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Aggregate Density Verification Checklist

Use this checklist before recording aggregate density results to verify container calibration, sample preparation, filling method, weighing, specific gravity source, void content, and IS 383:2016 compliance.

βœ“68 Inspection Points
βœ“10 Verification Categories
βœ“Equipment and Container Verification+
  • Container volume is confirmed by calibration β€” filled with water, water weighed, and volume calculated as mass Γ· 1 (since 1 litre of water = 1 kg at standard temperature).
  • Correct container size is used β€” 3 litres for fine aggregate (≀4.75mm), 15 litres for coarse aggregate up to 40mm, 30 litres for aggregate up to 150mm per IS 2386 (Part III).
  • Container is clean, dry, and free from any residual aggregate or moisture from a previous test.
  • Container exterior is wiped clean before each weighing to avoid false mass readings.
  • Weighing balance is zeroed before each weighing.
  • Balance sensitivity is adequate β€” IS 2386 (Part III) requires sensitivity to 0.5% of the sample mass.
  • Tamping rod is 16mm diameter and at least 600mm long for rodded bulk density tests.
  • No dents, deformations, or bulges on container walls that would affect internal volume.
βœ“Sample Preparation Verification+
  • Aggregate sample is representative of the batch β€” taken from multiple points in the stockpile or truck, not from the surface alone.
  • Sample size is sufficient β€” at least 1.25 times the container volume to allow proper filling without running short.
  • For standard IS 2386 results, aggregate is oven-dried at 105Β°C for a minimum of 24 hours before testing.
  • If oven-drying is not possible on site, aggregate is air-dried and the moisture condition is recorded alongside the result.
  • Aggregate is cooled to room temperature after oven drying before weighing β€” hot aggregate gives slightly lower density readings.
  • Sample is not contaminated with soil, organic matter, or aggregate of a different type or size.
  • For coarse aggregate tests, fines passing 4.75mm sieve are removed before filling the container.
βœ“Filling Procedure Verification β€” Loose Bulk Density+
  • Aggregate is poured into the container from a maximum height of 5cm above the container rim, as specified in IS 2386 (Part III).
  • Aggregate is poured in a single continuous operation β€” not added in stages or topped up after settling.
  • Surface is struck off level with a straight tamping rod β€” no heaping above the rim and no depression below it.
  • Container is not shaken, vibrated, or tapped during or after filling.
  • No manual consolidation or pushing of particles is done during loose filling.
  • Test is repeated at least three times and the average is used for reporting per IS 2386 requirements.
βœ“Filling Procedure Verification β€” Rodded Bulk Density+
  • Container is filled in exactly three equal layers.
  • Each layer is tamped 25 times with the 16mm tamping rod, with strokes distributed uniformly over the surface.
  • Tamping rod does not penetrate into the layer below when rodding the second and third layers.
  • After rodding the final layer, surface is struck off level with the tamping rod.
  • Container is not dropped, jarred, or vibrated during or between layers.
  • Rodded condition is clearly recorded alongside the result β€” rodded and loose results must not be mixed.
βœ“Weighing and Calculation Verification+
  • Empty container mass (M1) is recorded before filling.
  • Container plus aggregate mass (M2) is recorded after striking off the surface.
  • Net aggregate mass is calculated as M2 minus M1 β€” not estimated or assumed.
  • Container volume used in the formula matches the calibrated volume, not a nominal or labelled value.
  • Bulk density is calculated as (M2 βˆ’ M1) divided by container volume in litres, giving kg/litre.
  • Result is converted to kg/mΒ³ by multiplying kg/litre by 1,000 before comparing to IS 383:2016 reference ranges.
  • At least three test repetitions are completed and individual results are within 1% of each other before averaging.
  • If any individual result deviates by more than 1% from the others, that test is discarded and repeated.
βœ“Specific Gravity Verification+
  • Specific gravity value used is from an actual pycnometer or water displacement test per IS 2386 (Part III) β€” not assumed from a generic table unless clearly labelled as a reference value.
  • If a reference specific gravity is used, the aggregate type and source match the reference material closely.
  • Specific gravity is within the IS 383:2016 acceptable range of 2.4 to 2.9 for normal-weight concrete aggregate.
  • For RCA (Recycled Concrete Aggregate), lower specific gravity (2.0–2.5) is expected and noted in the report.
  • Specific gravity source β€” measured or reference β€” is recorded alongside the result.
  • Specific gravity is not confused with bulk density β€” Gs of approximately 2.65 for granite is the particle density ratio, not the bulk unit weight.
βœ“Void Content Verification+
  • Void content is calculated using the IS 2386 (Part III) formula: Voids (%) = ((Gs βˆ’ Ξ³) Γ· Gs) Γ— 100, where Ξ³ is bulk density in kg/litre.
  • Bulk density is converted to kg/litre (not kg/mΒ³) before substituting into the void content formula.
  • Calculated void content is compared against the expected range for the aggregate type β€” typically 30–45% for coarse aggregate and 28–40% for fine aggregate.
  • If void content exceeds 45% for coarse aggregate, aggregate gradation is reviewed β€” high voids typically indicate single-size or poorly graded material.
  • If void content is below 28%, aggregate source and grading are verified β€” unusually low voids may indicate contamination with fines or a measurement error.
  • Void content result is not used alone as a pass/fail criterion β€” it is reviewed alongside bulk density and specific gravity together.
βœ“IS 383:2016 Compliance Verification+
  • Measured bulk density is within the typical range for the aggregate type β€” 1,200–1,750 kg/mΒ³ for normal-weight concrete aggregate.
  • Specific gravity is within 2.4–2.9 for normal-weight concrete applications per IS 383:2016.
  • If aggregate is RCA, usage is limited to permitted replacement percentages β€” 25% for plain concrete, 20% for RCC up to M25 grade.
  • Aggregate is classified correctly as fine (≀4.75mm) or coarse (>4.75mm) per IS 383:2016 definitions before comparison.
  • Results are compared to IS 383:2016 reference values for the specific aggregate type, not a generic threshold.
  • Test certificate from the aggregate supplier referencing IS 2386 and IS 383 is requested and filed for project records.
βœ“Result Recording and Reporting+
  • All three individual test results are recorded β€” not just the average β€” for traceability.
  • Moisture condition of aggregate at time of test is recorded (oven-dry / air-dry / as-received).
  • Filling method (loose or rodded) is clearly stated in the report.
  • Container size and calibrated volume are recorded in the report.
  • Specific gravity source (measured or reference) is noted.
  • Date of test, aggregate source or quarry, aggregate type and size, and name of person conducting the test are recorded.
  • Photographs of the test setup, filled container, and struck-off surface are taken before the container is disturbed.
  • Result is compared to previous test results for the same aggregate source to check for consistency across batches.
βœ“Before Accepting the Aggregate Batch+
  • Bulk density result is within acceptable range for the specified aggregate type.
  • Specific gravity is within IS 383:2016 limits for the intended concrete grade.
  • Void content is within the expected range and consistent with aggregate gradation.
  • Results match or are close to the supplier's test certificate values β€” large deviations trigger rejection or further testing.
  • Site engineer or quality supervisor has reviewed and signed off the test result.
  • Aggregate batch is not used in structural concrete until test results are confirmed acceptable.
  • Any out-of-range result is escalated to the structural engineer before proceeding.
Inspection Notes+
Use this checklist with calibrated test apparatus and the project quality plan.
Record moisture condition, filling method, specific gravity source, and all individual repetitions.
Escalate out-of-range density, void content, or specific gravity results before using aggregate in structural concrete.
Common Mistakes+

Using Nominal Container Volume Without Calibration

A small container-volume error directly changes the calculated bulk density. Confirm the calibrated volume instead of relying only on a label.

Mixing Loose and Rodded Results

Loose and rodded bulk density represent different packing conditions. Record the method clearly and compare only like-for-like values.

Applying Void Formula With kg/m3 Instead of kg/litre

IS 2386 void content formula uses bulk density in kg/litre. Convert kg/m3 by dividing by 1,000 before substituting.

Related Calculators & Guides

Aggregate Density CalculatorCalculate bulk density, specific gravity checks, particle density, and void content.Aggregate Weight CalculatorConvert aggregate volume and density into kg, tonnes, truck loads, and cost.Concrete Mix Design CalculatorUse verified aggregate density values for concrete mix quantity planning.

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