CONCRETE FOR TUNNEL LINERS: MIX DESIGN RECOMMENDATIONS FOR PROTOTYPE EXTRUDED LINER SYSTEM
Fiber reinforced, quick-setting cement concrete mix designs are suggested for use in the development of a prototype liner system. These mix designs can meet the structural and durability requirements of the tunnel liner and can be placed in a slipform by pumping. The mix designs are governed mainly by the fact that the mix must be pumpable. Aggregate shape and gradation are critical. A mix with a high likelihood of pumpability can be formulated by adherence to a procedure based on prevention of segregation failure, the most common pumping failure mode of fiber reinforced concrete. Fiber reinforced concrete mixes proportioned for pumping are of high strength, by normal standards, because of the paste content necessary for workability. Conventional pumping equipment is believed adequate for placing properly designed fiber reinforced concrete mixes if components are selected to minimize line head losses and minimize remolding of the concrete. Mixes for a specific field application should be tested for set times, pumpability and strength, using field procedures for batching, mixing, and placing, prior to actual field use.
- This project was sponsored by FRA.
University of Illinois, Urbana-ChampaignDepartment of Civil and Environmental Engineering
205 North Mathews Avenue
Urbana, IL USA 61801-2352
Federal Railroad Administration1200 New Jersey Avenue, SE
Washington, DC USA 20590
- Halvorsen, G T
- Kesler, C E
- Paul, S L
- Publication Date: 1975-8
- Features: Figures; References; Tables;
- Pagination: 29 p.
- TRT Terms: Aggregate gradation; Aggregates by shape and surface texture; Concrete; Concrete placing; Durability; Fiber reinforced concrete; Mix design; Pumped concrete; Tunnel lining; Tunneling
- Uncontrolled Terms: Aggregate shape
- Subject Areas: Bridges and other structures; Highways; Materials;
- Accession Number: 00127848
- Record Type: Publication
- Source Agency: Federal Railroad Administration
- Report/Paper Numbers: FRA OR&D 75-89 Final Rpt.
- Contract Numbers: DOT FR 30022
- Files: NTIS, TRIS, USDOT
- Created Date: Dec 29 1976 12:00AM