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Saturday, 16 September 2023

90% Compaction for Granular Material

The challenges associated with conducting compaction tests on granular materials highlight the differences between cohesive and non-cohesive soils. We emphasize the impracticality of applying conventional compaction methodologies to granular materials and the need to seek guidance from industry experts to ensure appropriate compaction assessment.

Background: Cohesive soils exhibit unique properties, such as the capacity to bond together and significant changes in density with moisture content variations. Compaction tests on cohesive soils typically involve determining Maximum Dry Density (MDD) and Optimum Moisture Content (OMC), which play a crucial role in assessing compaction characteristics.

Challenges with Granular Materials: Granular materials, including aggregates used for bedding, differ significantly from cohesive soils due to their non-cohesive nature. Non-cohesive materials consist of particles that do not adhere together and have minimal sensitivity to moisture content fluctuations. This characteristic makes it impractical to establish an OMC equivalent to MDD, as observed in cohesive soils. Consequently, the traditional compaction methodologies outlined in the standards may not align with the unique compaction properties of granular materials. The standard mandates a minimum compaction requirement of 90%, and the client is unwavering in their adherence to this standard, resulting in the issuance of Non-Conformance Reports (NCRs) when it is not met.

Seeking Industry Expert Guidance: Anyone can enlighten this matter.

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