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在混凝土质量控制中应用数理统计理论,已有三十多年的历史。早在五十年代,各国混凝土学者在研究混凝土质量控制、选定评定指标时曾分成两派,并得出两种完全相反的结论:一派以美国混凝土学会(ACI)为代表,认为当混凝土生产控制条件不变时,混凝土平均抗压强度与均方差呈线性关系,离差系数接近不变,因而选用强度离差系数作为评定指标;另一派以英国土木学会和日本建筑学会为代表,认为当混凝土生产控制条件不变时,混凝土抗压强度均方差也接近不变,而与平均抗压强度无关,因而选用强度均方差作为评定指标。
The application of mathematical statistics theory in concrete quality control, has more than thirty years of history. As early as the 1950s, national concrete scholars in the study of concrete quality control, selected evaluation indicators were divided into two groups, and reached two completely opposite conclusions: One to the American Concrete Institute (ACI) as the representative believes that when the concrete production When the control conditions remain unchanged, the average compressive strength of concrete shows a linear relationship with the mean square error and the coefficient of dispersion close to constant, so the coefficient of variation of strength is selected as the evaluation index. The other school is represented by the British Society of Civil Engineering and the Japanese Institute of Architecture. When the control conditions of concrete production are the same, the mean square deviation of compressive strength of concrete is also close to the same, but not related to the average compressive strength. Therefore, the mean square deviation of strength is chosen as the evaluation index.