METHODS OF SAMPLING AND TESTING HIGHWAY MATERIALS 39 
2. The mechanical analysis shall be recorded in the following manner : 
Per cent 
Passing 200-niesh sieve 
Passing 80-mesh sieve and retained on 200-niesh sieve 
Passing 40-mesh sieve and retained on 80-mesh sieve 
Passing 10-rnesh sieve and retained on '40-mesh sieve __ 
Passing % -inch screen and retained on 10-mesh sieve 
Passing %-ineh screen and retained on %-inch screen 
Passing »i-inch screen and retained on %-inch screen 
100. 00 
3. In the sieve analysis of the sand fraction, the following sizes of sieves shall 
be used : 10-mesh. 40-mesh, 80-mesh, and 200-mesh. 
31. METHOD OF SAMPLING PAVING BRICK 
1. Place of sampling. — Where a standard rattler has been installed and is kept 
in an approved condition, and acceptable facilities for testing are furnished 
by the manufacturer, samples will be taken and tested at the plant by an 
inspector while cars are being loaded, provided daily shipments are sufficient 
to warrant it. Under all other conditions samples will be taken from the cars 
upon arrival at their destination. 
2. Method of selecting samples. — A single sample will be taken to represent 
each 10,000 to 15.000 brick according to conditions described later. No brick 
are to be included in the sample which are cracked or so deformed as to be 
unfit for laying under the specifications. 
3. (a) Samples from kilns. — When samples are taken directly from the kiln, 
the first set will usually be chosen as soon as enough brick have been removed 
from the front of the kiln to permit of obtaining a sample representative of 
both the full width and height of the kiln. Later samples are to be taken 
with the idea of representing three degrees of burning in the kiln, one sample 
to be selected from localities (usually the top and sides) to represent the 
hardest burned brick, one sample usually selected from the more central portion 
of any cross section of tlie kiln to represent medium-burned brick, and one 
sample, usually from the bottom layers and away from the sides, to represent 
the least-burned brick. Each of these samples should represent approximately 
15.000 brick. 
( b ) Samples taken from piles. — When the appearance of the pile of brick shows 
clearly that there is a considerable range in the degree of burning, samples to 
represent each of three degrees should be selected, as in the case of samples 
taken from kilns, each sample to represent about 10,000 brick. When the sur- 
face appearance of the brick does not furnish any indication of their uniformity, 
samples are to be taken at random, representing approximately 10,000 brick. 
(c) Samples from cars. — When a sample is taken from a carload it shall be 
selected in the same manner as previously described to represent three approxi- 
mate degrees of burning. 
4. Shipment of samples. — Samples which must be transported long distances 
by freight or express shall be carefully put up in packages holding not more 
than 12 brick each. When more than 6 brick are shipped in one package it 
shall be so arranged as to carry two parallel rows of brick side by side, and 
these rows shall be separated by a partition. In event of some of the brick 
being cracked or broken in transit, the sample shall be disqualified if there 
are not remaining 10 sound, undamaged brick. 
5. Storage and care of samples. — Samples shall be carefully handled to avoid 
breakage or injury. They shall be kept in the dry so far as practicable. If 
wet when received, or known to have been immersed or subjected to recent 
prolonged wetting, they shall be dried for at least six hours in a temperature 
of 100° F. before testing. 
32. METHODS OF TESTING BRICK 
(A. S. T. M. tentative standard method (.5), serial designation C 67-27 T, except as 
indicated. See p. 1) 
1. These methods cover the following tests for brick : 
The compresion test; 
The flexure or cross-bending test ; 
The rattler test. 
