Particle Size Distribution

UKAS Accredited

Standard(s): BS EN 933-1:2012
Lab Test
Particle Size Distribution testing determines the range and proportion of different-sized particles in aggregates. Conducted according to BS EN 933-1:2012, this test helps assess aggregate quality and suitability for concrete, asphalt, and other construction applications.

Enquire about this test

The Process

Aggregates are separated using a series of standard sieves. The material retained on each sieve is weighed to calculate the percentage of each particle size. Amtest ensures precise sieving and accurate reporting to deliver reliable data for your project.

The Reason

Knowing the PSD of aggregates is critical for mix design, compaction, and performance. Proper particle distribution affects strength, workability, and durability of concrete and asphalt, and helps prevent issues such as segregation or excessive voids.

The Application

PSD data guides engineers and contractors in selecting the right aggregate for concrete, asphalt, or earthworks. It ensures that materials meet project specifications, improving quality, consistency, and long-term performance.

Frequently Asked Questions

Can you carry out particle size distribution testing on-site or in the lab?

We offer laboratory-based PSD testing. Our technicians can collect samples from your site or you can send material to our lab for rapid, accurate analysis.

Why choose your lab for particle size distribution testing?

We provide experienced technicians, fast turnaround, and accredited methods to ensure your PSD results are reliable, actionable, and recognised by engineers and regulators. Partnering with us reduces risk and supports project success.

Can Amtest test both coarse and fine aggregates?

Yes. Amtest can handle a wide range of aggregate sizes, from fine sands to coarse gravels, ensuring your PSD results reflect your actual project materials.

View more Aggregates testing services:

View all

Plastic Limit

Determination of the plastic limit of fine-grained soils in accordance with BS EN ISO 17892-12:2018+A2:2022.
BS EN ISO 17892-12:2018+A2:2022
Aggregates
UKAS Accredited
Lab Test
View Test

Particle Size Distribution

Determination of particle size distribution of aggregates using sieving in accordance with BS EN 933-1:2012.
BS EN 933-1:2012
Aggregates
UKAS Accredited
Lab Test
View Test

Sample Reduction

Sample reduction by riffle box, by quartering, or to a test portion of a specified mass within a small tolerance
BS EN 932-2:1999
Aggregates
UKAS Accredited
Lab Test
View Test

Dynamic Cone Penetration (TRL-DCP)

Rapid measurement of the in-situ strength of existing flexible pavements constructed with unbound materials.
DMRB, CS 229 Data for Pavement Assessment Rev.0: 2020
Aggregates
UKAS Accredited
Lab Test
Site Test
View Test

In-Situ California Bearing Ratio (CBR)

Penetration of soil with a plunger over a standard area. The harder the surface, the higher the CBR percentage.
Aggregates
Site Test
View Test

Constituents of Course Recycled Aggregates

Ensure the quality and compliance of recycled aggregates with our constituents analysis, supporting sustainable and reliable construction practices.
BS EN 933-11:2009
Aggregates
UKAS Accredited
Site Test
View Test

Plasticity Index

A higher Plasticity Index indicates a greater range of water content where soil remains plastic, signifying higher compressibility and potential for settlement.
BS EN ISO 17892-12:2018+A2:2022
Aggregates
UKAS Accredited
Lab Test
View Test

Water Content

Determination of the water content of aggregates in accordance with BS EN 1097-5:2008.
BS 1377-2:2022
Aggregates
UKAS Accredited
Lab Test
View Test

In-Situ Bulk Density Nuclear Method

The in-situ bulk density nuclear method ensures soil compaction meets construction standards by measuring density and moisture directly on-site.
BS 1377-9:1990
Aggregates
Site Test
View Test

Resistance to Fragmentation – Los Angeles Test

Subjects a coarse aggregate sample to abrasion, impact, and grinding.
BS EN 1097-2:2020
Aggregates
UKAS Accredited
Lab Test
View Test
Lab Test
Particle Size Distribution

BS EN 933-1:2012 specifies the test method used to determine the particle size distribution (grading) of aggregates by dry or wet sieving. The procedure defines how to separate aggregate particles into size fractions and calculate the proportion retained on each sieve.

This data is essential for assessing compliance with specification limits and understanding material suitability for concrete, asphalt, and other construction applications.

BS EN 933-1:2012