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高性能混凝土是当前国家重点推广技术,其强度和耐久性具有尺寸效应现象。室内试验和不同养护条件下,标准试件15cm立方体和10cm立方体抗压强度之间具有较高的线性相关性,尺寸效应换算系数fcu,15/fcu,10随标准抗压强度的增大呈减小趋势。随着尺寸的增大,试件的抗渗性和抗冻性均大大降低。结构芯样在尺寸效应上较试件小,但其存在更多的微裂纹和缺陷,使得抗渗性和抗冻性急剧降低,不能用于评价混凝土结构的耐久性。
High-performance concrete is the current national key promotion technology, its strength and durability with size effect phenomenon. Under laboratory and under different curing conditions, the compressive strength of 15cm cube and 10cm cube of the standard specimen has a high linear correlation, the size effect conversion factor fcu, 15 / fcu, 10 decreases with the increase of standard compressive strength Small trend. As the size increases, the impermeability and frost resistance of the specimens are greatly reduced. The structural core sample is smaller in size effect than the test piece, but it has more microcracks and defects, leading to drastic decrease of impermeability and frost resistance and can not be used for evaluating the durability of the concrete structure.