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Experimental Study on the Strength of Concrete under Uniaxial Tensile Load after Freeze-thaw Cycles

Author: FuLiZhi
Tutor: CaoDaFu
School: Yangzhou University
Course: Structural Engineering
Keywords: Concrete Freeze-thaw cycles Uniaxial tensile Initial elastic modulus Splitting tensile strength Stress-strain relations
CLC: TU528
Type: Master's thesis
Year: 2010
Downloads: 93
Quote: 0
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Abstract


Concrete structure as the dominant structure in the infrastructure construction in China, has been commonly used in many areas of the concrete structure of the service environment has become increasingly complex, the freeze-thaw damage as one of the main disadvantage of which exhibit an increasingly prominent. Research on the basic mechanical properties of concrete under the freezing and thawing cycles a lot, but less degradation of the mechanical properties of concrete after freezing and thawing law system, especially on the tensile properties of concrete after freezing and thawing is almost empty . Therefore, the study of concrete in freeze-thaw environments the tensile performance has important theoretical significance and application value. This article as part of the National Natural Science Foundation project force performance of \deformation study, a comparative analysis of the test results with the experimental data of normal concrete form as simple as possible, and applicable to the widest possible range of relations function. The main work of this paper are as follows: 1 C20, C30, C40, C50 of the four grade concrete 150mm × 150mm × 150mm cube specimens and 120mm × 120mm × 400mm tensile specimens thawing test, including freeze-thaw cycles of 25 times, weight loss and dynamic elastic modulus determination of 50 times, 75 times, 100 times and 125 times, respectively, to reach the specified number of times. The normal and ordinary concrete specimens after freezing and thawing on the universal concrete testing machine uniaxial compressive strength, splitting tensile axial tension load test. Ordinary concrete after freezing and thawing in the uniaxial compressive strength, splitting tensile and axial tension test failure pattern and failure pattern under the same loading conditions were compared with normal concrete. Analysis of freeze-thaw cycles and concrete level of ordinary concrete strength and deformation were established after two freeze-thaw ordinary concrete in uniaxial compressive strength, splitting tensile and axial tension early initial elastic modulus and elastic limit strain relations. 5. Analysis after freezing and thawing of concrete compressive strength, splitting tensile strength and tensile peak stress and dynamic elastic modulus of the relationship, and establish a direct relationship between the function. 6. Establish a freeze-thaw tensile stress - strain curve rising segment equation. Studies have shown that the obvious: the impact of freezing and thawing times and concrete grade concrete performance. With the freezing and thawing increase in the number of the basic performance of the test piece was a significant downward trend; concrete level of increase has slowed the decline in performance in the same number of freeze-thaw.

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CLC: > Industrial Technology > Building Science > Building Materials > Non-metallic materials > Concrete and concrete products
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