SAMPLING AND TESTING HIGHWAY MATERIALS. 35 



II. VISUAL INSPECTION. 



It shall be the right of the buyer to inspect the bricks, subsequent to their delivery 

 at the place of use and prior to or during laying, to cull out and reject upon the follow- 

 ing grounds: 



(20) All bricks which are broken in two or chipped in such a manner that neither 

 wearing surface remains substantially intact, or that the lower or bearing surface is 

 reduced in area by more than one-fifth. Where bricks are rejected upon this ground, 

 it shall be the duty of the purchaser to use them so far as practicable in obtaining the 

 necessary half bricks for breaking courses and making closures, instead of breaking 

 otherwise whole and sound bricks for this purpose. 



(21) All bricks which are cracked in such a degree as to produce defects such as are 

 defined in section 20, either from shocks received in shipment and handling or from 

 defective conditions ot manufacture, especially in drying, burning, or cooling, unless 

 such cracks are plainly superficial and not such as to perceptibly weaken the resistance 

 of the brick to its conditions of use. 



(22) All bricks which are so off size, or so misshapen, bent, twisted, or kiln marked, 

 that they will not form a proper surface as defined by the paving specifications, or 

 align with other bricks without making joints other than those permitted in the 

 paving specifications. 



(23) All bricks which are obviously too soft and too poorly vitrified to endure street 

 wear. When any disagreement arises between buyer and seller under this item, it 

 shall be the right of the buyer to make two or more rattler tests of the brick which he 

 wishes to exclude, as provided in section 2, and if in either or both tests the bricks 

 fall beyond the maximum rattler losses permitted under the specifications, then all 

 bricks having the same objectionable appearance may be excluded, and the seller 

 shall pay for the cost of the test. But if under such procedure the bricks which have 

 been tested as objectionable shall pass the rattler test, both tests falling within the 

 permitted maximum, then the buyer can not exclude the class of material represented 

 by this test and he shall pay for the cost of the test. 



(24) All bricks which differ so markedly in, color from the type or average of the 

 shipment as to make the resultant pavement checkered or disagreeably mottled in 

 appearance. This section shall not be held to apply lo the normal variations in color 

 which may occur in the product of one plant among bricks, which will meet the 

 rattler test as referred to in sections 15, 16, and 17, but shall apply only to differences 

 of color which imply differences in the material of which the bricks are made, or 

 extreme differences in manufacture. 



Absorption. 7 — The absorption test shall be made on five rattled brick, which shall 

 be immersed in water for 48 hours. The absorption shall be expressed in per cent of 

 the weight of the brick before immersion. 



7 Not a part of the A. S. T. M. standard method. 



