I. Highway Planning, Management, Performance Evaluation & Instrumentation

4. INSTRUMENTATION AND MICRO-PROCESSOR APPLICATIONS

A. COMPLETED PROJECTS
1. Design and Fabrication of Road Condition Evaluation Equipment for A.P. Govt.
Duration:
July 2002 to 2005
(i) Central Road Research Institute, New Delhi (R, I)
(ii) PWD, Govt. of AP (S)

 

Present Status and progress
Road and Building Department, Govt. of Andhra Pradesh desired to procure Road Condition Evaluation Equipment from CRRI for an amount of Rs. 20.27 lakhs for collecting various types of Road condition data. Road Condition Evaluation Equipment is capable of on-board measurement of road geometrics and surface characteristics of road pavement for collection of information towards pavement maintenance, rehabilitation and reconstruction and to generate programme of works and corresponding budgets.

In continuation of the work reported last year, Road Condition Evaluation Equipment has been validated. Axle Mounted Roughness Measuring Device installed in the Maruti van has been calibrated. The equipment fitted Maruti Van has been delivered to the client. Engineers of R & B Department, Govt. of Andhra Pradesh, have been trained in operation and maintenance of Road Condition Evaluation Equipment.
 
Findings / Conclusions
Calibration of Axle Mounted Roughness Measuring Device

The Axle Mounted Roughness Measuring Device has been calibrated by recording its response and comparing the same with that of Dipstick for different sections having a wide range of roughness varying from very smooth to very poor. For calibration purpose Axle Mounted Roughness Measuring Device installed in the Maruti car was run at a speed of 30 km/hr.

The roughness data for the test sections collected using Axle Mounted Roughness Measuring Device was recorded in mm/km. The Dipstick data was recorded in terms of IRI (International Roughness Index) for the same test sections and then converted to mm/km using the formula: converted roughness = 720*IRI. Based on the data the calibration equation developed between Axle Mounted Roughness Measuring Device at 30 km/hr speed and converted roughness values from Dipstick (IRI) data is presented below:

Calibration equation: Y = 1.0869 X + 833.55 ............................(1)
R2= 0.9578 ............................(2)

X = Roughness as measured by Axle Mounted Roughness Measuring Device at 30 km/hr speed
Y= Converted roughness in mm/km from IRI values of Dipstick
 
Reports / Publications
Final report submitted to A.P.Govt. along with the van equipped with equipments.