Fracture Mechanical Behavior of Aggregate–Cement Matrix Interfaces
Publication: Journal of Materials in Civil Engineering
Volume 7, Issue 4
Abstract
Cracks in concrete propagate preferentially along cement-aggregate interfaces. Therefore, these interfaces act like weak links. The fracture mechanical behavior of the interfaces can be described quantitatively by means of the specific fracture energy G F, which is obtained from the load-displacement curve of the wedge-splitting test. The G F values of the selected sandstone-matrix and limestone-matrix composites varied between 6 and 18 N/m, although the specific fracture energy of the matrix was about 80 N/m; this means that the resistance against crack propagation of interfaces between aggregate surfaces and matrix is only 1/6th of the cement-matrix resistance. This demonstrates the different behavior of the interfaces compared to the matrix. Testing composite specimens of different dimensions showed that there is only a small size effect in the fracture surface area range of 22.5–85 cm 2 (ligament length approximately 4.8–8.4 cm). In the range of 22.5–45 cm 2 (ligament length approximately 4.8 cm), an augmentation of the fracture surface area leads to an increase of the G F value of the cement matrix. Above 45 cm 2 (ligament length approximately 4.8 cm), G F remains almost constant.
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References
1.
Aicher, S., and Reinhardt, H. W.(1993). “Einfluß der Bauteilgröße in der linearen und nichtlinearen Holzbruchmechanik.” Holz als Roh- und Werkstoff, Berlin, Germany, 51, 215–220.
2.
Bažant, Z. P.(1984). “Size effect in blunt fracture: concrete, rock, metal.”J. Engrg. Mech., ASCE, 110(4), 518–535.
3.
Brameshuber, W., and Hilsdorf, K. H.(1990). “Influence of ligament length and stress state on fracture energy of concrete.”Engrg. Fracture Mech., 10, 148–156.
4.
Hillemeier, B. (1976). “Bruchmechanische Untersuchungen des Rißfortschritts in zementgebundenen Werkstoffen,” PhD thesis, Univ. of Karlsruhe, Germany (in German).
5.
Hillerborg, A., Modeer, M., and Peterson, P. E.(1976). “Analysis of formation and crack growth in concrete by means of fracture mechanics and finite elements.”Cement and Concrete Res., 6, 773–782.
6.
Hsu, T. T. C., and Slate, F. O.(1963). “Tensile bond strength between aggragate and cement paste of mortar.”J. Am. Concrete Inst., 60(4), 465–486.
7.
Larbi, J. A. (1993). Microstructure of the interfacial zone around aggregate particles in concrete, 38(1), TNO Build. and Constr. Res., Dept. of Build. Technol., Rijswijk, Heron, The Netherlands.
8.
Malvar, L. J., and Warren, G. E. (1988). “Fracture energy for the three-point-bending tests on single-edge-notched beams.”Experimental Mech., (Sept.), 266–272.
9.
“RILEM draft recommendation (50-FMC, 1985): Determination of the fracture of mortar and concrete by means of three-point bend tests on notched beams.” (1985). Mat. and Struct., 18, 287–290.
10.
Roelfstra, P. E. (1988). “Numerical concrete,” PhD thesis, ETH Lausanne, Switzerland.
11.
Sakai, M., and Inagaki, M.(1989). “Dimensionless load-displacement relation and its application to crack propagation problems.”J. Am. Ceramic Soc., 72(3), 388–394.
12.
Sih, G., Paris, P. C., and Irwin, G. R.(1965). “On cracks in rectilineary anisotropic bodies using singular isoparametric elements.”Int. J. Fracture Mech., 1, 189–203.
13.
Suga, T., and Elssner, G. (1985). “Haftfestigkeitsbestimmung an Keramik-Metall-Verbindungen mit Hilfe von Schichtverbundproben.”Z. Werkstofftech, 16, 75–80 (part 1), 122–125 (part 2), (in German).
14.
Tschegg, E. K.(1991). “New equipment for fracture tests on concrete.”Mat. Testing (Materialprüfung), Berlin, Germany, 33, 338–342.
15.
Tschegg, E. K., and Stanzl, S. E.(1991). “Adhesive power measurements of bonds between old and new concrete.”J. Mat. Sci., 26, 5189–5194.
16.
Tschegg, E. K., Kirchner, H. O. K., and Kocak, M.(1990). “Cracks at the Ferrite-Austenite interfaces.”Acta Metallurgica & Materialia, 38(3), 469–478.
17.
Tschegg, E. K., Kirchner, H. O. K., and Schwalbe, K.-H.(1993a). “Cracks at interfaces of different cohesion.”Acta Metall. & Mat., 41(9), 2783–2790.
18.
Tschegg, E. K., Stanzl-Tschegg, S. E., and Litzka, J. (1993b). “New testing method to characterize mode I fracturing of asphalt aggregate mixtures.”Proc., 2nd RILEM Conf., “Reflective Cracking in Pavements,” C.R.R., J. M. Rigo, R. Degeimbre, and L. Francken, eds., F & FN Spon, London, England, 263–270.
19.
Tschegg, E. K., Elser, M., and Kreuzer, H.(1994). “Mode I fracture behavior of concrete under biaxial loading.”J. Mat. Sci., 30, 235–242.
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Copyright © 1995 American Society of Civil Engineers.
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Published online: Nov 1, 1995
Published in print: Nov 1995
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