Effect Of Aggregate Content On Fracture Behavior Of Concrete

1995 ◽  
Vol 409 ◽  
Author(s):  
Y. Xi ◽  
F.E. Amparano ◽  
Zongjin Li
Keyword(s):  
Fracture Energy ◽  
Fracture Process ◽  
Fracture Behavior ◽  
Fracture Process Zone ◽  
Volume Fraction ◽  
Process Zone ◽  
Aggregate Content ◽  
Grain Structures ◽  
Point Bend ◽  
Two Parameters

AbstractEffect of aggregate content on fracture behaviors of concrete is studied by testing on geometrically similar three-point bend beams. The results are analyzed by using a size effect method in which the fracture behavior of concrete is characterized by two parameters, fracture energy Gf and effective fracture process zone cf. Test results showed that with increasing volume fraction of aggregate in the range 45% - 75%: (1) the modulus of elasticity of concrete decreases slightly, (2) fracture energy Gf increases, but the rate is very small; (3) the size of the fracture process zone, cf, decreases, which may be explained by changes in coarseness of grain structures defined in terms of mosaic patterns.

Fiber Debonding Along a Crack Front in Paper

1998 ◽  
Vol 539 ◽  
Author(s):  
H. Kettunen ◽  
K. J. Niskanen
Keyword(s):  
Fracture Energy ◽  
Crack Front ◽  
Fracture Process ◽  
Fracture Process Zone ◽  
Process Zone ◽  
Bond Properties ◽  
Crack Line ◽  
Pull Out ◽  
Microscopic Damage ◽  
Debonding Process

AbstractWe follow the accumulation of microscopic damage ahead the crack tip in paper. The fiber debonding process varies even within each specimen because of large variation in fiber and bond properties. In general, stiff and weakly bonded fibers tend to debond as a rigid body while ductile or well bonded fibers pull out gradually in a process that propagates from the crack line to the fiber ends. Particularly in the latter case the network ruptures coherently rather than through debonding of single fibers. Experimental analysis and simulations show that fracture energy correlates closely with the size of the fracture process zone (FPZ) irrespective the nature of the debonding process. Only the cases of low bonding and stiff fibers seem to make an exception in that FPZ can grow in size without a corresponding increase in fracture energy.

Fracture energy and fracture process zone

1992 ◽  
Vol 25 (6) ◽  
pp. 319-326 ◽  
Author(s):  
X. -Z. Hu ◽  
F. H. Wittmann
Keyword(s):  
Fracture Energy ◽  
Fracture Process ◽  
Fracture Process Zone ◽  
Process Zone

Fracture process zone size and true fracture energy of concrete using acoustic emission

2010 ◽  
Vol 24 (4) ◽  
pp. 479-486 ◽  
Author(s):  
S. Muralidhara ◽  
B.K. Raghu Prasad ◽  
Hamid Eskandari ◽  
B.L. Karihaloo
Keyword(s):  
Acoustic Emission ◽  
Fracture Energy ◽  
Fracture Process ◽  
Fracture Process Zone ◽  
Process Zone ◽  
Zone Size ◽  
True Fracture

Mixed Modes I and II Concrete Fracture: An Experimental Analysis

1994 ◽  
Vol 61 (4) ◽  
pp. 815-821 ◽  
Author(s):  
Z. K. Guo ◽  
A. S. Kobayashi ◽  
N. M. Hawkins
Keyword(s):  
Fracture Process ◽  
Fracture Process Zone ◽  
Process Zone ◽  
Crack Opening ◽  
Concrete Specimen ◽  
Element Model ◽  
Dissipated Energy ◽  
Mixed Mode Fracture ◽  
Aggregate Interlocking ◽  
Point Bend

The development of the fracture process zone associated with subcritical crack growth in a three-point bend concrete specimen with an off-centered, single-edged precrack was monitored with moire interferometry. The applied load and the crack opening and sliding displacements together with a finite element model of the concrete specimen were used to determine the crack closing stress due to aggregate bridging. Under this mixed-mode fracture, aggregate interlocking increased the crack closing stresses in the fracture process zone and hence the load carrying capacity of the concrete specimen. The dissipated energy rate in the fracture process zone also increased with aggregate interlocking.

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