Preparation method for decreasing thermal expansion coefficient of concrete
A technology of thermal expansion coefficient and concrete, which is applied in the field of building structural materials and can solve problems such as early cracking of concrete
Inactive Publication Date: 2018-11-27
CHINA THREE GORGES UNIV
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[0023] Below we further elaborate and demonstrate the present invention and experimental results in conjunction with specific embodiments.
[0024] The preparation of this example is according to the experimental procedures of "Cement Mortar Strength Testing Method (ISO Method)", and in combination with the materials to be added and the preparation method in the present invention, 7 groups (3 for each group, 21 in total) 40mm× 40mm×16mm standard test piece, all test pieces are prepared in the same batch. The materials used in the experiment are listed in the table below.
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The invention discloses a preparation method for decreasing the thermal expansion coefficient of concrete. According to the novel preparation method, the effect is good, the thermal expansion coefficient of the concrete can be decreased, and the preparation method can meet the strength requirements of the concrete. According to the technical scheme, a negative thermal expansion material with hot contraction and cold expansion properties is added into the concrete, so that swelling deformation caused due to the heating of the concrete can be effectively counteracted or partially counteracted, and the thermal expansion coefficient of the concrete is decreased. According to the preparation method, a proper amount of zirconium tungstate (ZrWO2) with the negative thermal expansion property is doped into the concrete, so that a new temperature control research thought is provided for solving the problem that the concrete usually cracks in the early period due to the poor temperature stress in large-volume concrete structural construction.
Description
technical field [0001] The invention relates to building structure materials, especially the crack resistance research in the construction process of large-volume concrete structures, in particular to a preparation method capable of reducing the thermal expansion coefficient of concrete. Background technique [0002] At present, in the construction of large-volume concrete structures, large temperature stresses are often generated due to the influence of unfavorable temperature loads on the concrete (caused by its own cement hydration heat, external temperature, construction factors, etc.), and then some parts of the structure are generated. Early cracking phenomenon, which will cause concrete cracks to continue to extend under other loads in the later stage, and even develop into penetrating cracks, which will also cause internal steel bars to corrode, which will seriously affect the safety and service life of the building structure. Therefore, temperature deformation is a ...
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Login to View More IPC IPC(8): C04B28/04C04B22/08
CPCC04B22/08C04B28/04C04B22/002C04B14/06
Inventor 李洋波沈炎陈波杨挺万易冬曹思宇马荧秋
Owner CHINA THREE GORGES UNIV