Abstract
The Iowa Department of Transportation specified use of vibrator monitors on paving machines in 1999, and current specifications require the use of vibrator monitors on pavers for projects of 50,000 sq yd or more. Use of monitors has provided appropriate control of vibrators and has eliminated trails of segregated, low-air content, deterioration-prone concrete. The vibrator monitors record and display data such as vibrator frequency, paver location, travel speed, and air temperature for all vibrators at all times. The vibrator monitors improve portland concrete cement pavement quality and reduce deterioration, while reducing maintenance time and costs.