00802460

Component

https://doi.org/10.3141/1716-10

http://scholar.google.com...eira&publication_year=2000

Since 1992, the Federal University of Rio Grande do Sul, along with the roads department of the same Brazilian state, has undertaken comprehensive research on weathered basalts, with the purpose of reducing the cost of low-volume pavements. Laboratory studies have led to a criterion (on the basis of the point load test) used to select deposits of these intensely fractured rocks. A traffic simulator was designed and built, and a pavement test facility was constructed on the university campus. A study was done of rutting of thin pavements on which weathered basalts were used as base layers. The traffic simulator applied more than 267,000 axle loads, ranging from 82 to 130 kN, on five full-scale test sections. Two different weathered basalts and three base thicknesses were used. A postmortem evaluation revealed that the base layer contributed the most to rutting. The axle load applications caused the pavement structure to settle and consolidate. A total of 4,148 measurements of rut depth, made at intervals, provided a statistically significant data set. Rutting evolution was shown to depend not only on traffic characteristics but also on pavement structure. With consideration of rutting as a major failure cause in thin pavements and a rut depth of 25 mm as a terminal criterion, load equivalence factors were calculated by means of a reliability analysis.

This paper appears in Transportation Research Record No. 1716, Pavement Assessment and Testing.

English

p. 82-88

2000

Transportation Research Record

0309066956

Figures (6) ; Photos (1) ; References (17) ; Tables (6)

Basalt; Base course (Pavements); Depth; Pavements; Reliability; Rutting; Test facilities; Thickness; Weathered rock

Load equivalence factors

Brazil

Highways; Pavements; I23: Properties of Road Surfaces

TRIS, TRB, ATRI

Nov 7 2000 12:00AM

• ACCELERATED PAVEMENT TESTING OF RUTTING PERFORMANCE OF TWO CALTRANS OVERLAY STRATEGIES
• BACKCALCULATION OF THERMALLY DEFORMED CONCRETE PAVEMENTS
• CURVILINEAR BEHAVIOR OF BASE LAYER MODULI FROM DEFLECTION AND SEISMIC METHODS
• DYNAMIC INTERPRETATION OF FALLING WEIGHT DEFLECTOMETER TEST RESULTS: SPECTRAL ELEMENT METHOD
• EFFECT OF MOISTURE ON MODULUS VALUES OF BASE AND SUBGRADE MATERIALS
• ESTIMATING SUBGRADE STIFFNESS AND BEDROCK DEPTH: COMBINED FALLING WEIGHT DEFLECTOMETER AND SIMPLIFIED SPECTRAL ANALYSIS OF SURFACE WAVES MEASUREMENTS
• EVALUATING MEASURED TIRE CONTACT STRESSES TO PREDICT PAVEMENT RESPONSE AND PERFORMANCE
• EVALUATING RUNWAY PAVEMENTS AT SEATTLE-TACOMA INTERNATIONAL AIRPORT: CONTINUOUS DEFLECTION PROFILES MEASURED WITH THE ROLLING DYNAMIC DEFLECTOMETER
• IT'S 10 O'CLOCK: DO YOU KNOW WHERE YOUR SENSORS ARE?
• PERFORMANCE OF SUPERPAVE MIXTURES UNDER ACCELERATED LOAD TESTING
• PERFORMANCE PREDICTION OF LOUISIANA ACCELERATED LOADING FACILITY TEST SECTIONS
• SUPER-ACCELERATED TESTING OF FLEXIBLE PAVEMENT WITH STATIONARY DYNAMIC DEFLECTOMETER
• TEMPERATURE CORRECTION ON FALLING WEIGHT DEFLECTOMETER MEASUREMENTS
• TRUCK TRAVEL TIME AROUND WEIGH STATIONS: EFFECTS OF WEIGH IN MOTION AND AUTOMATIC VEHICLE IDENTIFICATION SYSTEMS
• USING A ROAD SURFACE ANALYZER TO EXPLAIN NOISE CHARACTERISTICS OF PORTLAND CEMENT CONCRETE PAVEMENT SURFACE TEXTURE
• USING TRANSVERSE PROFILE DATA TO COMPUTE PLASTIC DEFORMATION PARAMETERS FOR ASPHALT CONCRETE PAVEMENTS