (insert types ; allowable) slag, nonglassy in character, which shall 



have been exposed to the weather for a period of at least f 



prior to use. It shall be clean, hard, tough, and durable, free 

 from soft, thin, elongated, or laminated pieces, and shall contain 

 no vegetable or other deleterious matter. 



The slag shall meet the following requirement : 



Weight per cubic foot not less than pounds. 



The broken slag aggregate shall be graded from coarse to fine, 

 and when tested by means of laboratory screens shall meet the 

 following requirements : 



Per cent. 



Passing inch screen 100 



Passing inch screen. not more than 



The slag shall be sampled for quality and grading in accordance 



with the method described on page , paragraphs , 



of these specifications. 



The tests of the physical properties and grading of the slag 

 shall be made in accordance with the methods described or re- 

 ferred to on pages of these specifications, tests Nos. 



General. 



Physical prop- 

 erties. 



Grading. 



Method of sam- 

 pling. 



Methods of 

 testing. 



SPECIFICATION FOR GRANULATED SLAG FOR CUSHION. 



The granulated slag shall consist of clean, sharp, gritty parti- 

 cles of water-cooled i in . s .^.types .allowable) s i a g, all of which shall 

 pass a inch laboratory screen. 



The granulated slag shall be sampled for quality and size in 



accordance with the method described on page , paragraphs 



, of these specifications; and the tests of its size shall be 



made in accordance with the method described or referred to on 

 page of these specifications, test No. 



General. 



Methods of 

 sampl i n g and 

 grading. 



* The number and sizes 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) 



f The conference recommends that the words " one year " be inserted. 



