Marshall Stability Test Apparatus

About Marshall Stability Test Apparatus

A Marshall Stability Test Apparatus is a laboratory equipment used to determine the stability and flow value of bituminous (asphalt) mixtures. It evaluates the maximum load-carrying capacity and resistance to plastic deformation of compacted specimens, which is essential for designing durable road pavements.

This apparatus is widely used in highway engineering labs, construction companies, and quality control departments for mix design and performance analysis of asphalt materials.

Key Features

• Motorized load frame with high load capacity (up to 50 kN)
• Constant loading rate of 50.8 mm/min for accurate results
• Equipped with flow measurement dial gauge
• Robust mild steel construction with long service life
• Safety cut-off switch and limit controls
• Compatible with ASTM, AASHTO, and IS standards

Technical Specifications (Typical)

• Load Capacity: 5000 kgf / 50 kN
• Speed: 50.8 mm/min
• Power Supply: 220230V, Single Phase
• Temperature Condition: Test conducted at 60C
• Specimen Size: Up to 100150 mm diameter
• Automation Grade: Manual / Semi-Automatic / Digital

Working Principle

A compacted bitumen specimen is placed in the testing head and subjected to a gradually increasing load at a constant rate. The maximum load (stability) and deformation (flow value) are recorded. These values help determine the optimum binder content and strength of asphalt mix.

Main Components

• Motorized Load Frame
• Breaking Head Assembly
• Compaction Moulds & Base Plates
• Compaction Hammer & Pedestal
• Flow Meter with Dial Gauge
• Load Transfer Bar and Accessories

Applications

• Bitumen and asphalt testing laboratories
• Road and highway construction projects
• Civil engineering colleges & research labs
• Quality control of paving materials

Advantages

• Ensures accurate mix design for road construction
• Improves pavement strength and durability
• Provides reliable and repeatable test results
• Essential for quality assurance in asphalt works