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Title:

VIBRATION STUDY FOR CONSOLIDATION OF PORTLAND CEMENT CONCRETE

Accession Number:

00740646

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309059739

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.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1574, Advances in Concrete and Concrete Pavement Construction.

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Tymkowicz, S
Steffes, R F

Pagination:

p. 109-115

Publication Date:

1997

Serial:

Transportation Research Record

Issue Number: 1574
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309059739

Features:

Figures (4) ; Photos (9) ; References (4) ; Tables (2)

Old TRIS Terms:

Subject Areas:

Construction; Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I52: Construction of Pavements and Surfacings

Files:

TRIS, TRB, ATRI

Created Date:

Sep 8 1997 12:00AM

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