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Limiting tensile strain in concrete
Conclusions 1. The elastic strains and creep of concrete, measured on insulated specimens subjected to tension, are directly proportional to the relative stress level. This relationship provides an easy method for determining, without taking into account the plastic deformations, the arbitrary limiting tensile strain of concrete-elastic and creep without taking the specimens to destruction. 2. The limiting elastic strain of concrete increases insignificantly with strength. Remembering that changing to a higher grade of cement involves an increase in consumption, and consequently, in thermal stresses, it is not advisable to use concrete of a higher grade for increasing the crack resistance. 3. The creep deformations in concrete from the same mix, loaded to the same stress levels at different ages, are equal. Hence, in the case of insulated samples the limiting tensile strain with respect to creep does not depend on its age. 4. Concretes from gravel or diabasic aggregates are practically equivalent with respect to the deformational properties. 5. It is necessary to specify a single method for the experimental determination of the limiting tensile strain. Noting that the limiting tensile strain characterizes its resistance to cracking due to temperature stresses, and that in this case the temperature stresses are of a character more analogous to bending stresses than direct tension or splitting, it is necessary to use Ri in Eq. (4) instead of Rs.
Limiting tensile strain in concrete
Conclusions 1. The elastic strains and creep of concrete, measured on insulated specimens subjected to tension, are directly proportional to the relative stress level. This relationship provides an easy method for determining, without taking into account the plastic deformations, the arbitrary limiting tensile strain of concrete-elastic and creep without taking the specimens to destruction. 2. The limiting elastic strain of concrete increases insignificantly with strength. Remembering that changing to a higher grade of cement involves an increase in consumption, and consequently, in thermal stresses, it is not advisable to use concrete of a higher grade for increasing the crack resistance. 3. The creep deformations in concrete from the same mix, loaded to the same stress levels at different ages, are equal. Hence, in the case of insulated samples the limiting tensile strain with respect to creep does not depend on its age. 4. Concretes from gravel or diabasic aggregates are practically equivalent with respect to the deformational properties. 5. It is necessary to specify a single method for the experimental determination of the limiting tensile strain. Noting that the limiting tensile strain characterizes its resistance to cracking due to temperature stresses, and that in this case the temperature stresses are of a character more analogous to bending stresses than direct tension or splitting, it is necessary to use Ri in Eq. (4) instead of Rs.
Limiting tensile strain in concrete
Alekseev, K. V. (Autor:in)
Hydrotechnical Construction ; 5 ; 238-242
01.03.1971
5 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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