BENKELMAN BEAM
HT-730 & HT-730-AN
Reference Standards: IRC 81
The Benkelman Beam is used for measuring the rebound deflection of flexible pavements under standard loading conditions. The test evaluates the structural capacity of pavement layers and helps in overlay design.
The apparatus works on the lever principle. When a loaded truck passes over the test point, the pavement deflects, and the beam records this movement through a dial gauge. The rebound deflection is used to assess pavement strength and remaining life.
It is widely used in highway engineering for maintenance planning and structural evaluation.
Key Features
- High precision dial gauge
- Lightweight and portable design
- Lever mechanism for magnification
- Easy field operation
- Durable construction
Technical Specifications
- Beam ratio: 2:1
- Length: Approx. 3.66 m
- Operation: Manual
Ordering Information
HT-730 Benkelman Beam with Digital Dial Gauge in Wooden Carrying Case (as per IRC:81)
HT-730-AN Benkelman Beam with Analog Dial Gauge in Wooden Carrying Case (as per IRC:81)
Note: Machine supplied with NABL accredited calibration certificates.
Straight Edge (3 Meters)
A straight edge approximately 3 meters in length may be used to determine lateral surface regularity of a road surface. This lightweight apparatus is made up of mild steel or aluminum as per customers requirement and is equally supported at both ends producing a set height between the road surface & the beam. Any vertical irregularity is measured using incremented wedges.
Travelling Beam Device
The Travelling Beam Device is used to check for any irregularities in both concrete and bituminous road surfaces. A sensing unit comprising a wheel connected to an indicator provides a magnification of 4:1. Deviation of the surface from a straight-line is shown on a scale calibrated in increments of 2 mm in the 0-10 mm range and 5 mm increments in the 10-25 mm range. It comprises a manual dye marker which is used to mark irregular surface sections when found.
