Contact us
 |
[email protected] |
 |
3275638434 |
 |
 |
| Paper Publishing WeChat |
Useful Links
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Effect of Sample Unit Size on Visually Examining Pavement Condition for Asphalt-Surfaced Roads
Author(s)
Bishnu Prasad Devkota
Full-Text PDF
XML 1744 Views
DOI:10.17265/1934-7359/2017.07.007
Affiliation(s)
Nepal Engineering College, Pokhara University, Kathmandu 44600, Nepal
ABSTRACT
Road surface condition evaluation involves the collection of data over
pavement surface for different types of distresses. The exercise consumes a lot
of resources if the whole road section length is surveyed and may be prone to
errors as a result of surveyors’ fatigue. It is
therefore important to develop a representative sample to be used when
evaluating road condition manually. This study aimed at determining an adequate
sample size for section level as well as a way forward for network level
condition evaluation of highways in Nepal. Again the study was conducted to
quantify the effects of altering the sample unit size for performing a distress
survey according to the PCI (pavement condition index) and SDI (surface
distress index) method separately for asphalt surfaced roads. The effect of
reducing/increasing sample unit size was investigated adopting visual
examination through field survey by eight teams in July, 2015, along the section of
Banepa-Bardibas highway. The PCI was then calculated for each sample unit using
standard deduct curves and PCI calculation methodology as per SHRP (Strategic Highway
Research Program) recommendations and the computation of SDI was done as per
DoR (Department of
Roads) guidelines. The
results show that 13% sample unit are needed for SDI and 21% for PCI
computation, however, the results are out
of the significant level. This is higher than DoR and SHRP guidelines. Again no strong
relationship is observed between SDI and PCI values.
KEYWORDS
Pavement condition evaluation, PCI, SDI, sample size, policy implications.
Cite this paper
References