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Trang 1• STANDARD SPECIFICATIONS
FOR
BROKEN SLAG FOR BITUMINOUS MACADAM BASE1
· Serial Designation : D 195 - 2 7
These spcciftcations arc issued under the fi x ed designation D 19 S the li n \
n umber indicates the yenr of o riginal adoption as sLandar<;l or, in th e case of rc v i !l i on,
the ycnr of last reviliion ·
IssUED AS TENTATIVE, 1924; ADOPTI!.D 1 1927
1 These specifications cover { to ll-in., 1~; to 2}-in., and 2~ to Scop e 3~-in size broken slag to be used in the construction of a bituminous
macadam base in which the bituminous material is applied by the
penl!tmtion method and which is to be covered with any type of
surface course
will !Je penetrated with bituminous material, when a base of over
3~· in is dt'.sirerl
The J! · to 2~-in size is intended for use as a second cour:-.c which
is to be penetrated with bituminous material
The ~ to I ~ - -in size is intended to fill the surface voids when a
sheet asphalt or a fine-graded bituminous concrete is to ue placed
directly upon it This material can be omitted when a coarse-graded
bituminous concrete or a binder course is to bt: laid directly upon
the base
2 The broken slag shall be air-cooled blast-furnace slag and General shall consist of angular fragments reasonably uniform in density ~ht.aracter
" ItS
and quality, and reasonably free from thin, elongated or glassy
pieces, dirt or other objectionable matter
3 The weight per cubic foot of each size specified shall not he Weight less than 6.'5 lb
4 The coarse slag when tested by means of laboratory screens 21 to 3!-in shall conform to the following requirements: ~t~o 2!-in
(a) Passin~ 34-in screen not Jess than 95 per c:enL Size , Total passing 2!-in scr c r.n • notmoretbnn 15 "
(b) Passing 2t-in screen not less tban 95 per cent
Total passing ll-in screen not more than 15 "
-1 Under W11 o standatd i tation pr~ure of th e Society, these specifical.iuns arc • u nder the iurisd i c
-(455)
Trang 2! to 1!-in
Size
Methods of
Testing
Sampling
5 The intermediate size slag when tested by means of labora-tory screens shall conform to the following requirements:
Passing 1!-in screen not less than 95 per cent Passing l-in screen 25 to 7 5 "
Passing !-in screen not more than 15
6 Weight per Cubic Foot.-The weight per cubic foot shall be
determined in accordance with the Standard Method of Test for
of the American Society for Testing Materials.!
7 The method of sampling shall conform to the Standard Methods
of Sampling Stone, Slag, Gravel, Sand and Stone Block for Use as Highway Materials, Including Some Material Survey Methods (Serial Designation: D 7 5) of the American Society for Testing
NoTE.-The test values for quality of slag incorporated in these specifications are suggested as the lowest safe requirements It is not expected, however, that the limits for size and quality will be applicable to all conditions
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