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79 Cards in this Set
- Front
- Back
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What is pad thickness? |
13mm +- 2mm |
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The pads outside diameter cannot be smaller than __________ the inside diameter ring of retainer. |
2mm |
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What pad rubber is most commonly used? And can any pad rubber be used? |
Neoprene and Yes as long as it qualifies. |
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the Electrometric pad must have the following information; |
1. the manufacturer's name 2. The shore A hardness 3. The range of concrete compressive strength |
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What is the height of the retaining ring? |
25mm +- 3mm |
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The plane of unbonded caps is within? |
0.05mm or 0.002inch |
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The plane of the unbonded caps cannot have grooves deeper than? |
0.25 mm |
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The plane of the unbonded caps cannot have grooves greater in surface area than? |
32mmsquared |
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Specimens plane grooves or depressions cannot exceed? |
5mm |
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Is a qualification test required for a pad with PSI [1,5 00] to [6,000] |
No |
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How many maximum reuses can a Shore A 70 with compressive strength of 4,000 psi to 7,000 psi have until it needs to be re-qualified for more? |
100 |
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Is it qualification test required for a Pad with compressive strength greater that 12,000 psi? |
Trick question do not use a pad and in a press for cylinder with needed PSI of greater than 12,000. Not permitted. |
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What is shore A hardness 60's psi |
2,500 to 7,000 psi |
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When counting for reuse count what is the lowest PSI break you can count? |
2,000 Psi |
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The glass capping plate needs to be at least ______ thick? |
6mm thick |
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Machine metal plates must at least be __________ thick. |
11mm thick |
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Polished granite plates must be at least ________ thick |
3 inches |
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For sulfur mortar what plates can be used? |
Stone and metal plates can be used but the recessed area cannot be more than 12 mm deep |
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Plates should be at least _________ in diameter greater than the specimen |
25 mm |
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A plates plane to not depart by more than _________ |
0.05mm or 0.002inch |
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A plates plane should not have grooves or dents greater than __________ |
0.25mm |
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No cap can depart from perpendicularity of the axis for more than _______ |
0.5° |
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For freshly molded cylinders how long should you wait until capping? |
2 to 4 hours until settling is done |
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What is the only type of capping material that you can use on a freshly molded cylinders |
Neat cement paste |
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What kind of materials can you use on hardened concrete specimens? |
Gypsum paste, need concrete paste, and sulfur moltar. |
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When capping a freshly molded cylinder what can you not do? |
Rock the cylinder with the cement on. Creates air voids. |
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After capping a freshly molded cylinder what should you put on it? |
Burlap |
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What is the first thing you do when you're going to cap a freshly molded cylinder? |
Remove water and laitance |
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When capping a freshly molded cylinder what do you do after removing the water and laitance? |
You put neat cement rounded at the top, use a oiled glass plate putting it flatly on top of the cement using a twisting motion I create a flat surface as well as removing excess paste and minimizing air voids |
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What do you do before capping a freshly molded cylinder |
Wait 2 to 4 hours after molding for it to settle |
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When capping hardened concrete specimens you must remove__________ |
Any oily and waxy materials on the cylinders ends |
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In high strength gypsum pace can you use fillers or extenders? True or false |
False |
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What is the water to cement ratio for gypsum paste? |
0.26 and 0.30 |
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When using gypsum paste if you use less water and stir vigorously it normally results in a |
Psi of 5,000 at a wait time of 1 to 2 hours before testing. |
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When mixing gypsum paste using higher water normally _________________ |
Extends working time but reduces strength |
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How long until gypsum can be removed |
45 minutes |
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Limitedto concrete having a density greater than or Concrete is limited to having a density in excess of... |
50lb/ft3 |
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Astm C39 is used to determine |
the compressive strength of cylindrical specimens, prepared and cure with applicable practices |
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if the cylinder length to diameter ratio is 1.50 the correction factor is |
.96 |
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if the cylinder length to diameter ratio is 1.75 what is the correction factor |
.98 |
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if the cylinder length to diameter ratio is 1.25 what is the correction factor |
.93 |
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if the cylinder length to diameter ratio is 1.00 what is the correction factor |
.87 |
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results of this test method are used as a basis for |
Quality control of concrete proportioning, mixing, and placing operations. determination of compliance with specification and evaluating effectiveness of admixtures |
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Strength values will depend on |
Size, Shape, batching, mixing, sampling methods, molding, age, temperature, and moist conditions during curing |
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Testing machine must be verified when; |
within the last 13 months, on original installation, or after relocation, immediately after any adjustments or repairs, or any loud indicating system, or whenever there is reason to suspect the accuracy. |
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The testing machine needs to be able to, hint produce... |
Produce a load greater than the specimens strength, be able to apply and maintain a continuous load rate without shock, power-operated, and large enough to hold the test specimen and calibration device |
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The percentage of error that a load can range in is
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+/- 1% of the indicated load |
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the upper bearing block center shall coincide with the center of the bearing face within _______ of the radius of the sphere |
+/-5% |
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upper bearing block; Ball, and socket need to |
withstand the maximum load compacity without deforming |
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The diameter of the upper bearing block sphere needs to be at least _____ the diameter of the cylinder |
75% |
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The bearing face must freely rotate ____ in any direction |
4°
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the top and bottom bearing blocks must be ________
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Parallel |
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The lower bearing block must be at least ___ inch thick when new and _____ inch after resurfacing
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1.0 and .9 |
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________ goes under the lower bearing block |
spacers |
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Spacers must be |
solid steel and one opening in the middle is permitted |
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Spacers never... |
come in direct contact with the specimen |
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•Ifthe diameter of the upper bearing face exceeds the nominal diameter of thecylinder by more than _____, concentric circles not more than .03” deep and .04”wide can be inscribed on the face of the upper bearing block |
1) .5 diameter 2) .03 deep 3) .04 wide |
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Cleanand lubricate the curved surfaces of the socket and of the spherical portion ofthe upper bearing block every _________ or asspecified by the manufacturer |
6 Months |
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The normal diameter of the specimen is 2in and the max diameter of the round face bearing is 4in what is the max dimensions of the square bearing face is? |
4 by 4 |
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The normal diameter of the specimen is 3in and the max diameter of the round face bearing is 5in what is the max dimensions of the square bearing face is? |
5 by 5 |
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The normal diameter of the specimen is 4in and the max diameter of the round face bearing is 6.5in what is the max dimensions of the square bearing face is? |
6.5 by 6.5 |
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The normal diameter of the specimen is 6in and the max diameter of the round face bearing is 10in what is the max dimensions of the square bearing face is? |
10 by 10
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The normal diameter of the specimen is 8in and the max diameter of the round face bearing is 11in what is the max dimensions of the square bearing face is? |
11 by 11 |
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Alldensity calculations shall be reported to the nearest |
1 lb./ft3 |
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Regardlessof the method you use, you will need a scale or balance that is accurate towithin ______ of the mass being measured. |
0.3% |
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density dimension method procedure step one and two |
Removesurface moisture with a towel and Weighthe cylinder |
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density dimension method procedure step 3 and 4 |
Measurethe length of the cylinder to the nearest .05” at three evenly spaced locationsaround the cylinder and Computethe average length and record to the nearest .05” |
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Density-submergedweighing method steps 1 and 2 |
Removesurface moisture with a towel and Weighthe cylinder in air |
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Density-submerged weighing method steps 3 and 4 |
Submergethe cylinder in water at a temperature of 73.5 ± 3.5˚ for 15±5 seconds and Recordthe apparent mass of the cylinder while submerged in water. |
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When breaking a cylinder that is going to have the ends of the cylinder touching the press the planeness must be within |
.002in |
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When breaking a cylinder in unbonded caps the planeness of the cylinder must be within |
.2in |
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when breaking a cylinder in bonded caps the planeness cannot depart by more than a |
1/8in |
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when taking Cylinderdiameter measurements you can take |
one out of every 10 or Measuring3 cylinders per day |
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breaking a 24-hour cylinder your tolerance is |
+/- 0.5hours |
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breaking a 3-day cylinder your tolerance is |
+/- 2 hours |
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breaking a 7-day cylinder your tolerance is |
+/- 6 hours |
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breaking a 28-day cylinder your tolerance is |
+/- 20 hours |
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breaking a 90-day cylinder your tolerance is |
+/- 2 days |
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•Reportthe calculated compressive strength to the nearest 10 psi •Averagemeasured diameter •Cross-sectionalarea to the nearest .01•Maximumload pounds •Typeof fracture pattern •Ageof specimen •Ifany defects are in the specimen or cap •Ifdensity was determined, report the density to the nearest 1 lb./ft3 |
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