00968530

Component

https://doi.org/10.3141/1861-04

http://scholar.google.com...oley&publication_year=2003

Tender hot-mix asphalt mixtures have been observed and experienced by paving contractors for many years. However, during the field compaction of coarse-graded Superpave (registered trademark) mixes, a tender zone, not a true tender mix, is sometimes experienced. The tender zone is a range of mix compaction temperatures during which the mixture exhibits instability during roller action. Many possible causes of the tender zone have been presented, including differences in laboratory and production absorption, mix moisture, a low dust-to-asphalt ratio, increased asphalt binder film thickness, and a temperature differential with the lift. A study was conducted to document and evaluate field mixtures exhibiting the tender zone to determine the possible cause(s) of its occurrence. Documentation included mix-, production-, and construction-related items. Laboratory evaluation consisted of mixture gradation and volumetric testing along with Superpave asphalt binder testing with the project asphalt binder before and after steam distillation. Project results failed to clearly identify one particular reason for the occurrence of the tender zone. However, it is believed that the tender zone was a result of field absorption being less than the design absorption and increased asphalt binder film thickness acting in conjunction with an inherent temperature differential within the lift.

This paper appears in Transportation Research Record No. 1861, Construction 2003.

English

p. 29-36

2003

Transportation Research Record

0309085985

Figures (2) ; References (7) ; Tables (3)

Absorption; Asphalt mixtures; Bituminous binders; Compaction; Field studies; Hot mix asphalt; Laboratory studies; Superpave

Film thickness; Temperature differential; Tender mixes

Construction; Highways; I52: Construction of Pavements and Surfacings

TRIS, TRB

Jan 9 2004 12:00AM

• APPLICATION OF INFRARED IMAGING AND GROUND-PENETRATING RADAR TO DETECT SEGREGATION IN HOT-MIX ASPHALT OVERLAYS
• CONSTRUCTION CONTRACT QUALITY WARRANTIES: HYBRID QUALITY ASSESSMENT MODEL
• CONTEXT-SENSITIVE CONSTRUCTION IN KENTUCKY
• DEVELOPMENT OF TEST METHODOLOGY AND MODEL FOR EVALUATION OF CURING EFFECTIVENESS IN CONCRETE PAVEMENT CONSTRUCTION
• EVALUATION OF INFRARED IGNITION FURNACE FOR DETERMINATION OF ASPHALT CONTENT
• MAINTENANCE OF HYPERTEXT-BASED SPECIFICATIONS FOR STATE HIGHWAY PROJECTS
• MULTICHARACTERISTIC PERFORMANCE-RELATED SPECIFICATION FOR HOT-MIX ASPHALT PAVEMENT: COMPLETE DEVELOPMENT PROCESS
• OPTIMIZING OPENING OF PORTLAND CEMENT CONCRETE PAVEMENTS USING INTEGRATED MATURITY AND NONDESTRUCTIVE TESTS
• PROCESS FOR SELECTING STRATEGIES FOR REHABILITATION OF RIGID PAVEMENTS UNDER HIGH TRAFFIC VOLUMES
• SIMPLIFIED ANALYSIS OF HEAT-CURVED STEEL GIRDERS
• STATISTICAL QUALITY CONTROL AND QUALITY ASSURANCE EVALUATION OF STRUCTURAL AND PAVING CONCRETE
• STUDY ON PROCUREMENT OF ARCHITECTURAL AND ENGINEERING SERVICES FOR PUBLIC WORKS: CASE FOR QUALIFICATIONS-BASED SELECTION
• SUCCESSFUL APPLICATION OF GROUND-PENETRATING RADAR FOR QUALITY ASSURANCE-QUALITY CONTROL OF NEW PAVEMENTS
• TOWARD A COMPREHENSIVE POLICY OF NIGHTTIME CONSTRUCTION WORK
• USE OF A RIDE QUALITY INDEX FOR CONSTRUCTION QUALITY CONTROL AND ACCEPTANCE SPECIFICATIONS