🏗️ CONCRETE QUALITY
CONTROL CHECKLIST
·
99.2%
Success Rate • Zero Major Failures
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🚨 CRITICAL WARNING
·
Concrete failures don't announce themselves during construction. They reveal themselves years later when
repair costs are 10-20 times higher than prevention costs. This checklist is
your insurance against catastrophic concrete failures
1. Concrete Grade Verification CRITICAL
Verify
specified concrete grade matches structural drawings and design requirements.
Cross-check with structural consultant for any recent revisions.
Action
Items:
✔️ Compare drawing specifications with mix design
✔️ Get written confirmation from structural consultant
✔️ Document any grade changes with approval
2. Mix Design Approval CRITICAL
Ensure
mix design is approved by structural consultant and meets all specified
parameters including strength, durability, and workability requirements.
Action
Items:
✅
Obtain written mix design approval
✅
Verify cement type and brand
✅ Check aggregate size and quality
3. Supplier Quality Verification
Verify
ready-mix supplier credentials, plant certification, and quality control
systems. Check recent test certificates and plant calibration records.
Action
Items:
✅ Check supplier ISO
certification
✅ Verify plant calibration
certificates
✅ Review last 3 months quality data
4. Weather Condition Assessment
Check
weather forecast for concreting day. Plan for temperature control, rain
protection, and wind conditions that may affect concrete quality.
Action
Items:
✅ Check
48-hour weather forecast
✅ Arrange
rain protection measures
✅ Plan
for hot/cold weather concreting
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🚚 STAGE 2: DELIVERY & RECEIVING INSPECTION
5. Delivery Challan Verification CRITICAL
Verify
every delivery challan matches the ordered concrete grade, quantity, and time.
Check mixing time and transportation duration
Action
Items:
✔️ Verify concrete grade on challan
✔️ Check mixing and loading time
✔️ Confirm quantity and location
6. Slump Test – Mandatory CRITICAL
Conduct
slump test for every truck/batch before placing. Record results and reject
concrete if slump doesn't meet specifications.
Action
Items:
✅
Test every truck upon arrival
✅
Record slump values immediately
✅ Reject if outside tolerance limits
7. Visual Inspection
Visual
check for segregation, bleeding, foreign materials, or abnormal consistency.
Look for signs of over-mixing or contamination.
Action
Items:
✅ Check
for segregation signs
✅ Look
for foreign materials
✅ Assess consistency uniformity
8. Temperature Check
Monitor
concrete temperature at delivery. Ensure it's within acceptable limits
(typically 5°C to 35°C) for proper hydration.
Action
Items:
✅ Measure
concrete temperature
✅ Record
ambient temperature
✅ Take
corrective action if needed
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🧪 STAGE 3: SAMPLING & TESTING PROTOCOL
9. Systematic Sampling CRITICAL
Take
samples from middle third of discharge, never from beginning or end. Collect
minimum 3 samples per 100 cum or per day, whichever is higher
Action
Items:
✔️ Sample from middle of discharge
✔️ Take minimum 3 samples per day
✔️ Label samples with complete details
10. Cube Casting - 3 per Sample
Cast
minimum 3 cubes per sample for 7-day, 28-day testing. Use proper compaction and
follow IS 516 standards strictly.
Action
Items:
✅
Cast 3 cubes minimum per sample
✅
Follow IS 516 compaction method
✅
Label with date, location, grade
Photograph
every testing activity with GPS location and timestamp. Maintain digital
records for future reference and disputes.
Action
Items:
✅ Photo
document all tests
✅ GPS
tag all sample locations
✅ Maintain
digital database
For
critical structural elements, conduct 3-day or 7-day strength tests to predict
28-day strength and take early corrective action if needed.
Action
Items:
✅ Test
critical elements at 3/7 days
✅ Predict
28-day strength
✅ Plan
remedial action if needed
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⚡ STAGE 4: PLACEMENT & COMPACTION CONTROL
13. Placement Time Control CRITICAL
Complete
concrete placement within 30 minutes of arrival for normal conditions, 20
minutes for hot weather. Monitor closely during placement.
Action
Items:
✔️ Record arrival and placement time
✔️ Ensure continuous placement
✔️ Avoid cold joints
14. Vibration Standards
Use
appropriate vibrators, maintain proper insertion spacing and duration. Avoid
over-vibration that can cause segregation.
Action
Items:
✅
Check vibrator functioning
✅
Maintain proper spacing
✅
Control vibration duration
15. Layer Thickness Control
Maintain
proper lift thickness (maximum 500mm for normal concrete). Ensure uniform
placement and avoid honeycomb formation
Action
Items:
✅ Control
lift thickness
✅ Check
for honeycomb
✅ Ensure
uniform placement
16. Surface Finishing
Proper
surface finishing techniques, timing of finishing operations, and protection
against plastic shrinkage cracking.
Action
Items:
✅ Time
finishing operations correctly
✅ Protect
from rapid moisture loss
✅ Check
surface quality
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