00348711

Component

http://onlinepubs.trb.org...s/trr/1981/821/821-017.pdf

https://scholar.google.co...nnon&publication_year=1981

The design, construction, and evaluation of a prototype automated vehicle-carried nuclear moisture-density backscatter gage are described. Gage development was based on research and analysis concerning several factors that affect gage performance. This research indicated that the prototype backscatter-gage measurements were approximately equivalent to measurements obtained by commercial transmission gages. The implication of this research finding is the possibility of a backscatter test method as a valid, reliable, and expedient procedure for determining in situ soil conditions. Field comparisons between the prototype gage and a commercial nuclear backscatter gage demonstrated a marked improvement in performance by the prototype gage. The prototype gage is installed in a motor vehicle together with a hydraulically operated mechanism that automatically positions the gage for testing. The vehicle gage unit, or Autoprobe, can determine in situ moisture and density values in 3 min. The Autoprobe is now ready for use by the California Department of Transportation for investigational and quality-control purposes. (Authors)

Publication of this paper sponsored by Committee on Instrumentation Principles and Applications. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01411629

pp 94-101

1981

Transportation Research Record

60th Annual Meeting of the Transportation Research Board

0309032638

Print

Figures (6) ; Photos (3) ; References (4) ; Tables (3)

Field tests; Measuring instruments; Nuclear tests; Personnel management; Soils

Administration and Management; Geotechnology; Highways; Materials; I42: Soil Mechanics

TRIS, TRB

Jun 30 1982 12:00AM

• ANALYSIS AND REPAIR OF WATER-DAMAGED BITUMINOUS PAVEMENT
• ASPHALT MIXTURES: COMPARATIVE ANALYSIS OF CHARACTERIZATION FOR DESIGN
• BEHAVIOR AND REPAIR OF DETERIORATED REINFORCED CONCRETE BEAMS
• CHARACTERISTICS AND PERFORMANCE OF ASPHALT-RUBBER MATERIAL CONTAINING A BLEND OF RECLAIM AND CRUMB RUBBER
• DESIGN FOR MINIMIZING DETRIMENTAL VIBRATIONS FROM CONSTRUCTION BLASTS
• DEVELOPMENT OF A CONSTRUCTION PRICE INDEX FOR MAJOR PUBLIC TRANSIT INVESTMENT PLANNING
• EFFECT OF AGGREGATE TOP SIZE ON ASPHALT EMULSION MIXTURE PROPERTIES
• MAGNITUDE OF HORIZONTAL MOVEMENT IN JOINTED CONCRETE PAVEMENTS
• MODIFICATION OF PAVING ASPHALTS BY DIGESTION WITH SCRAP RUBBER
• NONDESTRUCTIVE MONITORING OF CHLORIDE IN BRIDGE DECKS WITH A MOBILE NEUTRON-GAMMA SPECTROMETER
• OVERVIEW OF PAY-ADJUSTMENT FACTORS FOR ASPHALT CONCRETE MIXTURES
• PERFORMANCE COMPARISON BETWEEN A CONVENTIONAL OVERLAY AND A HEATER-SCARIFICATION OVERLAY
• PERFORMANCE OF OPEN-GRADED ASPHALTIC CONCRETE FRICTION COURSES IN ARIZONA
• RATIONAL APPROACH TO DESIGN OF BITUMINOUS STOCKPILE PATCHING MIXTURES
• REPAIR OF TORSIONALLY INADEQUATE CONCRETE BEAMS BY USE OF ADHESIVELY BONDED PLATES (ABRIDGMENT)
• TEXTURING OF CEMENT CONCRETE PAVEMENTS BY CHIP SPRINKLING THE FRESH CONCRETE