Pavement condition information

Pavement condition information is perhaps the most fundamental of all input data, as it will define the present and future needs for maintenance or rehabilitation works. 

Pavement condition is assessed by pavement condition surveys carried out visually or by the use of appropriate static or mobile devices, measuring functional and structural pavement properties. 

The results of pavement condition surveys are expressed in terms of condition indices. The techniques and means of measuring functional and structural condition of a pavement are discussed in Chapter 15. 

In all cases, survey procedures should be consistent from one survey to another in order for the information gathered to be comparable. 

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After a final decision is made regarding the selection of the improvement program (preventing maintenance, maintenance, rehabilitation or reconstruction), its implementation follows. All information regarding completion dates, changes in pavement condition, materials used and any other construction details are fed back to the PMS database. This will be valuable information for future updates of PMS. 

This report contains the results of one study of long-term performance of recycled HMA pavement. The study in question is a 15 year follow-up survey of one of Japan s earlier (1978) full-scale applications of recycled pavement using recycled HMA to pave municipal roads in Nagoya City. In this pavement test, new HMA was applied at the same time so as to compare it with to the recycled pavement. Both the new and recycled pavements are in good condition even to date, and serve as a source of valuable information about pavement durability. We will also report on the results of our investigation of recycled and re-recycled HMA using asphalt concrete lumps collected at a study site. 

An FWD has the ability to provide information for the structural condition of all pavement layers, including the subgrade. In particular, with FWD deflection measurements, the following may be obtained (a) estimation of modulus of elasticity or stiffness modulus of each layer, (b) estimation of remaining life of pavement, (c) detection of weak points in the pavement, (d) estimation of the severity of potential cracks in stabilised layers, (e) determination of the effectiveness of the load transfer at the joints of rigid pavements and (f) detection of cracks on rigid pavements. 

The history of post-construction works, if carried out, must be known in detail. This provides valuable information on estimating rates of deterioration for locally existent conditions. Initial construction details and history of post-construction works link the differences in pavement performance to pavement structure characteristics. 

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