MECHANISM OF DETERIORATION OF CEMENT COMPOSITES DUE TO LEACHING OF CALCIUM

This paper describes the degradation mechanism of cement composites derived from accelerated testing. Investigations were conducted using 3 different accelerated test methods (immersion, dissolution, and permeation cell test methods). Main findings of the study include: 1) 30-50% of calcium in cement composites was leached out in several months in the accelerated tests; 2) in all tests, calcium leaching from Ca(OH)2 and C-S-H was observed, and the change in porosity and physical properties corresponding to the leaching degree was found; and 3) a possibility to predict the long-term degradation behavior of structures by using numerical analysis was demonstrated.

• Corporate Authors:

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Watanabe, K
  • Yokozeki, K
  • Otsuki, N
  • Daimon, M
• Conference:
  • Fifth CANMET/ACI International Conference on Durability of Concrete
  • Location: Barcelona, Spain
  • Date: 2000-6-4 to 2000-6-9
• Publication Date: 2000

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 1155-72

Subject/Index Terms

• TRT Terms: Accelerated tests; Calcium compounds; Calcium hydroxide; Composite materials; Leaching; Numerical analysis; Structural deterioration and defects; Structural materials
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00976429
• Record Type: Publication
• Report/Paper Numbers: SP-192-70
• Files: TRIS
• Created Date: Jul 8 2004 12:00AM