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Impact of Repair on Deterioration Profile

For sections that have data from at least 4 inspections and have been repaired, the impact of repair on deterioration profile is investigated. As seen in Figure 3, this analysis is carried out with respect to when the repair was done, i.e. before the third inspections or the fourth inspection. As an example, the solid line shows the average gauge for inspection points that were repaired before the forth inspection. According to this line, due to a repair, the average gauge for this group of curves drops from 5.8 mm in the third inspection to 2.9 mm in the fourth inspection. This yields an almost 50% improvement, which is consistent with the “Repaired before third inspection” group (drop from 8.0 mm to 4.4 mm which is also around 50% improvement).

Another insight from the graph below is that post-repair degradation rate is greater than pre-repair degradation rate. According to the “Repaired before Third Inspection” line, the degradation rate is around 0.1 mm per month (from 7.3 mm

Figure 3. Impact of repair on degradation of curves: Relationship between “Gauge Value Change per Month ” and “Rail Profile ”

to 8.0 mm in 7 months) whereas it is around 0.3 mm per month (from 4.4 mm to 6.7 mm in 7 months) after repair which is three times higher than the pre-repair rate.

 
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