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Granular Base Course

highway.pavement_system.base_course

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Definition

Load-spreading granular or bound layer above the sub-base.

Class kind: component
Abstract: no
Depth: 2
Origin: reference source
Ontology: engineering-reference-book.highway v0.1.0
Aliases: WMM, Wet Mix Macadam, WBM, Base Course
Abbreviations: WMM, WBM
Last changed: 7/27/2026, 2:50:06 PM

Identification

Positive labels: Granular Base Course, WMM, Wet Mix Macadam, WBM, Base Course
Negative labels: —
Visual features: —
Min identity clues: 2

Evidence

Preferred views: pavement_detail, pavement_layer_schedule
Evidence types: view, detail, schedule, note, dimension, level, section_callout
Source trace required: yes

Measurements (3)

Name	Symbol	Unit	Required
Width	`W`	m	required
Thickness	`T`	mm	required
Length	`L`	m	required

Relationships (1)

placed_onhighway.pavement_system.granular_subbase

BOQ items (1)

Item code	Formula	Result	Unit
`highway.pavement.base_course.volume`	`W * T * L`	volume	m3

Facets

material: wet_mix_macadam, water_bound_macadam, crusher_run_macadam

Validation

Blocking if missing: yes
Human review allowed: yes

no_evidence_no_number
retain_document_page_bbox_and_evidence_id
do_not_mix_drawing_revisions
do_not_average_conflicting_values
prefer_explicit_labels_over_shape_only
match_plan_profile_and_cross_section_when_applicable

Provenance

Basis: taxonomy_spec
Project values included: no
mindmap_module_spec_taxonomy_highway: no page list

Children (0)

None — this is a leaf class and can be deleted.