Durability of Soil–Cements against Fatigue Fracture
Cementitious stabilization is a common method of ground improvement when weak foundation soils are encountered in practice, and marginal or nonstandard materials such as recycled aggregates are used in civil engineering construction. Long-term durability of stabilized materials becomes an issue, especially when it involves one or more recycled materials with unknown and often questionable properties. The study presented herein investigates the fatigue durability, endurance limit, and damage accumulation process in recycled crushed concrete aggregate stabilized with cement–fly ash mixtures. Results show that the 2 million cycles fatigue endurance limit for the stabilized recycled aggregate was nearly 53% of the static modulus of rupture, indicating that the fatigue strength of this material is quite similar to or better than other traditional cementitious composites. It was also found that the accumulated permanent deformation and the expended fatigue life can be related by a nonlinear power law; and the fatigue damage in this material approximately follows Miner's rule for cumulative damage. Finally, the importance of developing innovative testing methods for durability assessment are highlighted, which include coupled mechanical and environmental loadings to simulate the most damaging field conditions, and accelerated aging and life prediction processes using the Arrhenius time–temperature superposition methods.
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- Sobhan, Khaled
- Das P.E., F.AS, Braja M.
- Publication Date: 2007-1
- Media Type: Print
- Features: Figures; References; Tables;
- Pagination: pp 26-32
- TRT Terms: Admixtures; Aggregates; Aging (Materials); Bonding; Cement; Civil engineering; Composite materials; Concrete aggregates; Construction; Deformation; Dissipation; Durability; Durability tests; Dynamic loads; Fatigue (Mechanics); Field tests; Fly ash; Foundation soils; Fracture mechanics; Mathematical prediction; Mechanical loads; Modulus of rupture; Pavements; Properties of materials; Recycled materials; Simulation; Soil cement; Soil stabilization; Soils; Stabilized materials; Strength of materials; Testing
- Uncontrolled Terms: Arrhenius model; Fatigue damage; Fatigue life; Time temperature superposition
- Subject Areas: Construction; Data and Information Technology; Energy; Geotechnology; Highways; Materials; Pavements; I42: Soil Mechanics;
- Accession Number: 01042722
- Record Type: Publication
- Files: TRIS
- Created Date: Feb 18 2007 3:38PM