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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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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.
Title: Free Water in Concrete Pores: an Attempt of Physical Explanation of Concrete Dynamic Behavior
Author(s): Francois Toutlemond and Pierre Rossi
Publication: Special Publication
Appears on pages(s): 261-280
Keywords: compressive strength; concretes; dynamic loads; tests; water-cement ratio
Abstract:A large experimental program has been carried out in order to better under-stand basic physical mechanisms explaining rate effects on concrete strength. Direct tensile tests and compressive tests were performed on different con cretes. Slab tests using a shock tube were also carried out using the same materials. It has been demonstrated that for intermediate strain rates (about 1O-5 to 1 s ) the strength enhancement can be explained by the presence of free water in the nanopores of concrete. A mathematical expression is pro-posed which accounts for the role of significant parameters. The slab tests confirm the physical analysis developed at the material level. Some specific phenomena (possible occurrence of either shear failure or bending failure, relative smaller strength enhancement than in direct tension) confirm the ne-cessity of models based more on the physical properties of the material for structural analysis in dynamics.
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