MODIFICATION OF BRIDGES WITH CLSM

Controlled low-strength material (CLSM) is a high slump product that usually contains portland cement, fly ash, fine aggregate, and water. CLSM is known by many different names: flowable fill, controlled density fill, flowable mortar, unshrinkable fill, and lean concrete backfill. During the past 6 years, the use of CLSM as a backfill for pipelines has increased rapidly. Since 1990, it has been used by the Colorado Department of Transportation (CDOT) for backfilling around pipes or box culverts under existing substandard bridges to convert the bridges to on-grade roadways. The Iowa DOT, pioneers of this method of modifying substandard bridges, has completed more than 40 bridge conversion projects using CLSM since 1979. The CDOT first used CLSM in 1991. In 1993, the CDOT completed two bridge conversion projects; one of the projects was on Colorado Highway 385, 10 miles (16 km) south of Burlington, and the other one was on Colorado Highway 83, 1 mile (1.6 km) north of Franktown.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/4163061
• Corporate Authors:

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Goldbaum, J E
  • Hook, W
  • Clem, D A
• Publication Date: 1997-5

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 44-47
• Serial:
  • Concrete International
  • Volume: 19
  • Issue Number: 5
  • Publisher: American Concrete Institute (ACI)
  • ISSN: 0162-4075

Subject/Index Terms

• TRT Terms: Backfilling; Box culverts; Fine aggregates; Lean concrete; Trench backfill
• Uncontrolled Terms: Conversion; Modifications
• Geographic Terms: Colorado; Iowa
• Subject Areas: Geotechnology; Highways; I36: Aggregates;

Filing Info

• Accession Number: 00736655
• Record Type: Publication
• Files: TRIS
• Created Date: May 28 1997 12:00AM