01024515

Component

https://doi.org/10.3141/1952-03

http://scholar.google.com...hrie&publication_year=2006

The purpose of this research was to characterize both demolition and haul-back sources of recycled concrete material (RCM) available in Utah County, Utah, for use as pavement base material and to investigate the self-cementing behaviors of each. A telephone survey was conducted to assess the state of the practice with respect to the local use of RCM, and extensive laboratory testing was performed to evaluate the strength and durability properties of both sources of RCM. Laboratory testing included determinations of particle-size distributions, Atterberg limits, specific gravity values, absorption characteristics, moisture–density relationships, California bearing ratio (CBR), unconfined compressive strength (UCS), stiffness, resistance to freeze–thaw cycling, tube suction test (TST) moisture susceptibility classifications, and Los Angeles abrasion losses. The results of the testing indicate that marked stiffening and strength gain of the materials occur within a 7-day curing period, although the rate and extent of the increases are dependent on the material source. The higher fines content of the haul-back material corresponded to higher absorption, optimum moisture content, maximum dry density, CBR, UCS, and stiffness values compared with the demolition material, presumably because of the exposure of greater quantities of unhydrated cement in the production of the haul-back RCM. However, the haul-back RCM was characterized by a greater loss in stiffness after freeze–thaw cycling and received a marginal moisture-susceptibility rating in the TST, while the demolition RCM was rated as non-moisture-susceptible. Further research is needed to more definitively investigate the self-cementing mechanism of RCM.

01032925

English

pp 21-27

2006

Transportation Research Record: Journal of the Transportation Research Board

0309099617

Print

Figures (7) ; Photos (2) ; References (27)

Abrasion resistance; Absorption; Atterberg limits; Base course (Pavements); California bearing ratio; Compressive strength; Dry density; Durability; Laboratory tests; Moisture content; Specific gravity; State of the practice; Stiffness; Swelling index; Tube suction test

Freeze thaw cycles; Moisture susceptibility; Particle size distributions; Recycled concrete; Self cementing

Utah

Geotechnology; Highways; I36: Aggregates

PRP, TRIS, TRB, ATRI

Mar 3 2006 10:52AM

• Aggregate Morphology Affecting Resilient Behavior of Unbound Granular Materials
• Assessing the Quality of Soils Modified with Lime Kiln Dust: Measuring Electrical Conductivity with Time Domain Reflectometry
• Development of Cement-Treated Base Material for Reducing Shrinkage Cracks
• Effect of Aggregate Gradation, Mineral Fillers, Bitumen Grade, and Source on Mechanical Properties of Foamed Bitumen-Stabilized Mixes
• Evaluation of Chemically Stabilized Clay Soil Embankments with Accelerated Pavement Testing
• Evaluation of Test Equipment for Determination of Fine Aggregate Specific Gravity and Absorption
• Field Validation of Airport Pavement Granular Layer Rutting Predictions
• Full-Scale Accelerated Testing of Flexible Pavements Made of Coal Combustion Products
• Georgia’s Use of Cement-Stabilized Reclaimed Base in Full-Depth Reclamation
• Laboratory Assessment of Coarse Granular Road Foundation Materials
• Performance Evaluation and Numerical Modeling of Embankment over Soft Clayey Soil Improved with Chemico-Pile
• Permanent Deformation in Flexible Pavements with Unbound Base Courses
• Recommendations for Stabilization of High-Sulfate Soils in Texas
• Selection of Optimum Gravel Aggregate Size to Resist Permanent Deformation in Hot-Mix Asphalt