. Engineering research series . *The wet Two specimens. TABLE 19 TENSILE STRENGTH OF GRAVEL CONCRETE, SERIES II(Each Result from Test of One Specimen 5x5) Ultimate unit stress in pounds per square inch Sacks of cement percu. yd. cf concrete Age 12 days Age 28 days Age 3 months 48 80 116 212 332 358 *5. 54 176 231 273 ).83 () 293 324 387 5,93 () 312 378 484 371 357 386 421 404 462 () 372 304 320 *The very wet wet mixture. TABLE 20 TENSILE STRENGTH OF GRAVEL CONCRETE, SERIES III(Each Result the Average of Tests of Two Specimens 5x5) Sa
. Engineering research series . *The wet Two specimens. TABLE 19 TENSILE STRENGTH OF GRAVEL CONCRETE, SERIES II(Each Result from Test of One Specimen 5x5) Ultimate unit stress in pounds per square inch Sacks of cement percu. yd. cf concrete Age 12 days Age 28 days Age 3 months 48 80 116 212 332 358 *5. 54 176 231 273 ).83 () 293 324 387 5,93 () 312 378 484 371 357 386 421 404 462 () 372 304 320 *The very wet wet mixture. TABLE 20 TENSILE STRENGTH OF GRAVEL CONCRETE, SERIES III(Each Result the Average of Tests of Two Specimens 5x5) Sacks of cement percu. yd. of concrete Ultimate unit stress in pounds per square inch. Age 28 days Age 3 months 70 72 253 244 308 350 281 366 238 335 281 294 TABLE 21 TENSILE STRENGTH OF BROKEN STONE CONCRETE, SERIES I(Each Eesult the Average of Tests of Three Specimens 5x5) Ultimate unit stress in pounds per square inch Sacks of cement percu. yd. of concrete Age 12 days Age 28 days Age 3 months 38 *40 70 171 211 265 277 354 406 352 346 463 339 294 444 364 363 388 Two specimens. Physioal Properties of Densi ConcreU TAB] i TENSIL] STRENGTH OF BROKEN BTON1 CONCRETE, BSRIES IN(Eacb Result the Average ol Testa ol Three 5 sack- oi cement peren. yd. of concrete Ultimate unit stress in poundi ire i;i«!i ? L2 <!ays lays onths 36 iia 228294836837 282 285 62 184 ::I7 TRANSVERSE TESTS Scope of ih, investigation. For the tests of Series II (notransverse tests were made in Series I), eighteen specimens weremade of the gravel concrete, there being three specimens for each different percentage of cement. One of each kind wasbroken at
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