Abstract
Fracture tests with a wedge-loading device are carried out on mortar and concrete specimens so as to have stable crack growth. Using laser speckle technique the length of macrocrack and the distribution of crack opening displacement are measured. Results are compared with those obtained by the boundary element method (BEM) analysis for a Dugdale-Barenblatt-type model of a fracture process zone. The governing mechanism in fracture of concrete and the mechanism which is represented by the model are discussed with special attention to the microcracking zone. It is deduced that a Dugdale-Barenblatt-type model does not represent the microcracking zone, thus implying that the microcracking zone and the bridging zone correspond to the pre-peak nonlinear part of the stress-strain curve in a uniaxial tension test and the post-peak tension-softening curve, respectively. It is concluded that the effect of microcracking on the maximum load is less significant than that of bridging. Possible models which include the effect of microcracking in addition to that of bridging are proposed.
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References
Fracture of Concrete and Rock, Proceedings of SEM—RILEM International Conference, Jun. 17–19, 1987, Houston, S.P. Shah and S.E. Swartz (eds.), Springer-Verlag (1989).
Cracking and Damage: Strain Localization and Size Effect, Proceedings of France—US Workshop on Strain Localization and Size Effect due to Cracking and Damage, Sept. 1988, Cachan, France, J. Mazars and Z.P. Bažant (eds.), (1989).
A.K. Maji and S.P. Shah, in Nondestructive Testing, SP-112, H.S. Lew (ed.), ACI (1988) 83–109.
R.A. Miller, S.P. Shah and H.I. Bjelkhagen, Experimental Mechanics (1988) 388–394.
J.J. Du, A.S. Kobayashi and N.M. Hawkins, in [1] (1989) 199–204.
P. Jacquot and P.K. Rastogi, in Fracture Mechanics of Concrete, F.H. Wittmann (ed.), Elsevier (1983) 113–155, Chapter 3.4.
A. Hillerborg, M. Modéer and P.E. Petersson, Cement and Concrete Res 6 (1976) 773–782.
Z.P. Bažant, Journal of Engineering Mechanics, ASCE 110 (1984) 518–538.
Y.S. Jenq and S.P. Shah, Journal of Engineering Mechanics, ASCE 111 (1985) 1227–1241.
B.L. Karihaloo and P. Nallathambi, Final Report of Sub-committee A Notched Beam Test; Mode I Fracture Toughness of RILEM TC89-FMT (1988).
J. Planas and M. Elices, in [2] (1989) 462–476.
H. Horii, in Boundary Element Methods in Applied Mechanics, Proceedings of the First Joint Japan/US Symposium on Boundary Element Methods, Tokyo, Oct. 3–6, 1988, M. Tanaka and T.A. Cruse (eds.), Pergamon Press (1988) 129–138.
H. Horii, A. Hasegawa and F. Nishino, in [1] (1989) 205–219.
H.A.W. Cornelissen, D.A. Hordijk and H.W. Reinhardt, in Proceedings of Conference on Fracture Mechanics of Concrete, 1, E.P.F.L., Switzerland (1985) 419–429.
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© 1991 Springer Science+Business Media Dordrecht
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Horii, H., Ichinomiya, T. (1991). Observation of fracture process zone by laser speckle technique and governing mechanism in fracture of concrete. In: Bažant, Z.P. (eds) Current Trends in Concrete Fracture Research. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3638-9_2
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DOI: https://doi.org/10.1007/978-94-011-3638-9_2
Publisher Name: Springer, Dordrecht
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