OM Group supplies the crushed, graded aggregate used in Wet Mix Macadam for road and infrastructure projects across North and South Goa, produced at its own crushing operation and matched to MoRTH Clause 406 grading and project specification.
It forms the base course above the granular sub-base (GSB) in a flexible pavement, and is produced from crushed fractions — nominally 40mm, 20mm, 10mm, 6mm and crusher-run screenings — proportioned by trial to a specified 0–53mm grading envelope, not supplied as a single aggregate size.
OM Group supplies the crushed, graded aggregate used in WMM production, produced at its own crushing operation and matched against MoRTH Clause 406 grading and the applicable project specification. OM Group operates the crusher that produces the coarse and fine fractions WMM is blended from — the wet-mixing operation itself (the pugmill/pan-mixer stage) is described on this page as the general WMM production process, not claimed as OM Group's own plant operation. See How OM Group Supports WMM Projects below.
| Entity | Wet Mix Macadam |
| Full form | Wet Mix Macadam |
| Abbreviation | WMM |
| Category | Pavement base-course material |
| Primary reference | MoRTH Clause 406 |
| Guideline | IRC:109-2015 |
| Typical role | Base course, above the granular sub-base |
| Material | Clean, crushed, graded aggregate mixed with controlled water |
| Supplier — OM Group | Crushed and graded aggregate supply for WMM production |
| Service area | Goa — North Goa and South Goa |
OM Group's role in this relationship is aggregate supply, not wet-mix production — that distinction is maintained consistently across this page, its metadata and its structured data.
The actual pavement structure, layer thicknesses and material requirements depend on the pavement design, traffic category, project specification and applicable contract documents — not every road uses exactly this structure.
WMM is composed of crushed, graded aggregate fractions — nominally 40mm, 20mm, 10mm and 6mm, together with crusher-run screenings — proportioned by trial and error to achieve the gradation the applicable MoRTH table specifies. No single fraction is WMM on its own; the material only becomes WMM once the fractions are blended to the specified curve and mixed with controlled moisture.
OM Group's crushing operation at Banda Wafoli produces exactly these fractions as part of its multi-grade aggregate output — see the 20mm, 10mm and 6mm aggregate pages for each fraction's own specification. Proportioning these fractions into a WMM blend, and mixing that blend with controlled moisture, is a separate operation from producing the fractions themselves — see How OM Group Supports WMM Projects below for exactly where OM Group's role sits in that chain.
| Factor | WMM | GSB |
|---|---|---|
| Full form | Wet Mix Macadam | Granular Sub-Base |
| Pavement position | Base course | Sub-base |
| Primary reference | MoRTH Clause 406 | MoRTH Clause 401 |
| Material | Crushed, graded aggregate blend, plant-mixed | Blended granular material, can include natural sand |
| Moisture conditioning | Controlled, forced mixing at a wet mix plant | Project/process dependent |
| Plant mixing | Wet mix plant (pugmill/pan mixer) | Blended at source/crusher to grading |
| Role | Structural pavement base | Foundation/sub-base layer |
| Substitution | Not automatically interchangeable | Not automatically interchangeable |
WMM and GSB are complementary pavement materials with different structural roles and specification requirements; one should not be substituted for the other without engineering approval. Full GSB detail is on the Granular Sub-Base page.
Water Bound Macadam (WBM) is the older method of binding coarse aggregate with screenings and water, compacted on site. WMM is plant-mixed with controlled moisture and forced mixing, and carries stricter aggregate requirements — its Aggregate Impact Value limit (≤30%) is tighter than WBM's. WBM remains a recognised construction method under applicable specifications; its use depends on the project's specification rather than WMM being an automatic replacement.
No. Crusher-run and WMM are not automatically the same material. WMM requires controlled proportioning to the specified grading envelope and controlled moisture mixing at a wet mix plant; crusher-run describes a mixed-size crusher output and does not by itself establish compliance with the WMM specification. Uncontrolled multi-size crusher output only becomes WMM once it is proportioned to the Clause 406 curve and mixed with controlled moisture.
40mm, 20mm, 10mm and 6mm aggregate are each one particle size — inputs to a WMM blend, not WMM itself. WMM is a blend proportioned to a single 0–53mm grading envelope, not any one fraction supplied alone. Ordering a single aggregate size and using it as WMM does not meet Clause 406's grading requirement.
Governing documents: MoRTH Clause 406 (Specifications for Road and Bridge Works, Section 400, Fifth Revision), IRC:109-2015, and IRC:126 for wet-mix-plant guidance. Test methods referenced include IS 2386 (aggregate tests) and IS 2720 Part 8 (OMC determination).
| Parameter | General standard requirement | Basis |
|---|---|---|
| Aggregate Impact Value | ≤30% (stricter than WBM) | MoRTH Clause 406, general reference |
| Los Angeles Abrasion | ≤40% | MoRTH Clause 406, general reference |
| Combined flakiness & elongation index | ≤30% | MoRTH Clause 406, general reference |
| Plasticity Index (fraction passing 425 micron) | ≤6 | MoRTH Clause 406, general reference |
| Water absorption | >2% triggers a soundness test (IS 2386 Part 5) | MoRTH Clause 406, general reference |
| CBR | Project/specification dependent | Confirm against the applicable contract and current test documentation |
WMM uses a single grading envelope, nominally 0–53mm, per the applicable MoRTH table. Individual fractions are proportioned by trial and error to achieve that gradation — a stockpile of any one fraction is not itself WMM, and grading compliance is checked on the blended, mixed material.
Table numbering for the WMM grading and physical requirements varies across sources and editions (400-8, 400-10, 400-12 and 406.2.1.2 all appear in current references). This page cites Clause 406 as the controlling reference; verify the applicable MoRTH revision and project/contract specification before treating any single table number as the controlling requirement — engineering standards are periodically revised.
Construction requirements referenced under Clause 406: a single compacted layer not less than 75mm, and up to 200mm with vibratory compaction; OMC determined per IS 2720 Part 8; lateral confinement required during laying.
The steps below describe the general WMM production and construction process under Clause 406 — not a claim about which stages OM Group itself performs. OM Group's confirmed role is set out immediately after, in How OM Group Supports WMM Projects.
OM Group manufactures and supplies crushed aggregate materials used across construction and infrastructure applications, from its VSI stone-crushing facility at Banda Wafoli. For WMM projects, OM Group supplies the graded aggregate fractions the specified blend requires — 40mm, 20mm, 10mm, 6mm and screenings — with material matched to the applicable project requirement and MoRTH Clause 406 grading.
OM Group operates its own transport fleet, including tippers and haulers, with operational bases at Kundaim and Thivim in North Goa and Sancoale in South Goa, coordinating aggregate dispatch to site or to a project's wet mix plant as part of a single procurement relationship that can also cover other aggregate grades, GSB, sand and Ready Mix Concrete.
The crushed fractions supplied for WMM blending originate from OM Group's own crushing operation at Banda Wafoli, not a third-party trading relationship.
Material is matched against MoRTH Clause 406 grading and the applicable project/contract specification, rather than treated as an undefined generic aggregate.
40mm, 20mm, 10mm and 6mm fractions are all part of OM Group's crushed stone aggregate range, relevant to a WMM blend's grading requirement.
Road contractors, infrastructure contractors, EPC companies and government contractors can coordinate WMM aggregate alongside other materials on a single procurement relationship.
Base-course aggregate for highway pavement construction, subject to pavement design and project specification.
Base-course supply for rural and urban road construction and rehabilitation.
Base-course aggregate for industrial access roads and logistics-park development.
Site-development and internal road construction, subject to project specification.
Base-course aggregate for broader civil infrastructure and approach-road works.
Any project requiring a specified WMM base course, matched to the applicable grading.
Every application above is subject to pavement design, project specification and engineering approval — this page is a technical reference, not a design substitute.
Before ordering, confirm the following with your engineer or procurement lead:
Send these details to OM Group for a project-specific quotation.
| Product | Wet Mix Macadam (WMM) — crushed, graded aggregate supply |
| Applicable standard (reference) | MoRTH Clause 406, Section 400, plus IRC:109-2015 |
| Grading | 0–53mm envelope, confirmed against the applicable MoRTH table and project contract |
| Aggregate Impact Value | ≤30% — general reference only |
| Los Angeles Abrasion | ≤40% — general reference only |
| Flakiness & elongation (combined) | ≤30% — general reference only |
| Applicable test methods (general reference) | IS 2386 series, IS 2720 (Part 8) |
| Documentation | Available on request, depending on material and project requirement |
| Availability and lead time | Confirmed against project requirement |
WMM aggregate price depends on quantity, grading requirement, delivery location and transportation distance, specification and documentation requirements, current availability and project schedule. No fixed or "starting from" figure is published without a genuine current rate — OM Group quotes against the specific requirement.
Basic
WMM (Wet Mix Macadam) is a pavement base-course material made by mechanically mixing clean, crushed, graded aggregate with controlled water in a wet mix plant, then compacting it into a dense layer, per MoRTH Clause 406.
WMM stands for Wet Mix Macadam.
Wet Mix Macadam is the full name for WMM — a crushed, graded aggregate blend, mixed with controlled water and compacted to form a pavement base course, specified under MoRTH Clause 406 and IRC:109.
WMM is used as the base course in flexible pavements for highways, roads, industrial and infrastructure projects, placed above the granular sub-base (GSB) and below the bituminous or surface layer.
Yes. WMM is generally used as the base course, above the granular sub-base and below the bituminous or concrete surface, subject to the project's pavement design.
Technical
WMM uses a single 0–53mm grading envelope per the applicable MoRTH table. Table numbering varies across sources and revisions, so the specific table and values should be verified against the applicable contract/MoRTH revision.
MoRTH Clause 406, in Section 400 of the Specifications for Road and Bridge Works, is the principal Indian reference governing WMM production, grading and construction requirements.
IRC:109-2015 is the Indian Roads Congress guideline for Wet Mix Macadam, covering design and construction guidance alongside MoRTH Clause 406.
A general standard requirement of ≤30% is cited under MoRTH Clause 406 — stricter than WBM. This is a specification reference, not an OM Group test result for a specific consignment.
A general standard requirement of ≤40% is cited under MoRTH Clause 406. This is a specification reference, not a claim about a specific tested consignment.
A general standard requirement of ≤30% combined flakiness and elongation index is cited under MoRTH Clause 406.
A general standard requirement of ≤6, for the fraction passing 425 micron, is cited under MoRTH Clause 406.
A single compacted WMM layer is generally not less than 75mm, and up to 200mm with vibratory compaction, per Clause 406 — confirm against the project's pavement design.
WMM is compacted after mixing and spreading, with lateral confinement during laying and moisture controlled near the Optimum Moisture Content (OMC) determined per IS 2720 Part 8.
Moisture content close to OMC is what allows the material to reach its target compacted density — placement too wet or too dry of OMC falls short of the density the pavement design assumes, regardless of grading quality.
Comparison
GSB is the sub-base layer, governed by MoRTH Clause 401; WMM is the base course above it, governed by Clause 406, more rigorously graded and plant-mixed with controlled moisture. They are not interchangeable.
No. WBM (Water Bound Macadam) is the older on-site binding method; WMM is plant-mixed with controlled moisture and forced mixing, and carries a stricter Aggregate Impact Value limit.
No. Crusher-run is an uncontrolled mixed-size crusher output. WMM requires controlled proportioning to the specified grading envelope and controlled moisture mixing — crusher-run does not by itself establish compliance with the WMM specification.
No. 40mm aggregate is one crushed fraction — an input to a WMM blend, not WMM itself. WMM is a blend proportioned to a 0–53mm grading curve, not a single size.
No. GSB and WMM occupy different, specified positions in the pavement structure, governed by different MoRTH clauses. One cannot be substituted for the other without engineering approval.
Not as supplied. Crusher-run must first be proportioned to the Clause 406 grading and mixed with controlled moisture before it meets the WMM specification.
Procurement
OM Group supplies WMM aggregate across North and South Goa, produced at its own crushing operation. Request a quote on this page or contact OM Group directly.
OM Group supplies the crushed, graded aggregate fractions used in WMM production across Goa, as part of its road and infrastructure materials range.
Project location, required quantity, required grading, applicable MoRTH revision/contract specification, aggregate fractions required, delivery schedule and any documentation requirement.
Yes. OM Group supplies aggregate at project volumes and operates its own transport fleet for dispatch across Goa.
Yes. Grading and general specification reference information is available on request, confirmed against the applicable project and MoRTH revision.
Where current test data exists for the specific material and project, it is provided on request. Not every parameter is tested for every shipment.
Quantity, grading requirement, delivery location and transport distance, documentation requirements, current availability and project schedule.
OM Group & Local
OM Group supplies the crushed, graded aggregate used in WMM production, produced at its own crushing operation and matched to the applicable specification. OM Group does not currently claim to operate a wet mix plant or supply ready-to-lay WMM material.
Yes. 40mm, 20mm, 10mm, 6mm and screenings — the fractions a WMM blend requires — are part of OM Group's crushed stone aggregate range.
Across North and South Goa, dispatched from OM Group's own transport bases at Kundaim, Thivim and Sancoale.
Yes. OM Group's crushing operation produces multiple nominal sizes, so the fractions a WMM blend requires can be supplied together or coordinated by proportion.
Yes, WMM aggregate is supplied across North Goa.
Yes, WMM aggregate is supplied across South Goa.
Share your required grading, quantity, project location and specification. OM Group will confirm the appropriate supply requirement and commercial details.