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混凝土通常以抗压强度作为配合比设计和质量控制的主要指标。因为在配合比已确定的条件下,抗压强度的高低基本上可以表征其它性能的优劣。在特殊情况下可用耐久性、抗渗性等作为配合比设计和质量控制的指标, 实践表明,混凝土组成材料性能的差异、称量配比、搅拌、成型和养护工艺过程的变动,都会引起混凝土抗压强度的变异。即使上述条件完全相同,由于试件制作、试验及处理上的差别也会引起抗压强度的变异。采用数理统计方法可以找出
The compressive strength of concrete is usually used as the main indicator of the mix design and quality control. Because under the condition that the mix ratio has been determined, the compressive strength can basically indicate the advantages and disadvantages of other properties. In special cases, durability, impermeability, etc. can be used as indicators for mix design and quality control. Practice has shown that differences in the properties of concrete constituent materials, weighing ratios, mixing, molding, and maintenance process changes can all cause concrete. Variation in compressive strength. Even if the above conditions are exactly the same, the variation in compressive strength can also be caused by the differences in specimen preparation, testing, and handling. Mathematical statistics method can be used to find out