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compressive strength of concrete. INTRODUCTION: On November 1st Miner Testing
Laboratories was contacted by Giggum, Gougem, and Giggum ...
... Table 5 ? Compressive strength developments of hardened concrete Mixture Designation
Ref.1 Ref.2 F1 F2 24 Hours 191 333 105 286 7 Days 356 547 357 484 28 Days ...
... Compressive Strength: Compressive strength of the concrete being sent to the formwork
has to be verified if it is strong enough to be placed. ...
... at South Side Typical Longitudinal Frame Elevation Material Specifications Concrete:
f’c = 4000 psi (28 days minimum compressive strength) Reinforcing Steel ...
... increased compressive and flexural strength, lower absorption, increased resistance
to weathering, better bond between successive layers and between concrete ...
Submitted by psyctest on July 2, 2008
Category: Science
Words: 1213 | Pages: 5
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INTRODUCTION:
On November 1st Miner Testing Laboratories was contacted by Giggum, Gougem, and Giggum architect, Arch E. Tech and Possum Grape Sand and Gravel, Inc. superintendent Rocky Clay in order to test sample of their 4200 psi concrete. The concrete was mixed at the Miner Testing Lab previously and was allowed to harden for 21 days. The compressive strength was determined by crushing 6 inch diameter cylinders and the flexural strength was determined by breaking a 6x6x24 inch beam in a beam breaker. The technicians also found the Modulus of Elasticity by use of various strain gauges on six inch cylinder and also the use of the beam breaking machine.
LABORATORY INVESTIGATION:
The following testing procedures were used:
COMPRESSIVE STRENGTH OF CYLINDER CONCRETE SPECIMENS
The test began by removing two cylinders from the cure room. One was capped with sulfur caps and other was test with neoprene caps. The cylinders were measured for diameter two time and the average was then taken of the two values. The technicians also made sure the specimen stay moist all the way up to the test. The specimen was wrapped in a shroud to minimize flying debris and then put in the crushing device. The neoprene caps had to be put in place before the shroud was put on and then put into the machine. The cylinder was then applied with a steady load from the top until it failed. They were then unloaded and the type of failure was noted and also the final load at failure was recorded.
FLEXURAL STRENGTH OF CONCRETE
This test was run according to the ASTM C 78 specs. It began with the removing of the beam from the cure room. The beam was keep moist at all time when out of the cure to ensure a proper test. The corners of the beam were then smoothed with a rubbing stone. The beam was then marked all the way around at 3, 9, 15, and 21 inches. These marks aid in the alignment of the beam in the...
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