Automatic Marshall Mechanical Compaction Apparatus
Motorized compaction frame with 4.536 kg sliding drop hammer, 457.2 mm drop height, and rotating base.
Civil Engineering / Marshall Stability & Flow
FREE TO EXPLORELABORATORY 39 · CIVIL ENGINEERING
Marshall Stability and Flow of Compacted Hot-Mix Asphalt (HMA) Pavement Mixtures
Determine Marshall stability (peak compressive resistance) and plastic flow value of cylindrical bituminous paving mixtures compacted at 60°C to design optimum binder content (OBC) according to ASTM D6927 / AASHTO T245. Explore interactive structural mechanics, materials simulation, and civil engineering telemetry.
STRUCTURAL MATERIALS · MECHANICS · GEOTECHNICAL · HYDRAULICS · HIGHWAYS · SURVEYING
Your virtual civil engineering laboratory.
MARSHALL PEAK STABILITY FORCE—
CIVIL INFRASTRUCTURE TELEMETRY
Ready to sample with Binder Content = 5.0 %.
Adjust Binder Content, then execute civil engineering measurement.
Civil engineering telemetry is evaluated rigorously using 64-bit IEEE 754 precision. Residuals reflect ordinary least-squares regression across successive observations. Continuous data structures support high-fidelity structural mechanics and geotechnical continuum modeling.
Civil engineering assumptions and boundary condition limits
The civil engineering physical models apply within the specified calibrated operational window (3.5 to 6.0 %). Tested on dense-graded Superpave 12.5 mm wearing course mixture (75 blows/face compaction, PG 64-22 binder). Linearized response over the build-up range relates stability to binder content with slope 2.8500 kN/%.
Laboratory apparatus & testing equipment.
Cylindrical Steel Marshall Specimen Molds & Collar
Machined steel molds (101.6 mm internal diameter, 88.9 mm height) with detachable baseplate and collar.
Motorized Marshall Loading Frame with Breaking Head
Compression machine driving cylindrical segment breaking jaws at constant rate of 50.8 mm/min up to 50 kN.
Digital Load Cell and Flow LVDT Transducer
Simultaneously records peak load to 0.01 kN and flow deformation to 0.01 mm.
Thermostatic Circulating Water Bath
Maintains 60.0 ± 1.0 °C for 30 to 40 minutes prior to breaking test.
Forced-Draft Electric Mixing Oven
Heats aggregate and bitumen binder to 150 ± 5 °C for laboratory batching and mixing.
FOLLOW THE METHOD
A reason behind every step.
Determine Marshall stability (peak compressive resistance) and plastic flow value of cylindrical bituminous paving mixtures compacted at 60°C to design optimum binder content (OBC) according to ASTM D6927 / AASHTO T245. Standardized parameter settings: 3.5, 4.0, 4.5, 5.0, 5.5, 6.0 %.
01
Aggregate Batching & Thermal Conditioning
Batch coarse aggregate, sand, and mineral filler to target gradation (NMAS 12.5 mm); heat 1200 g aggregate batches in oven at 160 °C for 4 hours; heat PG 64-22 bitumen to 150 °C.
02
Mixing at Target Binder Contents
Add bitumen at target percentages (3.5, 4.0, 4.5, 5.0, 5.5, and 6.0% by total mix weight); mix thoroughly in mechanical mixer at 150 °C until all aggregates are uniformly coated.
03
Hammer Compaction in Cylindrical Mold
Transfer mixture into preheated 101.6 mm mold lined with silicone paper; spade 15 times with hot spatula around perimeter and 10 times in interior; compact with 75 blows per face.
04
Specimen Extrusion & Volumetric Measurement
Cool specimen to room temperature; extrude using hydraulic jack; measure height, dry mass in air, submerged mass in water, and saturated surface dry (SSD) mass to determine bulk specific gravity G_mb.
05
Water Bath Conditioning at 60 °C
Submerge compacted briquettes in thermostatic water bath at 60.0 ± 1.0 °C for exactly 35 minutes prior to testing.
06
Marshall Breaking Test & Parameter Recording
Transfer briquette into pre-warmed Marshall breaking head within 30 seconds; apply compressive displacement at 50.8 mm/min; record maximum load (Stability in kN) and deformation at failure (Flow in mm).
YOUR NOTEBOOK · 0 OBSERVATIONS
Turn measurements into civil engineering insight.
Points are your recorded observations. The solid regression line validates Marshall Stability & Flow mathematical scaling.
LINEAR REGRESSION FIT · y = mx + b
Stability = 2.8500 · P_b
| # | Bitumen Binder Content P_b (%) | Marshall Peak Stability Force (kN) | Bitumen binder content P_b (%) | Marshall peak compressive stability (kN) | Remove |
|---|
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CHECK YOUR UNDERSTANDING
Explain what the civil engineering metrics mean.
The standard water bath temperature for conditioning Marshall asphalt specimens prior to breaking is:
The constant rate of vertical compressive deformation in the Marshall testing machine is:
For heavy traffic Category 1 highways, the minimum specified Marshall Stability is typically:
In compacted hot-mix asphalt (HMA), the design target percentage of air voids (Va) is typically:
THEORY AND STRUCTURAL CONTEXT
Civil engineering background & physical principles.
In civil transportation highway pavement engineering, Hot-Mix Asphalt (HMA) is the primary surfacing material for flexible pavements, carrying millions of equivalent single axle loads (ESALs) over design lifespans. Developed by Bruce Marshall in the 1940s and standardized under ASTM D6927 / AASHTO T245, the Marshall Mix Design method establishes the Optimum Binder Content (OBC) that balances structural stability, durability, fatigue resistance, and skid resistance. Asphalt concrete specimens (101.6 mm diameter, 63.5 mm height) are batched with mineral aggregate blends and varying asphalt binder contents (e.g. 3.5% to 6.0% by total mix mass), heated to 145–150 °C, and compacted in a preheated cylindrical steel mold using a 4.536 kg sliding drop hammer falling 457.2 mm (applying 50 or 75 blows per face for medium or heavy traffic). Compacted briquettes are conditioned in a thermostatic water bath at 60.0 ± 1.0 °C for 30 to 40 minutes (simulating extreme summer pavement surface temperatures) and sheared in a Marshall breaking head at a constant deformation rate of 50.8 mm/min (2.0 in/min). Two fundamental parameters are recorded: (1) Marshall Stability: the maximum compressive load (kN) sustained before plastic failure; and (2) Marshall Flow: the total plastic deformation (in units of 0.25 mm or mm) recorded at the instant peak load is reached. In this laboratory investigation, stability response across binder contents from 3.5% to 6.0% is evaluated to calibrate mix stiffness sensitivity slope = 2.8500 kN/% (yielding peak stability = 14.25 kN at 5.0% bitumen).
Stability = 2.8500 · P_b
Tested on dense-graded Superpave 12.5 mm wearing course mixture (75 blows/face compaction, PG 64-22 binder). Linearized response over the build-up range relates stability to binder content with slope 2.8500 kN/%.