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Title:

Evaluation of Prima Light Falling-Weight Deflectometer as Quality Control Tool for Compaction of Fine Grained Soils

Accession Number:

01045584

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

Compaction of embankment soils is a key factor influencing premature pavement distresses. The current specifications of the Kansas Department of Transportation (KDOT) address embankment compaction in terms of density and moisture content. However, the implementation of performance based specifications would require measuring in situ stiffness, in addition to density, because soil stiffness is the parameter employes when pavement structures designed. The investigated the use of the Prima 100 Light Falling Weight Deflectometer (L-FWD) to measure in-situ soil stiffness and the feasibility of developing a stiffness based specification for embankment soil compaction quality control that uses the L-FWD measured stiffness. To achieve the objectives, soil stiffness values were measured at multiple locations along eight KDOT embankment projects using the Prima L-FWD. Concurrent density and moisture measurements were also taken at select locations. Laboratory resilient moduli tests were performed on remolded soil samples at several density and moisture contents. For each soil, regression models were derived from the laboratory resilient modulus data to predict the in-situ modulus. It was found that the predicted in-situ resilient moduli did not correlate with the in-situ measured moduli. Therefore, it was not possible to develop a quality control scheme for embankment soil stiffness that employs stiffness requirements established based on the results of laboratory resilient modulus tests. In addition, the testing proved that the in-situ modulus of fine grained soils has a high degree of spatial variability. This prevented the development of a quality control procedure based on stiffness measured on a control test strip.

Monograph Accession #:

01042056

Report/Paper Numbers:

07-1326

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Petersen, James S
Romanoschi, Stefan A
Onyango, Mbakisya A
Hossain, Mustaque

Pagination:

23p

Publication Date:

2007

Conference:

Transportation Research Board 86th Annual Meeting

Location: Washington DC, United States
Date: 2007-1-21 to 2007-1-25
Sponsors: Transportation Research Board

Media Type:

CD-ROM

Features:

Figures; Photos; References (7) ; Tables (1)

Uncontrolled Terms:

Premature failure

Subject Areas:

Design; Geotechnology; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I33: Other Materials used in Pavement Layers

Source Data:

Transportation Research Board Annual Meeting 2007 Paper #07-1326

Files:

TRIS, TRB

Created Date:

Feb 8 2007 5:55PM