FORMS FOR SPECIFICATIONS, ETC., FOR ROAD MATERIALS. 
29 
pockets, cracks, or marked laminations. Kiln marks shall not 
exceed of an inch, and the wearing surface shall show 
but slight kiln marks. 
Representative samples of the brick shall meet the following 
requirements when subjected to the rattler test : 
Average loss by abrasion on one 01 more tests, not more 
than per cent. 
Maximum difference in per cent loss by abrasion when more 
than one representative sample is tested, not more than 
per cent. 
A maximum of three tests will be used as a basis for re- 
jection. 
The bricks shall meet the following requirements : 
Length to inches. 
Width. to inches. 
Depth, to inches. 
Variations among bricks from a single plant shall not exceed 
the following limits: 
Variation in length, inch. 
Variation in width, inch. 
Variation in depth, inch. 
If the edges of the bricks are rounded, the radius shall not 
exceed of an inch. 
Only bricks with lugs on one side, raised not less than of 
an inch, nor more than of an inch, shall be used. 
The bricks shall be subjected to inspection subsequent to de- 
livery at the place of use, prior to and during laying, in order 
to cull out and reject upon variations from the general and 
dimensions clauses and upon the following grounds : 
All bricks which are broken through, or chipped in such man- 
ner that neither wearing surface remains substantially intact, 
or in such manner that the lower or bearing surface is reduced 
in area by more than one-fifth. 
All bricks which are cracked to a depth greater than -inch 
on any surface, or which are cracked on the wearing surface. 
All bricks which are so off-size or so misshaped, bent, twisted, 
or kiln-marked that they will not form a proper surface or align 
properly with other bricks. 
All bricks which are obviously too soft and too poorly vitrified 
to endure street wear. 
Bricks shall be sampled in accordance with the method de- 
scribed on page of these specifications, and tested in 
accordance with the method described or referred to on page 
of these specifications, test No. 
Battler test. 
Dimeasion*. 
Visual in- 
spection. 
Methods of 
sampl ins a a d 
testing. 
Note. — The committee does not recommend an absorption test 
for general use in specifications. If special conditions make such 
a test necessary, it may be specified. 
