01333193

Component

https://doi.org/10.3141/2253-02

http://scholar.google.com...+Ooi&publication_year=2011

With a rise in virgin aggregate consumption, the use of recycled materials has become an attractive solution in earthwork and pavement construction. An understanding of the behavior and characteristics of recycled materials is necessary before they are used in practice. In this study, the behavior of recycled concrete aggregate (RCA) during compaction in a 3-ft-diameter cross-linked polyethylene bin was examined. The main objectives of this experiment were to (a) determine the applicability of the nuclear gauge and time domain reflectometry for measuring the dry density and moisture content of RCA, (b) measure the stiffness of the RCA with a portable falling weight deflectometer and GeoGauge, (c) estimate the compaction-induced lateral pressures of the RCA, and (d) assess the variation in moisture content, dry density, and stiffness of the RCA over a 2-month postcompaction period. Measurements were taken immediately after each lift was compacted and again over the postcompaction period. Highlights of the study findings include (a) the nuclear gauge provided higher moisture content values than the oven-measured values, which suggested a need for moisture offsets; (b) the zone of influence must be considered in the interpretation of portable falling weight deflectometer and GeoGauge moduli; and (c) compaction significantly increased the locked-in lateral stress from its normally consolidated at-rest value. In the postcompaction phase of the experiment, there was evidence that additional pozzolanic reaction occurred in the RCA, followed by shrinkage cracks.

01358796

11-2176

English

pp 10-21

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309222891

Print

Figures (8) ; Photos (5) ; References (24) ; Tables (2)

Compactibility; Dry density; Falling weight deflectometers; Geotechnical engineering; Moisture content; Nuclear gages; Recycled materials; Stiffness; Time domain reflectometers

GeoGauge

Recycled concrete aggregate

Geotechnology; Highways; Materials; I36: Aggregates

PRP, TRIS, TRB, ATRI

Feb 17 2011 6:05PM

• Assessment of Corrosion Potential of Coarse Backfill Aggregates for Mechanically Stabilized Earth Walls
• Early-Age Structural Properties of Base Material Treated with Asphalt Emulsion (With Discussion and Closure)
• Experimental and Numerical Evaluation of Stabilization Effect on Pollutant Mobility from Incinerator Bottom Ash Waste
• Forensic Investigation of Distressed Pavement Supported on a Base Course Containing Recycled Concrete Aggregate
• Performance of Continuously Reinforced Concrete Pavement Containing Recycled Concrete Aggregates
• Reliability-Based Design of Mechanically Stabilized Earth: Fill Properties and Variable Metal Loss
• Time-Dependent Structural Response of Full-Depth Reclamation