Vibration Study for Consolidation of Portland Cement Concrete, Preprint, MLR-95-4, 1997

(1997) Vibration Study for Consolidation of Portland Cement Concrete, Preprint, MLR-95-4, 1997. Transportation, Department of

pdf
Preview
PDF
IADOT_mlr9504preprint_Vibration_Study_Consolidation_PCC_1997.pdf

File Size:1MB

Abstract

The Iowa Department of Transportation has discovered an increase in the occurrence of excessively vibrated portland cement concrete (PCC) pavements. The overconsolidation of PCC pavements has been observed in several projects across the state. Overconsolidation is also believed to be a factor in acceleration of premature deterioration of at least two pavement projects in Iowa. To address the problem, a research project in 1995 documented the vibratory practices of PCC slipform paving in Iowa in order to determine the effect of vibration on consolidation and air content of pavement. Paver speed, vibrator frequency, and air content relative to the location of the vibrator were studied. The study concluded that the Iowa Department of Transportation specification of 5,000 to 8,000 vibrations per minute (vpm) for slipform pavers is effective for normal paver speeds on the three projects that were examined. Excessive vibration was clearly identified on one project where a vibrator frequency of 12,000 vpm was discovered. When the paver speed was reduced to half the normal speed, hard air contents indicate that excessive vibration was beginning to occur in the localized area immediately surrounding the vibrator at a frequency of 8,000 vpm. The study also indicates that the radius of influence of the vibrators is smaller than has been claimed.

Item Type: Departmental Report
Keywords: Air voids, Concrete pavements, Deterioration, Overconsolidation, Pavement performance, Pavers, Paving, Slip form paving, Vibration
Subjects: Transportation > Pavements
Transportation > Pavements > Concrete
Transportation
Transportation > Materials
Transportation > Roads and highways
Transportation > Design and Construction
ID Code: 17179
Deposited By: Iowa DOT Library
Deposited On: 10 Jun 2014 15:36
Last Modified: 26 Jan 2015 12:40
URI: http://publications.iowa.gov/id/eprint/17179