WACEL Concrete 1 -Test Questions
and All Correct Answers.
What equipment is needed for testing concrete? - Answer wheelbarrow; bucket;
brush/rags/sponge; scoop; strike-of bar/plate; rods (3/8 in or 5/8 in); pressure meter;
volumetric meter (with alcohol); syringe; slump cone with flat, level, rigid, non-absorbent base;
tape measure; cylinder molds and caps; calibrated thermometer; mallet; scale
What equipment is moistened? - Answer Everything except the cylinder molds and caps
How many portions of concrete should be obtained to achieve a representative sample? -
Answer 2
How much time is permitted to pass between the first and second concrete sample portions are
gathered - Answer 15 minutes
After gathering samples for concrete sampling, what should be done before testing - Answer
mix the samples
for strength testing, what is the minimum sample size? - Answer 1 cubic foot
How much concrete is needed for all tests other than strength? - Answer varies depending
on aggregate size, test type, number of tests
how soon after gathering a sample should slump, temp, and air content tests be started? -
Answer within 5 minutes
How soon after gathering a sample should strength cylinders be started? - Answer within 15
minutes
What is the required range a thermometer must be able to read for concrete tests? - Answer
30 to 120 degrees F
how precise should temperature readings be? - Answer 1 degree F
how much space should a thermometer have around it when inserted into concrete? - Answer
3 inches
, Does a concrete thermometer need to be calibrated? - Answer yes
after inserting a concrete thermometer, what should be done to the concrete to achieve an
accurate reading? - Answer Pat the concrete around the thermometer to remove air pockets
how long should it take for a temperature reading to stabilize? - Answer 2-5 minutes
how precise should a temperature reading be recorded? - Answer 1 degree F
What should be done to prepare a slump cone? - Answer it should be placed somewhere
flat, level, and free of vibrations. It should also be moistened
How should the cone be secured to the floor? - Answer it should be clamped to the base or
stepped on
How should the concrete slump cone be filled? - Answer 3 lifts equal by volume rodded 25
times
How tall is the first lift in the slump cone? - Answer about 2 5/8 inches
how tall is the second lift in the slump cone? - Answer about 6 1/8 inches
How tall is the final lift of the slump cone? - Answer Heaped above the top
If not enough concrete is in the slump cone during final rodding, what should be done? -
Answer more concrete should be added and the rodding should pick up where it left off.
What should be done to excess concrete on top of the cone after rodding? - Answer it should
be rolled off with the rod
Before lifting the slump cone, what should be done? - Answer clean off the base plate
How quickly and how high should the slump cone be lifted? - Answer it should be lifted 12
inches over the course of 3-7 seconds
How should slump be measured? - Answer From the top of the inverted cone to the original
displaced center to the nearest 1/4 inch
and All Correct Answers.
What equipment is needed for testing concrete? - Answer wheelbarrow; bucket;
brush/rags/sponge; scoop; strike-of bar/plate; rods (3/8 in or 5/8 in); pressure meter;
volumetric meter (with alcohol); syringe; slump cone with flat, level, rigid, non-absorbent base;
tape measure; cylinder molds and caps; calibrated thermometer; mallet; scale
What equipment is moistened? - Answer Everything except the cylinder molds and caps
How many portions of concrete should be obtained to achieve a representative sample? -
Answer 2
How much time is permitted to pass between the first and second concrete sample portions are
gathered - Answer 15 minutes
After gathering samples for concrete sampling, what should be done before testing - Answer
mix the samples
for strength testing, what is the minimum sample size? - Answer 1 cubic foot
How much concrete is needed for all tests other than strength? - Answer varies depending
on aggregate size, test type, number of tests
how soon after gathering a sample should slump, temp, and air content tests be started? -
Answer within 5 minutes
How soon after gathering a sample should strength cylinders be started? - Answer within 15
minutes
What is the required range a thermometer must be able to read for concrete tests? - Answer
30 to 120 degrees F
how precise should temperature readings be? - Answer 1 degree F
how much space should a thermometer have around it when inserted into concrete? - Answer
3 inches
, Does a concrete thermometer need to be calibrated? - Answer yes
after inserting a concrete thermometer, what should be done to the concrete to achieve an
accurate reading? - Answer Pat the concrete around the thermometer to remove air pockets
how long should it take for a temperature reading to stabilize? - Answer 2-5 minutes
how precise should a temperature reading be recorded? - Answer 1 degree F
What should be done to prepare a slump cone? - Answer it should be placed somewhere
flat, level, and free of vibrations. It should also be moistened
How should the cone be secured to the floor? - Answer it should be clamped to the base or
stepped on
How should the concrete slump cone be filled? - Answer 3 lifts equal by volume rodded 25
times
How tall is the first lift in the slump cone? - Answer about 2 5/8 inches
how tall is the second lift in the slump cone? - Answer about 6 1/8 inches
How tall is the final lift of the slump cone? - Answer Heaped above the top
If not enough concrete is in the slump cone during final rodding, what should be done? -
Answer more concrete should be added and the rodding should pick up where it left off.
What should be done to excess concrete on top of the cone after rodding? - Answer it should
be rolled off with the rod
Before lifting the slump cone, what should be done? - Answer clean off the base plate
How quickly and how high should the slump cone be lifted? - Answer it should be lifted 12
inches over the course of 3-7 seconds
How should slump be measured? - Answer From the top of the inverted cone to the original
displaced center to the nearest 1/4 inch
