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Crack Development in Cementitious Materials under Impact Loading

Published online by Cambridge University Press:  25 February 2011

Sidney Mindess ,
Nemy P. Banthia ,
Andrew Ritter  and
Jan P. Skalny
Sidney Mindess
Affiliation:
University of British Columbia, Deptartment of Civil Engineering, 2324 Main Hall, Vancouver, B.C. V6T 1W5, Canada
Nemy P. Banthia
Affiliation:
University of British Columbia, Deptartment of Civil Engineering, 2324 Main Hall, Vancouver, B.C. V6T 1W5, Canada
Andrew Ritter
Affiliation:
Martin Marietta Laboratories, 1450 Rolling Road S., Baltimore, MD 21227
Jan P. Skalny
Affiliation:
W.R. Grace & Co., Washington Research Center, 7379 Route 32, Columbia, MD 21044. (When this work was carried out, Dr. Skalny was with Martin Marietta Laboratories)
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Abstract

Flexural specimens of hardened cement paste, fibre reinforced concrete, and conventionally reinforced concrete were tested in an instrumented dropweight impact machine, employing a 345 kg mass impact hammer dropped from a height of 500 mm. The crack development in the specimens was monitored using high speed motion picture photography, carried out at about 10,000 frames per second. It was found that, for all three specimens, some crack branching occurred. The cracks did not propagate in a continuous fashion; they appeared to arrest occasionally, and then began to grow again. However, it appeared as if the crack velocities reached a maximum value very soon after the impact occurred; they then decreased, and finally increased again just prior to failure. The average crack velocities were in the range of about 75 to 115 m/s.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 64: Symposium S – Cement-Based Composites: Strain Rate Effects on Fracture , 1985 , 217
Copyright
Copyright © Materials Research Society 1986

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References

REFERENCES

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