METHODS OF SAMPLING AND TESTING HIGHWAY MATERIALS 125 
Table l: 
-BrincU hardness numbers 
[Steel ball. 10 millimeters in diameter, pressures of 500 and 3,000 kilograms. Prepared by the engineering 
mechanics section. Bureau of Standards. The values given in this table for hardness numbers are 
merely solutions of the equation given in the introductory paragraphs. They do not imply that Brinell 
tests are feasible on materials of a hardness indicated by the highest values in the table] 
Brinell 
Brinell 
Brinell 
Brinell 
Brinell 
Di- 
hardness 
Di- 
hardness 
Di- 
hardness 
Di- 
hardness 
Di- 
hardness 
am- 
> 
*o. 
am- 
X 
0. 
am- 
X 
0. 
am- 
.\ 
"o. 
am- 
Xo. 
eter of 
eter of 
inden- 
eter of 
inden- 
eter of 
inden- 
eter of 
inden- 
inden- 
tation 
500- 
3.000- 
tation 
500- 
3,000- 
tation 
500- 
3.000- 
tation 
500- 
3,000- 
tation 
500- 
3,000- 
load 
load 
load 
load 
load 
load 
load 
load 
load 
load 
Mm. 
Kg. 
Kg. 
Mm. 
Kg. 
Kg. 
Mm. 
Kg. 
Kg. 
Mm. 
Kg. 
Kg. 
Mm. 
Kg. 
Kg. 
2.00 
158 
945 
2.70 
85.7 
514 
3.40 
53. 4 
321 
4.10 
36.2 
217 
4.80 
25.9 
156 
2.01 
156 
936 
2.71 
85.1 
510 
3.41 
53.1 
319 
4.11 
36.0 
216 
4.81 
2.5.8 
155 
2.02 
154 
926 
2.72 
84.4 
507 
3.42 
52.8 
317 
4.12 
35.8 
215 
4.82 
25.7 
154 
2.m 
153 
917 
2.73 
83.8 
503 
3.43 
52.5 
315 
4.13 
35.7 
214 
4.83 
25.6 
154 
2.04 
151 
908 
2.74 
83.2 
499 
3.44 
52.2 
313 
4.14 
35.5 
213 
4.84 
25.5 
153 
2.05 
150 
899 
2. 7.5 
82.6 
495 
3.45 
51.8 
311 
4.15 
35.3 
212 
4.85 
25.4 
152 
2.06 
148 
890 
2.76 
81.9 
492 
3.46 
51. 5 
309 
4.16 
35.1 
211 
4.86 
25.3 
152 
2.07 
147 
882 
2.77 
81.3 
488 
3.47 
51.2 
307 
4.17 
34.9 
210 
4.87 
25.1 
151 
2.08 
146 
873 
2.78 
80.8 
485 
3.48 
50.9 
306 
4.18 
34.8 
209 
4.88 
25.0 
150 
2.09 
144 
865 
2.79 
80.2 
481 
3.49 
50.6 
304 
4.19 
34. 6 
208 
4.89 
24.9 
150 
2.10 
143 
856 
2.80 
79.6 
477 
3. .50 
50.3 
302 
4.20 
34.4 
207 
4.90 
24.8 
149 
2.11 
141 
848 
2.81 
79.0 
474 
3.51 
50.0 
300 
4.21 
34.2 
205 i 
4.91 
24.7 
148 
2.12 
140 
840 
2.82 
78.4 
471 
3.52 
49.7 
298 
4.22 
:»4. 1 
204 
4.92 
24.6 
148 
2.13 
139 
832 
2.83 
77.9 
467 
3.53 
49.4 
297 
4.23 
33.9 
203 
4.93 
24.5 
147 
2.14 
137 
824 
2.84 
77.3 
464 
3.54 
49.2 
295 
4.24 
33.7 
202 
4.94 
24.4 
146 
2.15 
136 
817 
2.85 
76.8 
461 
3.55 
48.9 
293 
4.25 
33.6 
201 
4.95 
24. 3 
146 
2.16 
135 
809 
2.86 
76.2 
457 
3.56 
48.6 
292 
4.26 
33.4 
200 
4.96 
24.2 
145 
2.17 
134 
802 
2.87 
75. 7 
454 
3.57 
48.3 
290 
4.27 
33.2 
199 
4.97 
24.1 
144 
2.18 
132 
794 
2.88 
75. 1 
451 
3.58 
48.0 
288 
4.28 
33.1 
198 
4.98 
24.0 
144 
2.19 
131 
787 
2.89 
74. 6 
448 
3.59 
47.7 
286 
4.29 
32.9 
198 
4.99 
23.9 
143 
2.20 
130 
780 
2.90 
74. 1 
444 
3.60 
47.5 
285 
4.30 
32.8 
197 
5.00 
23.8 
143 
2.21 
129 
772 
2.91 
73.6 
441 
3.61 
47.2 
283 
4.31 
32.6 
196 
5.01 
23.7 
142 
2.22 
128 
765 
2.92 
73.0 
438 
3.62 
46.9 
282 
4.32 
32.4 
195 
5.02 
23.6 
141 
2.23 
126 
758 
2.93 
72.5 
435 
3.63 
46.7 
280 
4.33 
32.3 
194 
5.03 
23.5 
141 
2.24 
125 
752 
2.94 
72.0 
432 
3.64 
46.4 
278 
4.34 
32.1 
193 
5.04 
23.4 
140 
2.25 
124 
745 
2. 95 
71.5 
429 
3.65 
46.1 
277 
4.35 
32.0 
192 
5.05 
23.3 
140 
2.26 
123 
738 
2.96 
71.0 
426 
3.66 
45.9 
275 
4.36 
31.8 
191 
5.06 
23.2 
139 
2.27 
122 
732 
2.97 
70.5 
423 
3.67 
45.6 
274 
4.37 
31.7 
190 
5.07 
23. 1 
138 
2.28 
121 
725 
2.98 
70. 1 
420 
3.68 
45.4 
272 
4.38 
31.5 
189 
5.08 
23.0 
138 
2.29 
120 
719 
2.99 
69.6 
417 
3. 69 
45.1 
271 
4.39 
31.4 
188 
5.09 
22.9 
137 
2.30 
119 
712 
3.00 
69.1 
415 
3^70 
44.9 
269 
4.40 
31.2 
187 
5.10 
22.8 
137 
2.31 
118 
706 
3.01 
68.6 
412 
3.71 
44.6 
268 
4.41 
31.1 
186 
5.11 
22.7 
136 
2.32 
117 
700 
3.02 
68.2 
409 
3.72 
44.4 
266 
4.42 
30.9 
185 
5.12 
22.6 
135 
2.33 
116 
694 
3.03 
67.7 
406 
3.73 
44.1 
265 
4.43 
30.8 
185 
5.13 
22.5 
135 
2.34 
115 
688 
3.04 
67.3 
404 
3.74 
43.9 
263 
4.44 
30.6 
184 
5.14 
22.4 
134 
2.35 
114 
682 
3.05 
66.8 
401 
3. 75 
43.6 
262 
4.45 
30.5 
183 
5. 15 
22.3 
134 
2.36 
113 
676 
3.06 
66.4 
398 
3.76 
43.4 
260 
4.46 
30.3 
182 
5.16 
22.2 
133 
2.37 
112 
670 
3.07 
65.9 
395 
3.77 
43.1 
259 
4.47 
30.2 
181 
5.17 
22.1 
133 
2.38 
111 
665 
3.08 
65.5 
393 
3.78 
42.9 
257 
4.48 
30.0 
180 
5.18 
22.0 
132 
2.39 
110 
659 
3.09 
65.0 
390 
3.79 
42.7 
256 
4.49 
29.9 
179 
5.19 
21.9 
132 
2.40 
109 
653 
3.10 
64.6 
388 
3.80 
42.4 
255 
4.50 
29.8 
179 
5.20 
21.8 
131 
2.41 
108 
648 
3.11 
64.2 
385 
3.81 
42.2 
253 
4.51 
29.6 
178 
5.21 
21.7 
130 
2.42 
107 
643 
3.12 
63.8 
383 
3.82 
42.0 
252 
4.52 
29.5 
177 
5.22 
21.6 
130 
2.43 
106 
637 
3.13 
63.3 
380 
3.83 
41.7 
250 
4.53 
29.3 
176 
5.23 
21.6 
129 
2.44 
105 
632 
3.14 
62.9 
378 
3.84 
41.5 
249 
4.54 
29.2 
175 
5.24 
21.5 
129 
2.45 
104 
627 
3.15 
62.5 
375 
3.85 
41.3 
248 
4.55 
29.1 
174 
5.25 
21.4 
128 
2.46 
104 
621 
3.16 
62.1 
373 
3.86 
41.1 
246 
4.56 
28.9 
174 
5.26 
21.3 
128 
2.47 
103 
616 
3.17 
61.7 
370 
3.87 
40.9 
245 
4.57 
28.8 
173 
5.27 
21.2 
127 
2.48 
102 
611 
3.18 
61.3 
368 
3.88 
40.6 
244 
4.58 
28.7 
172 
5.28 
21.1 
127 
2.49 
101 
606 
3.19 
60.9 
366 
3.89 
40.4 
242 
4.59 
28.5 
171 
5.29 
21.0 
126 
2. .50 
100 
601 
3.20 
60.5 
363 
3.90 
40.2 
241 
4.60 
28.4 
170 
5.30 
20.9 
126 
2. 51 
99.4 
597 
3.21 
60.1 
361 
3.91 
40.0 
240 
4.61 
28.3 
170 
5.31 
20.9 
125 
2.52 
98.6 
592 
3.22 
59.8 
359 
3.92 
39.8 
239 
4.62 
28.1 
169 
5.32 
20.8 
125 
2.53 
97.8 
587 
3.23 
59.4 
356 
3.93 
39.6 
237 
4.63 
28.0 
168 
5.33 
20.7 
124 
2.54 
97.1 
582 
3.24 
59.0 
354 
3.94 
39.4 
236 
4.64 
27.9 
167 
5.34 
20.6 
124 
2. 55 
96.3 
578 
3.25 
58.6 
352 
3.95 
39.1 
235 
4.65 
27. 8 
167 
5.35 
20.5 
123 
2.56 
95.5 
573 
3.26 
58.3 
350 
3.96 
38.9 
234 
4.66 
27.6 
166 
5.36 
20.4 
123 
2. 57 
94.8 
.569 
3.27 
57.9 
347 
3.97 
38.7 
232 
4.67 
27.5 
165 
5.37 
20.3 
122 
2.58 
94.0 
564 
3.28 
57. 5 
345 
3.98 
38.5 
231 
4.68 
27.4 
164 
5.38 
20.3 
122 
2.59 
93.3 
560 
3.29 
57.2 
343 
3.99 
38.3 
230 
4.69 
27.3 
164 
5.39 
20. 2 
121 
2.60 
92.6 
555 
3.30 
56.8 
341 
4.00 
38.1 
229 
4.70 
27.1 
163 
5.40 
20.1 
121 
2.61 
91.8 
551 
3.31 
56. 5 
.339 
4.01 
37.9 
228 
4.71 
27.0 
162 
! 5.41 
20.0 
120 
2.62 
91.1 
.547 
3.32 
56.1 
337 
4.02 
37.7 
226 
4.72 
26.9 
161 
5.42 
19.9 
120 
2. 63 
90.4 
543 
3.33 
55.8 
335 
4.03 
37.5 
225 
4.73 
161 
5.43 
19.9 
119 
2.64 
89.7 
538 
3.34 
55.4 
333 
4.04 
37.3 
224 
4.74 
26.6 
160 
5.44 
19.8 
119 
2.65 
89.0 
534 
3.35 
55.1 
331 
4.05 
37.1 
223 
4.75 
159 
5.45 
19.7 
118 
2.66 
88.4 
530 
3.36 
54.8 
329 
4.06 
37.0 
222 
4.76 
26 4 
158 
| 5.46 
19.6 
118 
2.67 
87.7 
526 
3.37 
54.4 
326 
4.07 
36.8 
221 
4.77 
26.3 
158 
i 5.47 
19.5 
117 
2.68 
87.0 
522 
3.38 
54.1 
325 
4.08 
36.6 
219 
4.78 
26.2 
157 
5. 18 
19.5 
117 
2.69 
86.4 
518 
3.39 
53.8 
323 
4.09 
36.4 
218 
4.79 
26.1 
156 
1 5. 49 
19.4 
110 
