Standard laboratory apparatus for Marshall bituminous mix design and quality control — mandatory for highway and road pavement work across NE India.
The Marshall Stability Apparatus is the standard laboratory machine used to determine the strength and deformation characteristics of compacted bituminous (asphalt) mix specimens under a controlled vertical load. It consists of a loading frame, a proving ring or load cell, a water bath, and a set of breaking heads that grip the cylindrical mix specimen. The test produces two key values: stability (the maximum load the specimen sustains before failure, in kg) and flow (the deformation at peak load, in mm). Both values together define whether an asphalt mix is too stiff, too soft, or correctly balanced for the design traffic and climate.
In Northeast India — where highway construction is an ongoing priority under NHIDCL, NHAI, and state PWD programmes — Marshall testing is mandatory for every bituminous course before laying begins. Guwahati-based road contractors, material testing labs, and government field quality control units use the Marshall Stability Apparatus routinely on projects spanning Assam's NH-27, the Arunachal Frontier Highway, and district road improvement schemes throughout Meghalaya, Nagaland and Mizoram.
Road contractors and subcontractors are the primary users — they run Marshall tests on trial mixes before the hot-mix plant is calibrated, and then as daily production QC to verify that the day's mix output meets the approval standard. Government quality assurance teams (third-party inspection agencies, PWD material labs) conduct independent tests to verify contractor claims. Engineering colleges and polytechnics across Assam use it in the Transportation Engineering laboratory to give students hands-on exposure to pavement design.
The apparatus pairs naturally with other civil lab equipment from Multi Trade Combines: the penetration test apparatus and softening point apparatus for bitumen characterisation, the Los Angeles abrasion machine for aggregate testing, and the concrete cube mould set and CTM for general civil material QC. A complete bituminous mix design programme uses all of these instruments in sequence before a mix is approved for production.
| Category | Civil Lab Equipment |
|---|---|
| Key specs | Bitumen mix design |
| Standard | IS 73 / MORTH Specification for Road Works |
| Mould diameter | 101.6 mm (standard Marshall mould) |
| Application | Bituminous mix design & QC |
| Availability | In stock — price on request |
The Marshall Stability test determines the load-bearing capacity and flow value of a compacted bituminous mix specimen. Engineers use the result to optimise the asphalt mix design — the ratio of aggregate, bitumen, and filler — before laying a road pavement. IS 73 and MORTH specifications for NE India highway work require Marshall Stability testing at the design stage and during production quality control. A minimum stability value (typically 750 kg to 1500 kg depending on traffic category) must be met before the mix is approved for laying.
The complete Marshall test setup needs the stability frame itself, a proving ring or load cell, a Marshall mould set (101.6 mm diameter), a compaction hammer (4.5 kg, 457 mm drop), a mould holder, a water bath capable of 60°C ± 1°C, a flow meter dial gauge, and a specimen extractor. Multi Trade Combines can supply the complete test set or individual replacement components. Call or WhatsApp us for current availability and specifications.