EFFECT OF STRAIN RATE ON THE COMPRESSIVE STRENGTH SURFACE CRACKING AND FAILURE MODE OF MORTAR

This study aims to improve the knowledge on the strain rate sensitive behavior in compressive strength, cracking process, and failure mode for brittle materials by testing concrete constituent, mortar, at different rates of straining. Cracks on the surface of specimens are observed with two long distance microscopes and recorded synchronously with loading and deformation response for the mortar at different rates of straining. For the mortar in a range of strain rates from 0.2 to 20,000 microstrains/sec, the compressive strength increases with an increasing strain rate. As the strain rate increases, the failure shows comparatively more violence and faster time of crack propagation, with an increasing number of cracks and fragments. At a lower strain rate, cracking on the surface of specimens starts earlier and at a lower stress state than that at a higher strain rate. The strain rate effect on the failure mode and cracking process indicates the reason why compressive strength and other mechanical properties of mortar and concrete are sensitive to the strain rate.

• Record URL:
  • http://www.concrete.org/Publications/InternationalConcreteAbstractsPortal.aspx.aspx?m=details&i=393
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/13846872
• Supplemental Notes:
  • This project was supported by National Nature Science Foundation of China (19472021).
• Corporate Authors:

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Zhaoxia, L
  • Yaoping, H
• Publication Date: 1998-9

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 512-518
• Serial:
  • ACI Materials Journal
  • Volume: 95
  • Issue Number: 5
  • Publisher: American Concrete Institute (ACI)
  • ISSN: 0889-325X
  • Serial URL: https://www.concrete.org/publications/acimaterialsjournal.aspx

Subject/Index Terms

• TRT Terms: Compressive strength; Concrete; Cracking; Experiments; Failure; Mechanical properties; Mechanical strain; Mortar
• Uncontrolled Terms: Crack propagation; Strain rate
• Old TRIS Terms: Failure mode
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00757784
• Record Type: Publication
• Contract Numbers: 19472021
• Files: TRIS
• Created Date: Dec 27 1998 12:00AM