How do you prepare ground before road base — Road Project

How to Prepare Subgrade for Road Base

Before road base is placed, the subgrade should be accepted for both level and condition. An uneven or weak supporting surface can lead to thickness variation and premature failure above it.

Before moving material

Confirm formation level and identify unaccepted areas.

Receiving operation and checks

Inspect and accept before spreading base aggregate. Record level and material checks for the same work area.

Adding more base material is not automatically a remedy for weak subgrade.

Survey Existing Ground

Surveying existing ground is the first project-stage record of the surface to be changed. Agree the coverage before the survey so critical features are not omitted.

Before moving material

Define boundaries of work, reference control and required detail.

Receiving operation and checks

Issue the survey with datum, units and limitations stated. Check control-point agreement and representation of abrupt terrain changes.

A survey deliverable should not be confused with a legal boundary determination.

Prepare for Compaction

Preparation for compaction ensures that the compactor receives suitable material in the intended layer arrangement. Grading and moisture conditioning must fit the project requirements.

Before moving material

Confirm material, layer depth and compaction method.

Receiving operation and checks

Compact and test according to the brief. Inspect edges and areas inaccessible to the main compaction plant.

There is no single pass count or moisture target suitable for all materials.

Record the job inputs

Use this checklist to turn the scenario into a specific brief. Retain the design revision and agree who accepts each completed layer.

• Existing condition, extent and the reason for intervention
• Required finished purpose, receiving operation and acceptance criteria
• Material type, layer role, source, receiving area and volume state
• Reference levels, datum, survey method and issued design revision
• Available tractor, implement configuration, travel route and turning space
• Checks before work, stopping points and evidence retained at handover

Checklist ticks apply only while this page is open. Include the completed brief in your project records.

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