On-Site

Road Surface Profiler 5051 Mark 11(RSP)

SRT has acquired a Dynatest Road Surface Profiler 5051 Mark 11(RSP) that provides an advanced, automated, high quality pavement roughness and related measurements solution to engineers worldwide. The RSP is capable of real time continuous high-way speed measurements of longitudinal profile (International Roughness Index (IRI), Ride Number, transverse profile, rut depth, macro texture, geometrics (crossfall, curvature and gradient)).

Click here to read more

MK3 : Model Mobile Load Simulator

The Model Mobile Load Simulator was developed in Stellenbosch (South Africa). Originally it was a one tenth scale machine, but subsequently the more versatile one third scale Mk3 was developed for use in the laboratory and in the field.

Click here to read more

Falling Weight Deflectometer

The Falling Weight Deflectometer enables the engineer to determine a deflection basin caused by a controlled load with accuracy and resolution superior to other existing test methods.

The FWD produces a dynamic impulse load that simulates a moving wheel load, rather than a static load. This allows the use of mechanistic based design methods

A non-destructive test device
One man operation
Accurate and fast
Wide load range (7-120 kN)
Excellent repeatability
Ideal for mechanistic/analytical design approaches
Designed for multi-purpose
pavement applications ranging from unpaved roads to airfields
SABS calibrated to SHRP protocol

FWD generated data, combined with layer thickness, can be confidently used to obtain the “in-situ” resilient E-moduli of a pavement structure. This information can in turn be used in a structural analysis to determine the bearing capacity, estimate expected life, and calculate an overlay requirement, if applicable. (over a desired design life)

ARRB Walking Profiler

The ARRB Walking Profiler is a precision instrument designed to facilitate the efficient collection and presentation of continuous paved surface information, including distance, profile, grade and International Roughness Index (IRI).

The Walking Profiler enables accurate recording of measurements for actual profile, grade and level for surfaces such as paved roads, footpaths, runways, building slabs and sporting surfaces.

This compact and easy-to-use device is pushed over the surface to be surveyed. The on-board computer calculates and displays results (graphics and tables). The IRI output from this device meets World Bank Class 1 Profilometry requirements.

The system comes with a basic Footworks software package that provides profile and IRI. An advanced version of the Footworks software is available which provides additional information including straight edge emulation and California Profilograph emulation.

MK1 : Griptester

The Griptester is a three wheeled trailer with a weight of 85 kg. The single measuring wheel is braked by 15% and the load and drag on this wheel are continuously measured. Measuring tyre is ASTM Type A. The friction coefficient (load/drag), known as the GripNumber (GN), is transmitted to a data collection computer held in the cab of the towing vehicle. Manufactured by Findlay Irvine, Scotland since 1988, over 300 Griptester are in use worldwide. The Griptester is the most versatile friction tester available and may easily and economically be used for the investigation of accident sites, for supplementary road surveys and for the survey of whole road networks. It is uniquely suitable for urban road networks. The Griptester is also widely used for the testing of airport runways.

In 1992, the Griptester took part in the International PIARC experiment to “Compare and Harmonise Texture and Skid Resistance measurements” and turned in excellent results. The Griptester is therefor “calibrated” to measure the friction part of the International Friction Index (IFI), should authorities wish to adopt the IFI.

Tests between Griptester and SCRIM at TRL in 1994 showed very good correlation (correlation coefficient of 0.977 obtained).