In this paper, the shrinkage deformation of C35 and C50 concrete and its equivalent mortar by each factor under the complex coupling environment of low air pressure, large temperature difference, windy drying, and strong ultraviolet radiation is systematically studied by using an independently designed complex environment simulation platform. The effects of each environmental factor on the shrinkage and deformation, hydration degree and pore structure of concrete under the complex environment were analyzed. The results showed that the shrinkage deformation of concrete under the complex environment of plateau increased significantly, and the dominant factor was windy and dry, followed by low air pressure and ultraviolet radiation, and the temperature difference did not lead to further intensification of shrinkage. At the same time, the shrinkage deformation of concrete under plateau complex environment was closely related to the degree of hydration and pore structure. Compared with the standard curing environment, the plateau complex environment reduced the hydration degree of concrete and increased the number of various types of pore size, of which the effect of windy drying on the hydration degree of concrete and capillary pore content is particularly significant.

中文翻译：

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耦合环境因子对高海拔混凝土收缩性能的影响


本文利用自主设计的复杂环境仿真平台，系统研究了在低气压、大温差、风干、强紫外线照射等复杂耦合环境下，C35和C50混凝土及其等效砂浆各因素的收缩变形。分析了复杂环境下各环境因子对混凝土收缩变形、水化程度和孔隙结构的影响。结果表明：在高原复杂环境下，混凝土的收缩变形显著增加，主导因素为多风干燥，其次是低气压和紫外线照射，温差未导致收缩进一步加剧。同时，高原复杂环境下混凝土的收缩变形与水化程度和孔隙结构密切相关。与标准养护环境相比，高原复杂环境降低了混凝土的水化程度，增加了各种孔径的数量，其中风干对混凝土水化程度和毛细孔隙含量的影响尤为显著。