01020887

Component

https://doi.org/10.3141/1979-13

http://scholar.google.com...dhry&publication_year=2006

Flowable fill is a self-compacted, cementitious material used primarily as a backfill in lieu of compacted fill. It generally consists of sand, portland cement, fly ash or slag, and water. It does not settle or require vibration or other means of compaction, it can be excavated, and it is safer than other forms of fill. One approach to predicting its ability to be excavated is to develop a correlation using early-age strength and long-term strength. Flowable fill mixture exhibiting strength less than 0.689 MPa (100 psi) is classified excavatable; mixtures with strengths higher than 0.689 MPa are difficult to excavate and are considered nonexcavatable. Because flowable fill is generally used for backfill and is placed underneath pavement, few studies have been undertaken evaluating moisture effects on long-term strength of flowable fill while underneath pavement. This paper presents the results of a laboratory study evaluating moisture effects on long-term strengths of flowable fill and assesses an accelerated method for predicting its 28-day strength. Samples were cast in limerock bearing ratio cylinders and rectangular wooden molds and were categorized as drained or undrained. Promising results were obtained on how moist environments affect the long-term strength of flowable fill mixtures. Results showed that for an early curing period, the undrained samples exhibited lower strength than drained samples. However, the strength of undrained samples increased with longer periods and to some extent exceeded the drained samples at a 28-day curing period. The accelerated samples had the potential to predict the 28-day strength using an accelerated method.

01039954

English

pp 84-92

2006

Transportation Research Record: Journal of the Transportation Research Board

0309099897

Print

Figures (7) ; References (10) ; Tables (5)

Concrete curing; Flowable fill; Fly ash; Laboratory tests; Portland cement; Sand; Self compacting concrete; Slag; Strength of materials; Trench backfill

Highways; Materials; I32: Concrete

PRP, TRIS, TRB, ATRI

Mar 3 2006 10:49AM

• Activation Energy of Alkali–Silica Reaction and Dilatometer Method
• Capping Systems for High-Strength Concrete
• Comparison of Flatbed Scanner and RapidAir 457 System for Determining Air Void System Parameters of Hardened Concrete
• Effects of Base Type on Modeling Long-Term Pavement Performance of Continuously Reinforced Concrete Sections
• Efforts to Improve Durability of Concrete in Virginia
• Evaluation of Mechanical Properties for Self-Consolidating, Normal, and High-Performance Concrete
• Investigation into Potential of Alkali–Acetate–Based Deicers to Cause Alkali–Silica Reaction in Concrete
• Investigation of Portland Cement Concrete Mix Consistency and Concrete Performance Using Two-Stage Mixing Process
• Long-Term Effects of Magnesium Chloride and Other Concentrated Salt Solutions on Pavement and Structural Portland Cement Concrete: Phase I Results
• Measurement of Volume Change in Cementitious Materials at Early Ages: Review of Testing Protocols and Interpretation of Results
• Mitigating Alkali–Silica Reaction in Concrete Containing Recycled Concrete Aggregate