👉FULL STEPS: CONCRETE CUBE TEST (From Beginning up to Testing)
🚧1. Materials & Tools Required
⏺Cement, sand, aggregate, water
⏺Cube moulds (150 mm × 150 mm × 150 mm usually)
⏺Trowel, vibrator or tamping rod
⏺Weighing machine
⏺Curing tank or water container
⏺Compression testing machine (CTM)
🚧2. Preparation of Cube Moulds
⏺Clean the moulds.
⏺Apply oil on all inside surfaces to avoid sticking.
⏺Assemble moulds tightly with bolts.
⏺Place moulds on a flat, rigid surface.
🚧3. Concrete Mixing
🏷A. Measure materials
⏺Cement, sand, aggregate based on mix ratio (e.g., 1:2:4, or M20, M25 etc.).
⏺Measure water using correct water–cement ratio.
🏷B. Mix
⏺Mix thoroughly until uniform (by hand or mixer).
🚧4. Filling the Cube Moulds
⏺Fill the mould in three layers.
⏺Tamp 25 times using tamping rod OR Vibrate for 5–10 seconds Each layer.
⏺Make sure no air voids are left.
⏺Top surface must be leveled with a trowel.
🚧5. Initial Setting / Demoulding
⏺Keep the filled moulds undisturbed for 24 hours in a shaded place.
⏺After 24 hours, remove (demould) the cubes carefully.
🚧6. Curing
⏺Place cubes in a curing tank full of clean water.
⏺Temperature should be 20–27°C.
⚡️Cure for: 7 days test,
14 days test (optional),
28 days test (standard strength)
🚧7. Testing on Compression Machine
📍A. Preparation
⏺Remove cube from water at least 1 hour before testing.
⏺Clean surface and measure dimensions using a vernier caliper (to find exact area).
📍B. Placement in Machine
⏺Place cube on CTM between plates.
⏺Ensure cast/leveled face is on top (smooth face facing upwards).
⏺Center the cube properly.
📍C. Load Application
⏺Start the machine.
Apply load gradually at a rate of: 140 kg/cm² per minute (or ~2.9 kN/s).
⏺Continue until cube fails/cracks.
🏷8. Calculations
❇️For a 150 mm cube:
Area = 150 × 150 = 22500 mm²
⭐️Example:
Load at failure = 450 kN
Strength = 450,000 N / 22,500 mm² = 20 MPa
📜9. Reporting
Include:
⏺Mix ratio / grade
⏺Cube ID number
⏺Age (7 or 28 days)
⏺Load at failure
⏺Compressive strength
Average of 3 cubes
Any visual observations of cracks
@etconp
🚧1. Materials & Tools Required
⏺Cement, sand, aggregate, water
⏺Cube moulds (150 mm × 150 mm × 150 mm usually)
⏺Trowel, vibrator or tamping rod
⏺Weighing machine
⏺Curing tank or water container
⏺Compression testing machine (CTM)
🚧2. Preparation of Cube Moulds
⏺Clean the moulds.
⏺Apply oil on all inside surfaces to avoid sticking.
⏺Assemble moulds tightly with bolts.
⏺Place moulds on a flat, rigid surface.
🚧3. Concrete Mixing
🏷A. Measure materials
⏺Cement, sand, aggregate based on mix ratio (e.g., 1:2:4, or M20, M25 etc.).
⏺Measure water using correct water–cement ratio.
🏷B. Mix
⏺Mix thoroughly until uniform (by hand or mixer).
🚧4. Filling the Cube Moulds
⏺Fill the mould in three layers.
⏺Tamp 25 times using tamping rod OR Vibrate for 5–10 seconds Each layer.
⏺Make sure no air voids are left.
⏺Top surface must be leveled with a trowel.
🚧5. Initial Setting / Demoulding
⏺Keep the filled moulds undisturbed for 24 hours in a shaded place.
⏺After 24 hours, remove (demould) the cubes carefully.
🚧6. Curing
⏺Place cubes in a curing tank full of clean water.
⏺Temperature should be 20–27°C.
⚡️Cure for: 7 days test,
14 days test (optional),
28 days test (standard strength)
🚧7. Testing on Compression Machine
📍A. Preparation
⏺Remove cube from water at least 1 hour before testing.
⏺Clean surface and measure dimensions using a vernier caliper (to find exact area).
📍B. Placement in Machine
⏺Place cube on CTM between plates.
⏺Ensure cast/leveled face is on top (smooth face facing upwards).
⏺Center the cube properly.
📍C. Load Application
⏺Start the machine.
Apply load gradually at a rate of: 140 kg/cm² per minute (or ~2.9 kN/s).
⏺Continue until cube fails/cracks.
🏷8. Calculations
❇️For a 150 mm cube:
Area = 150 × 150 = 22500 mm²
⭐️Example:
Load at failure = 450 kN
Strength = 450,000 N / 22,500 mm² = 20 MPa
📜9. Reporting
Include:
⏺Mix ratio / grade
⏺Cube ID number
⏺Age (7 or 28 days)
⏺Load at failure
⏺Compressive strength
Average of 3 cubes
Any visual observations of cracks
@etconp
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