| dc.description.abstract | Pavement roughness is an important feature of the Surface Services, not only does it affects the comfort of riding in a vehicle, but also shows the durability of the pavement allowing the Directorate General to evaluate the frequencies of pavement maintenance. Nevertheless, to have a more efficient control of pavement conditions, collecting the data of regular pavement roughness testing is required. In addition, the testing techniques in the past wasted more time and human resources compared to the new testing meters. As a result, inertial profilers and intelligent vehicle are generally used nowadays.
In this research, 1D laser is replaced by 2D to examine pavement roughness in order to compare the differences of the results between the two laser rangefinders.
Furthermore, the experimental results can be as well referred to the standards of AASHTO and CNS. Additionally, 2D laser calculates the longitudinal measurements of pavement. In consequence, there are three parameters including profile average rangefinder (PAR), profile peak value (PPV) and profile center value (PCV) defined to be analyzed and see if there is difference among these values.
The results revealed that there is non-significant difference among these values. On account of the definition of roughness calculating formula is macroscopic so that the micro-gap in elevation can’’t make too much difference.
According to the standards of AASHTO and CNS, examining pavement roughness by 2D laser suggested no dissimilarity with reference profiling devices, such as Australian Road Research Board Walking Profiler, level Instrument, 1D laser Inertial profiler and International Roughness Index (IRI).
Likewise, the repeatability of 2D laser was evaluated by computing the Average Cross Correlation (ACC) (IRI filtered) and the result is highly positive correlation with other devices. It is also no significant different from the result of other devices in Root Mean Square (RMS). Thus 2D laser can be equipped with inertial profilers.
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