id	keyword
american_scientific_journal-2212	rap
american_scientific_journal-2212	asphalt
american_scientific_journal-2212	stress
american_scientific_journal-2212	research
american_scientific_journal-2212	temperature
american_scientific_journal-2212	factor
american_scientific_journal-2212	intensity
american_scientific_journal-2212	pavement
american_scientific_journal-2212	engineering