2. Quantification of Benefits due to Pavement Preventive Maintenance Strategies
Date of Start

August 2005
Indian Institute of Technology Madras, Chennai (R)


Scope and Objectives

The present study is aimed to quantify the benefits of timely preventive maintenance. The data on road geometrics, pavement conditions, roughness, deflection and traffic are collected for a typical state highway and a National Highway. The structural and functional conditions need of the sections were evaluated. The short term and long term cost effectiveness are calculated for various preventive maintenance strategies. The optimal timing of preventive maintenance and the effects of benefit cutoff values for various preventive maintenance strategies for a typical pavement section is computed. The main objectives of the present study are to-

• Quantify the benefits due to application of various preventive maintenance techniques

• Evaluate the short term and long term effectiveness of the preventive maintenance techniques for the pavement sections

• Quantify the effect of benefit cut-off values for different preventive maintenance techniques

• Decide the optimal timing for the application of preventive maintenance techniques

(i) Review of literature and identification of lacuna in research by analysis of data viz. traffic, Benkelman beam deflection, roughness survey and pavement condition

(ii) Ranking and homogenization of pavement sections of the study stretch based on structural and functional condition data

(iii) Performance prediction using appropriate deterioration models

(iv) Quantification of benefits and calculation of effectiveness of typical preventive maintenance strategies over the service life of the pavement by cost-effectiveness index and by road user cost

(v) Evaluating the effect of benefit cut-off values on preventive maintenance treatments

(vi) Computation of the optimal timing of the preventive maintenance strategies
Findings and Conclusions

(i) The life of the pavement can be extended by the application of appropriate preventive maintenance treatments.

(ii) The optimal timing for the application of preventive maintenance treatment varies with the type of treatment and the volume of traffic.

(iii) The benefit cut off factor has major impact on the cost effectiveness of the treatment. It can be seen from the analysis that maintaining the pavement too early or too late is not beneficial. From the analysis the benefit cut-off value for roughness of 2500 mm/km has the maximum benefit.

(iv) As the initial deflection value increases from 0.4 mm to 0.6 mm the do-nothing service life of the pavement decreases from 6 years to 5 years for National Highway section.

(v) Thin overlay preventive maintenance strategy is most cost effective for highways carrying traffic from 5000 cvpd to 6000 cvpd.

(vi) The benefits per unit agency cost for different preventive maintenance treatment depends on the trigger point of the functional parameters and the cost of the treatment.

(vii) The ranking of treatment obtained from road user cost method and cost-effectiveness method ( calculating area under the curve) are almost same.