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WMM Plant
ROAD CONSTRUCTION

WMM Plant (Wet Mix Macadam)

A specialized, continuous‑flow production system used to produce a homogenous blend of stone aggregates of various sizes, clean sand or stone dust, and a controlled amount of water. This processed cold mix forms the critical base and sub‑base layers of modern highways and runways before asphalt or concrete layers are applied. Unlike asphalt plants, a WMM plant operates entirely cold without any heating elements or bitumen. Capacities from 100 to 300+ TPH.

verified ISO 9001:2015 water_drop Precision Water Control history 20+ Year Lifespan public Exported to 28 Countries

CAPACITY

100–300+ TPH

MIXER TYPE

Twin-Shaft Pugmill

POWER

60–120+ HP

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Overview
Technical Specifications
Features & Benefits
Applications
FAQs

Superior Sub‑Base Material Production

A Wet Mix Macadam (WMM) Plant is a specialized, continuous‑flow production system used to produce a homogenous blend of stone aggregates of various sizes, clean sand or stone dust, and a controlled amount of water. This processed cold mix forms the critical base and sub‑base layers of modern highways and runways before asphalt or concrete layers are applied. Unlike asphalt plants, a WMM plant operates entirely cold without any heating elements or bitumen.

settings Core Technical Specifications

ParameterStandard Industrial Range
Production Capacity100 TPH to 300+ TPH
Aggregate Sizes Handled0 mm to 40 mm (typically split across 4 cold bins)
Water Storage Capacity4,000 Litres to 10,000 Litres (optional)
Mixing Unit TypeTwin‑shaft pug mill
Connected Power Load~60 HP to 120+ HP (depending on TPH capacity)
Control SystemFully automatic PLC‑based panel with variable frequency drives (VFDs)

flowchart Key Components & System Layout

A WMM plant is engineered for high‑volume output and precise aggregate blending. The layout consists of these core assemblies:

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    Cold Aggregate Feeder Bins: Typically features 4 separate bins equipped with adjustable mechanical gates and variable‑speed conveyor drives. This allows operators to meter specific ratios of coarse stones, gravel, and stone dust onto the gathering belt.
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    Vibrating Screen: Placed between the gathering conveyor and the main charging belt. It filters out oversized boulders and debris, ensuring only compliant aggregate sizes enter the mixing zone.
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    Twin‑Shaft Pugmill Mixer: The heart of the plant. It features a heavy‑duty steel trough lined with replaceable wear‑resistant liners. Inside, two counter‑rotating shafts equipped with paddle arms and tips rapidly blend the aggregates while water is injected.
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    Water Tank & Metering System: A centrifugal water pump draws from a storage tank and delivers water through a spray bar inside the pugmill. A digital flow meter precisely controls water addition (usually 4% to 7% by weight) based on the current aggregate feed rate.
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    Control Cabin: An air‑conditioned cabin housing the centralized electric control panel. It features a PLC interface that auto‑calculates and locks aggregate‑to‑water ratios.

inventory_2 Quick Facts

BrandAtlas Engineering
OriginAhmedabad, India
Warranty18 Months
Delivery6–8 Weeks
MixerTwin‑shaft Pugmill
ControlPLC + VFDs
SpecificationDetails
Capacity100 TPH / 150 TPH / 200 TPH / 250 TPH / 300 TPH (custom)
Mixer TypeTwin‑shaft pugmill, continuous
Mixer Capacity1.5–3.5 m³ (effective volume)
Aggregate Bins4 bins (customizable), each 5–15 m³
Aggregate Sizes Handled0–40 mm
Water AdditionPLC‑controlled, variable‑speed pump, ±0.5% accuracy (4–7% by weight)
Water Storage Capacity4,000–10,000 Litres (optional)
Mixing Time30–60 seconds (adjustable via conveyor speed)
Power Requirement60–120+ HP (model dependent)
Control SystemPLC + HMI Touchscreen with VFDs and recipe storage
Aggregate FeedingBelt feeders with variable speed drives
ComplianceIS 8887, MoRTH specifications
FootprintApprox. 40 ft x 25 ft (model dependent)
Net Weight15,000–35,000 kg (model dependent)
precision_manufacturing

Twin‑Shaft Pugmill Mixer

Heavy‑duty twin‑shaft design with replaceable wear liners and mixing paddles for thorough, uniform blending of aggregates and water.

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Precise Water Control

PLC‑controlled water addition system with flow meter and variable‑speed pump ensures optimal moisture content within ±0.5% tolerance.

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Atlas Direct IoT Ready

Optional remote monitoring for production rates, moisture content, and plant performance.

build

Low Maintenance Design

Heavy‑duty construction with easy‑access panels and wear‑resistant components ensures long life and minimal downtime.

settings

Flexible Aggregate Configuration

Customizable 4‑bin aggregate configuration with variable‑speed feeders for precise proportioning of multiple aggregate fractions.

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24/7 Technical Support

On‑site commissioning, training, and spare parts support across 28 countries.

route

Highway & Expressway Bases

Production of high‑quality wet mix macadam for road base and sub‑base layers of national highways and expressways.

construction

Rural & State Road Projects

Cost‑effective WMM production for PMGSY, state highways, and rural connectivity projects.

warehouse

Industrial & Commercial Pavements

Base material for industrial yards, commercial complexes, and parking areas requiring high load‑bearing capacity.

water

Irrigation & Canal Lining

Production of wet mix material for canal lining and irrigation infrastructure where moisture‑controlled compaction is essential.

What is the typical moisture content in WMM?expand_more

The optimal moisture content for WMM ranges from 4% to 7% by weight of aggregates, depending on the aggregate type, gradation, and project specifications. The plant's precision water control system ensures consistent moisture levels.

What is the mixing time per batch?expand_more

The plant operates continuously, but the effective mixing time within the pugmill is typically 30–60 seconds, adjustable via conveyor speed, ensuring thorough homogenization.

Can the plant handle different aggregate gradations?expand_more

Yes, the plant features 4 aggregate bins with variable‑speed feeders, allowing precise proportioning of different aggregate sizes to meet specific mix designs and project requirements.

Is the plant suitable for mobile operations?expand_more

Yes, the plant is available in skid‑mounted configurations for quick relocation and setup at different project sites, making it ideal for multi‑site projects.

What are the typical aggregate sizes used?expand_more

The plant handles aggregates from 0 mm to 40 mm, split across 4 cold bins to ensure proper gradation for base and sub‑base layers.

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