Procedure: 1. Compression tests on specimens shall be made as soon as practicable after removal from the moist storage. A 28-day test shall be performed within +-20 hours of the 28thday. Test specimens shall be kept moist by any convenient method during the period between removals from moist storage and testing. They shall be tested in moist condition. 2. All test specimens for a given test age shall be broken within the permissible time tolerance prescribed below. TEST AGE 24 HOURS PERMISSIBLE TOLERANCE +-0.5 HOURS OR 2.1% 3 DAYS 2 HOURS OR 2.8% 7 DAYS 6 HOURS OR 3.6% 28 DAYS 20 HOURS OR 3.0% 90 DAYS 2 DAYS OR 2.2 % 3. With a clean rag or rush clean the bearing faces of the bearing blocks, test the specimens and exclusion controller (elastomeric cps). 4. Rest the specimen on the lower extrusion controller, place the top extrusion controller on the specimen, and check the spacing between the sides of the specimen and the extrusion controllers to ensure no contact between the cylinder and the steel. Slide the specimen and extrusion controller configuration into the center of the concentric circles of the lower bearing block. Check the alignment with the upper bearing face after lowering it into position. 5. Apply the load to the specimen. During the first half of the anticipated loading phase, a higher loading rate shall be permitted. The remainder of the loading shall be 20 to 50 psi/second (0.14 to 0.34 Mpa) Note: For 6 inches (150 mm) diameter specimens, the loading rate shall be 550 to 1400 lbs. /second. For 4-inch (100 mm) diameter specimen, the loading rate shall be 250 to 620
Procedure: 1. Compression tests on specimens shall be made as soon as practicable after removal from the moist storage. A 28-day test shall be performed within +-20 hours of the 28thday. Test specimens shall be kept moist by any convenient method during the period between removals from moist storage and testing. They shall be tested in moist condition. 2. All test specimens for a given test age shall be broken within the permissible time tolerance prescribed below. TEST AGE 24 HOURS PERMISSIBLE TOLERANCE +-0.5 HOURS OR 2.1% 3 DAYS 2 HOURS OR 2.8% 7 DAYS 6 HOURS OR 3.6% 28 DAYS 20 HOURS OR 3.0% 90 DAYS 2 DAYS OR 2.2 % 3. With a clean rag or rush clean the bearing faces of the bearing blocks, test the specimens and exclusion controller (elastomeric cps). 4. Rest the specimen on the lower extrusion controller, place the top extrusion controller on the specimen, and check the spacing between the sides of the specimen and the extrusion controllers to ensure no contact between the cylinder and the steel. Slide the specimen and extrusion controller configuration into the center of the concentric circles of the lower bearing block. Check the alignment with the upper bearing face after lowering it into position. 5. Apply the load to the specimen. During the first half of the anticipated loading phase, a higher loading rate shall be permitted. The remainder of the loading shall be 20 to 50 psi/second (0.14 to 0.34 Mpa) Note: For 6 inches (150 mm) diameter specimens, the loading rate shall be 550 to 1400 lbs. /second. For 4-inch (100 mm) diameter specimen, the loading rate shall be 250 to 620
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Procedure:
1. Compression tests on specimens shall be made as soon as practicable after removal from the
moist storage. A 28-day test shall be performed within +-20 hours of the 28thday. Test
specimens shall be kept moist by any convenient method during the period between removals
from moist storage and testing. They shall be tested in moist condition.
2. All test specimens for a given test age shall be broken within the permissible time tolerance
prescribed below.
TEST AGE
PERMISSIBLE TOLERANCE
24 HOURS
+-0.5 HOURS OR 2.1%
3 DAYS
2 HOURS OR 2.8%
7 DAYS
6 HOURS OR 3.6%
28 DAYS
20 HOURS OR 3.0%
90 DAYS
2 DAYS OR 2.2 %
3. With a clean rag or rush clean the bearing faces of the bearing blocks, test the specimens and
exclusion controller (elastomeric cps).
4. Rest the specimen on the lower extrusion controller, place the top extrusion controller on the
specimen, and check the spacing between the sides of the specimen and the extrusion
controllers to ensure no contact between the cylinder and the steel. Slide the specimen and
extrusion controller configuration into the center of the concentric circles of the lower bearing
block. Check the alignment with the upper bearing face after lowering it into position.
5. Apply the load to the specimen. During the first half of the anticipated loading phase, a higher
loading rate shall be permitted. The remainder of the loading shall be 20 to 50 psi/second
(0.14 to 0.34 Mpa)
Note: For 6 inches (150 mm) diameter specimens, the loading rate shall be 550 to 1400 lbs.
/second. For 4-inch (100 mm) diameter specimen, the loading rate shall be 250 to 620
Ibs. /second.
6. Apply the load until the specimen fails, and record the maximum load supported by the
specimen during the test rounded to the nearest 500 lb.
Transcribed Image Text:CALCULATION:
0= Q/TtR?
Where:
o=compressive strength (MPa)
Q=load at failure (N)
R=radius of specimen (mm)
Test Data and result
Sample #
Age (days)
R (mm)
Area (mm^2)
Q(N)
o (MPa)
1
7
100
400000
7
100
410000
3
7
100
390000
4
14
100
530000
14
100
540000
14
100
520000
7
21
100
600000
8
21
100
620000
9
21
100
610000
10
28
100
700000
11
28
100
680000
12
28
100
720000
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