00755135

Component

https://doi.org/10.3141/1611-04

http://scholar.google.com...izek&publication_year=1998

A stabilized fiber-reinforced base course material composed largely of recycled concrete aggregate with small amounts of portland cement and fly ash was subjected to repeated flexural loading to evaluate its resilient properties and progressive accumulation of fatigue damage. Cyclic load-deformation data were recorded continuously during the entire fatigue life until fracture to determine (a) the magnitude and variation of cumulative plastic strain and dynamic elastic modulus as a function of the number of loading cycles, (b) a range for the resilient modulus, and (c) the effect of fiber inclusions on the dynamic material properties and rate of damage accumulation. The extent of fatigue damage was calculated as a fatigue damage index, which is based on the cumulative energy dissipated (absorbed) during cyclic loading. All beam specimens used in this experimental program contained (by weight) 4% cement, 4% fly ash, and 92% recycled aggregate; the fiber-reinforced specimens contained an additional 4% (by weight) hooked-end steel fibers. Results show that the resilient modulus in flexure varies between about 2.75 GPa (400,000 lbf/sq in.) and 10.4 GPa (1.5 million lbf/sq in.) and the degradation of the dynamic elastic modulus does not exceed 25% of the initial modulus. Miner's Rule of linear summation of damage is applicable to unreinforced material but not to fiber-reinforced material. In general, a modest amount of reinforcing fibers was very effective in retarding the rate of fatigue damage accumulation in this lean cementitious composite.

This paper appears in Transportation Research Record No. 1611, Stabilization and Geosynthetics.

English

p. 28-37

1998

Transportation Research Record

0309064562

Figures (8) ; References (11) ; Tables (2)

Accelerated tests; Base course (Pavements); Concrete aggregates; Deformation; Failure; Fiber reinforced concrete; Fly ash; Modulus of elasticity; Modulus of resilience; Plasticity; Portland cement; Recycled materials; Repeated loads; Resilience (Materials); Strain (Mechanics)

Fiber reinforcement; Plastic strain

Design; Geotechnology; Highways; Pavements; I22: Design of Pavements, Railways and Guideways

TRIS, TRB, ATRI

Oct 28 1998 12:00AM

• BENEFITS OF USING GEOGRIDS FOR BASE REINFORCEMENT WITH REGARD TO RUTTING
• FORENSIC EVALUATION OF THREE FAILED CEMENT-TREATED BASE PAVEMENTS
• GEOGRID REINFORCING OF RECYCLED AGGREGATE MATERIALS FOR ROAD CONSTRUCTION: FINITE ELEMENT INVESTIGATION
• LABORATORY INVESTIGATION OF COAL WASTES FOR SECONDARY ROADS
• OPTIMIZING MULTIAGENT, MULTI-INJECTED SWELL MODIFIER
• STABILIZATION CHARACTERISTICS OF CLAYS USING CLASS C FLY ASH
• STABILIZATION OF SULFATE-CONTAMINATED CRUSHED CONCRETE BASE WITH TYPE V CEMENT AND FLY ASH
• STABILIZATION OF WEAK CLAY WITH STRONG SAND AND GEOGRID AT SAND-CLAY INTERFACE
• TENSILE PROPERTIES OF ASPHALT OVERLAY GEOSYNTHETIC REINFORCEMENT
• USING GEOGRIDS FOR BASE REINFORCEMENT AS MEASURED BY FALLING WEIGHT DEFLECTOMETER IN FULL-SCALE LABORATORY STUDY