Detection Technology of Concrete Compression Strength
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摘要: 近年来，上海地区混凝土原材料的组成成分发生了很大变化，混凝土强度检测技术得到了很大的提高，新型检测技术也在不断发展，现有规范中的混凝土测强曲线有待修正及补充。采用上海地区常用的混凝土原材料，配制强度等级为C20~C60的混凝土试块，进行R值回弹法、Q值回弹法、剪压法和钻芯法等混凝土测强试验，采用数据回归的方法得到各方法的混凝土测强曲线，利用相对标准误差和评价相对误差等指标分析各测强曲线的回归效果，为现有规范的修订提供参考及建议。Abstract: In recent years, great changes have taken place in the raw materials for concrete in Shanghai. Detection technology of concrete compression has been greatly improved and new detection technology has been continuously developed. Thus it is necessary to amend and supplement the concrete strength curve of existing standards. Using the typical raw materials of local area, the experimental work was performed on the detecting concrete compressive strength by R-value rebound method, Q-value rebound method, shear-pressure method and drilled core method. The strength curve of the above-mentioned methods and drilled core method were given by using the method of data regression. Compared with relative standard error and average relative error, the strength curve had the best effect and the highest accuracy. The strength curve was used to provide reference and suggestions for existing standards.
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