00819977

Component

https://doi.org/10.3141/1755-16

http://scholar.google.com...eson&publication_year=2001

Long-term performance monitoring was conducted on a demonstration project in which road base materials were constructed from reclaimed hydrated fly ash (HFA) and atmospheric fluidized-bed combustion (AFBC) and cement-kiln dust (CKD) by-products were used as calcium activators. Reclaimed HFA is a form of artificial aggregate produced from compacted, hydrated Class C fly ash at pulverized-coal combustion facilities. Strength testing and chemical analysis indicate that AFBC and CKD activators increase cementitious and pozzolanic reactions in the HFA material. Laboratory analysis determined the preferable range of activator to HFA artificial aggregate ratios for AFBC- and CKD-activated mixtures based on strength development, freeze-thaw durability analysis, compaction characteristics, and optimum moisture content ranges. Results of long-term strength gain from core samples show significant strength increase in the CKD-stabilized HFA base mixture, while the AFBC-stabilized HFA mixture shows signs of freeze-thaw durability problems compared with satisfactory performance experienced in the laboratory with the standard for fly ash for use with lime (ASTM C593). It appears that the AFBC section is still performing well but is probably functioning as a flexible aggregate base rather than a stabilized and cemented semirigid base. Long-term testing indicates that the high-volume application of these by-products is an economical and suitable alternative when used with an appropriate calcium activator.

This paper appears in Transportation Research Record No. 1755, Geology and Properties of Earth Materials 2001.

English

p. 151-159

2001

Transportation Research Record

0309072166

Figures (6) ; Photos (4) ; References (17) ; Tables (3)

Base course (Pavements); Compaction; Core samples; Demonstration projects; Fly ash; Freeze thaw durability; Kiln dust; Laboratory tests; Moisture content; Monitoring; Performance; Strength of materials

Atmospheric fluidized-bed combustion; Calcium activators

Geotechnology; Highways; Materials; I33: Other Materials used in Pavement Layers

TRIS, TRB, ATRI

Nov 8 2001 12:00AM

• ADSORPTION AND DESORPTION CAPACITY OF TRICHLOROETHYLENE ON GLACIAL TILL WITH HIGH-PERCENT FINES
• AUTOMATED MEASUREMENT OF TOTAL SUCTION CHARACTERISTICS IN HIGH-SUCTION RANGE: APPLICATION TO ASSESSMENT OF SWELLING POTENTIAL
• DEVELOPMENT OF DATABASE FOR LOUISIANA HIGHWAY BRIDGE-SCOUR DATA
• ENVIRONMENTAL DETERIORATION MODEL FOR FLEXIBLE PAVEMENT DESIGN: AN ONTARIO EXAMPLE
• EVALUATING MOISTURE SENSORS AND MONITORING SEASONAL MOISTURE VARIATION IN LOW-VOLUME ROADS
• FORMAT FOR GEOTECHNICAL DATA EXCHANGE IN THE UNITED KINGDOM
• GEOGRAPHIC INFORMATION SYSTEM-BASED EVALUATION OF GEOTECHNICAL BOREHOLE LOG QUALITY
• IMPLEMENTATION OF MINIATURE CONE PENETROMETER IN ROADWAY DESIGN AND CONSTRUCTION
• INFLUENCE OF HIGHWAY RUNOFF CHEMISTRY, HYDROLOGY, AND RESIDENCE TIME ON NONEQUILIBRIUM PARTITIONING OF HEAVY METALS: IMPLICATIONS FOR TREATMENT AT THE HIGHWAY SHOULDER
• INTEGRATING SEISMIC AND DEFLECTION METHODS TO ESTIMATE PAVEMENT MODULI
• PREDICTION OF WINTER ROUGHNESS BASED ON ANALYSIS OF SUBGRADE SOIL VARIABILITY
• PROTOTYPE TIRE-SHRED EMBANKMENT CONSTRUCTION
• QUALITY ASSESSMENT DURING ROAD FORMATION AND FOUNDATION CONSTRUCTION: USE OF FALLING-WEIGHT DEFLECTOMETER AND LIGHT DROP WEIGHT
• REAL-TIME EVALUATION OF SITE CHARACTERIZATION TO DIRECT AND CONCLUDE EXPLORATION
• SHEAR STRENGTH OF LARGE-SIZE SHREDDED SCRAP TIRES
• USER QUERY INTERFACE FOR THE DEEP-FOUNDATIONS LOAD-TEST DATABASE
• WETTING-INDUCED SETTLEMENT OF COMPACTED-FILL EMBANKMENTS