How should aggregates be sampled from a loaded vehicle?

By taking at least three distinct increments from trenches dug across the load at different levels to avoid segregated surface material.

IS 2430

: 1986

Methods for Sampling of Aggregates for Concrete

CurrentFrequently UsedTesting MethodMaterials Science · Cement, Concrete, Aggregates and RCC

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IS 2430 outlines the standard procedures for obtaining representative samples of fine and coarse aggregates for concrete from various sources such as stockpiles, bins, and vehicles. It details the minimum gross sample weights based on aggregate size and establishes standardized methods for sample reduction (like quartering) prior to laboratory testing.

Methods for Sampling of Aggregates for Concrete

Quick Reference Values

Min gross sample weight for 63mm max size aggregate100 kg

Min gross sample weight for 40mm max size aggregate50 kg

Min gross sample weight for 20mm max size aggregate25 kg

Min gross sample weight for 12.5mm and 10mm max size aggregate10 kg

Min gross sample weight for fine aggregate (sand)10 kg

Practical Notes

Always take samples from multiple random locations (top, middle, and bottom) in a stockpile to prevent segregation bias.

When sampling from stockpiles, remove the outer layer of material first, as it is often subject to segregation and weathering.

Proper sample reduction using a mechanical sample splitter or the manual quartering method is crucial to ensure the lab test sample remains representative of the gross sample.