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WorksheetsTema 1: Concrete Compression Testing Machine
Total questions: 40
Worksheet time: 20mins
What is the main purpose of the Concrete Compression Testing Machine?
To measure workability of fresh concrete
To test the compressive strength of concrete specimens
To determine particle size of aggregates
To measure tensile strength of steel
What shapes of concrete specimens are typically tested in this CTM machine?
A. Beams and slabs
B. Cylinders or cubes
C. Soil samples
D. Steel bars
In operating the CTM machine, what should be recorded during the test?
The color of the concrete
The applied load
The temperature of the room
The weight of the operator
How is compressive strength calculated in CTM?
By dividing load by the specimen's length
By load divided by cross-sectional area
By multiplying slump value by density
By averaging sieve percentages
Why is safety ensured during testing(on CTM), such as wearing protective gear?
To increase the machine's speed
To prevent injury from flying debris or high loads
To make the specimen wetter
To calibrate the sieves accurately
What does the Slump Test measure?
Compressive strength
Workability or consistency of fresh concrete
Particle size distribution
Bearing capacity of soil
What tool is used as the mold in the slump test?
Sieve stack
Cone
Beam support
Penetration piston
What is the correct step after filling the mold(on slump test)?
Lift the cone and measure slump
Tamping each layer
Dry the concrete
Plot the curve
How do you interpret slump results?
Higher slump means poorer concrete quality
Slump indicates concrete quality based on workability
Zero slump means maximum strength
Slump measures density only
If the slump is too high, what problem might it indicate in concrete quality?
Too dry, leading to poor compaction
Too fluid, risking segregation and weakness
Ideal for all mixes
No effect on strength
What is the focus of the Sieve Analysis Set?
Testing flexural strength
Determining particle size distribution of aggregates
Measuring soil compaction
Surveying angles
What is the first step in sieve analysis?
Shaking the sieves
Drying and weighing aggregates
Soaking the sample
Mounting on UTM
After shaking, what is recorded for each sieve(on sieve analysis)?
The slump value
Retained weights
Load penetration
Stress-strain data
What is calculated to analyze gradation(on sieve analysis)?
Percentage passing each sieve
Compressive load
Moisture content
Elevation difference
Why might poor gradation (e.g., too many fine particles) affect concrete(on sieve analysis)?
It improves workability always
It can lead to voids or poor packing, reducing strength
It has no impact on testing
It only affects steel tensile
What does this Flexural Strength Testing machine test?
Compressive strength of cylinders
Flexural strength of concrete beams
Soil bearing ratio
Steel elongation
17. What specimen is used in Flexural Strength Testing Machine?
Cylinders
Concrete beams
Aggregates
Soil layers
How is the specimen placed before testing(on Flexural Strength Testing)?
On flat ground
On supports
In a slump cone
In sieves
19. What is observed during load applicationn(on Flexural Strength Testing)?
Color change
Fracture points
Angle readings
Moisture addition
Why use standard formulas to compute flexural stress(on Flexural Strength Testing Machine)?
To ignore fracture data
To accurately calculate bending strength from load and dimensions
To measure workability
To dry the beam
What is the CBR test used for?
Concrete workability
Measuring bearing capacity of subgrade soil for pavement
Aggregate sizing
Steel tensile
What is a key preparation step(on California Bearing Ratio Test)?
Soil sample soaking
Leveling theodolite
Mounting grips
During testing(on California Bearing Ratio), what data is recorded?
Slump height
Load-penetration data
Sieve weights
Angle measurements
What is plotted to find CBR value?
Compaction curve
CBR curve
Stress-strain graph
Gradation chart
If CBR value is low, what does it evaluate about the soil?
Excellent for pavement base
Poor bearing capacity, needing improvement
Ideal moisture only
No relation to design
What does the Proctor test determine?
Flexural strength
Optimum moisture content and maximum dry density of soil
Concrete slump
Distance elevation
Soil (in Proctor Compaction Test) is compacted in what manner?
Single layer
Continuous load
Sieves
Layers with different moisture contents
After compaction in Proctor Compaction Test Apparatus, what is measured?
Slump
Weights
Particle sizes
Tensile strain
What curve is plotted for analysis (in Proctor Compaction Test)?
CBR curve
Compaction curves
Flexural stress
Sieve passing
Why test multiple moisture contents (in Proctor Compaction Test)?
To find only dry density
To identify optimum for maximum density and stability
To soak indefinitely
To reduce layers
What is the main function of Total Station/Theodolite?
Testing concrete strength
Measuring angles, distances, and elevations in surveying
Soil compaction
Aggregate analysis
What is a setup step(in Theodolite / Total Station)?
Filling cone
Leveling the instrument
Soaking soil
Gripping steel
After setup, what is performed(in Theodolite / Total Station)?
Tamping
Angle reading and distance measurement
Load application
Sieve shaking
What ensures accurate data(in Theodolite / Total Station)?
Calibration and verification
Adding moisture
Observing fracture
Plotting slump
Why include field safety notes in procedures(on Theodolite / Total Station)?
To speed up readings
To prevent accidents from uneven terrain or equipment failure
To ignore elevations
To test soil only
What does UTM test for steel?
Compressive strength
Tensile strength and elongation
Workability
Particle gradation
What is prepared on UTM first?
Soil sample
Steel specimen measurement
Concrete beam
Sieve stack
How is load applied in UTM?
Suddenly
Gradually
By soaking
By tamping
What data determines yield and ultimate strength in UTM?
Slump results
Stress-strain data
CBR curve
Sieve percentages
What does failure mode analysis reveal about the specimen in UTM?
Only color
Weak points like necking or brittle fracture for material quality
Moisture level
No structural insight
