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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 14 Abstracts search results
Document:
SP118-01
Date:
January 1, 1990
Author(s):
Victor c. Li
Publication:
Symposium Papers
Volume:
118
Abstract:
Reviews the tensile failure of concrete structures subjected to a variety of practical loading. Attention is focused on the propensity of fracture failure of concrete structures and the fracture properties of cementitious materials. The relevance of fracture mechanics to modern concrete design code is highlighted.
DOI:
10.14359/2908
SP118-13
Arne Hillerborg
The stress-deformation relation now generally accepted for tensile fracture, i.e., with the descending branch described by means of a stress-displacement relation in a localized band, has been applied to the compressive stresses in a bent, reinforced beam. The displacement in this band is averaged over a length, which is proportional to the depth of the compression zone. The resulting average stress-strain relation, which is strongly size-dependent, is used for the analyses of the stresses in a rectangular beam section, and for the corresponding moment-curvature relationship. The results differ appreciably from those from conventional assumptions. The new approach shows a better agreement with test results than the conventional approach. Further test comparisons are, however, recommended. The new approach may form the basis of changed design assumptions, particularly for high-strength concrete.
10.14359/2983
SP118-03
C. Vipulanandan and N. Dharmandan
Fracture behavior of epoxy and polyester polymer concrete (PC) systems are investigated in Mode I fracture using single-edge notched beams with varying notch depths. The beams were loaded in four-point bending. Influence of polymer content on the fracture behavior of epoxy PC andpolyester PC at room temperature was studied using uniform Ottawa 20-30 sand. The polymer content was varied between 10 and 18 percent of the total weight of the composite. The flexural strength of the polymer concrete systems increase with increase in polymer content while the flexural modulus goes through a maximum. The critical stress intensity factor KIC was determined by two methods, including a method based on crack mouth opening displacement. At the same polymer content, the epoxy PC has a higher fracture toughness than polyester PC. The KIC for epoxy PC and polyester PC increases with increase in polymer content and PC flexural strength. The critical stress intensity factor of PC is represented in terms of polymer content and polymer strength. Numerical tests based on random sampling and stratified sampling procedures were performed to substantiate the experimentally observed fracture toughness values of polymer concrete.
10.14359/2921
SP118
Editors: Victor C. Li and Zdenek P. Bazant
SP-118 This Special Publication of 13 papers presents advances in fracture mechanics involving characterization, resistance measurements, computation tools, and material toughness. The document is divided into two sections. One section deals with the application of fracture mechanics to cementitious materials. The other section covers the application of fracture mechanics to concrete structures.
10.14359/14151
SP118-04
J. C. Chern, C. H. Young, and K. C. Wu
Conventional concrete and mortar are both major construction materials because of their advantages in durability, economy, and comparably good mechanical properties. However, brittleness and low tensile strength are weak constitutions of these materials. Therefore, they provide less resistance to the propagation of cracks. Fibers can resist against the propagation of cracks due to the contribution of traction, resulting from the fibers-matrix bond mechanism, on the crack face. Some exact mathematical formulations to express thestress intensity factor and the crack opening displacement are proposed in this research to interpret the fracture behavior of fiber reinforced cementitious composites. Using these formulations, two fracture criteria can be performed to evaluate the tendency of crack propagation of this composite material. These two criteria are stress intensity factor and crack tip opening displacement. To achieve a more reasonable solution, the couple effect between the crack opening displacement and the fiber bridging traction is also considered. From the numerical results shown in this study, it is concluded that the fiber reinforced concrete provides higher resistance against the propagation of cracks than ordinary plain concrete, and one can clearly understand the resistance ability of fibers for the fracture behavior of concrete.
10.14359/2928
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