A NEW UNBONDED CAPPING PRACTICE FOR EVALUATING THE COMPRESSIVE STRENGTH OF CONTROLLED LOW-STRENGTH MATERIAL CYLINDERS

Controlled Low-Strength Material (CLSM) is a low strength cementitious material often used for pipe bedding, backfill, void fills, and in some cases bridges approaches. Because of its low strength, handling of test cylinders, especially at early ages, is often not possible or results in significant damage to the samples. Sulfur-capped specimens require more handling than non-sulfur capped specimens. To minimize handling, a new material is proposed for use as an end pad for compressive strength tests. Similar to the approach used for conventional concrete cylinders, the proposed method uses different pads for different CLSM compressive strength levels. Pads made of sorbothane viscoelastic polyurethane rubber, neoprene, and a combination of the 2 were used for compressive strength and variability. Results show that the sorbothane viscoelastic polyurethane rubber material should be used when the compressive strength of the CLSM is less than approximately 1 MPa and neoprene pads with a durometer value not greater than 50 should be used when the compressive strength is expected to be >2 MPa. Either pad type can be used for CLSM mixtures with expected compressive strengths from 1.0 to 2.0 MPa.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3528769
• Corporate Authors:

  ASTM International

  100 Barr Harbor Drive
  West Conshohocken, PA  United States  19428-2959
• Authors:
  • Du, L
  • Folliard, K J
  • Trejo, David
• Publication Date: 2004-6

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 1-8
• Serial:
  • Cement, Concrete and Aggregates
  • Volume: 26
  • Issue Number: 1
  • Publisher: American Society for Testing and Materials (ASTM)
  • ISSN: 0149-6123
  • Serial URL: http://journalsip.astm.org/JOURNALS/CEMENT/cca_home.html

Subject/Index Terms

• TRT Terms: Backfilling; Bridge approaches; Cement additives; Compressive strength; Concrete tests; Flowable fill; Structural materials; Viscoelastic materials
• Uncontrolled Terms: Test cylinders; Unbonded caps
• Subject Areas: Bridges and other structures; Design; Highways; Materials; I24: Design of Bridges and Retaining Walls; I32: Concrete;

Filing Info

• Accession Number: 00975263
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 16 2004 12:00AM