中美新拌混凝土性能测试方法比对研究

Comparison Study on Chinese and American Performance Test Methods of New Mixed Concrete

本文从标准设置、混凝土密度、混凝土产量、混凝土及砂浆含气量等角度,对中美标准规范中新拌混凝土的性能测试方法进行分析和比较。对比结果发现中美标准对于混凝土密度测试的实验结果处理时,美标要求实验结果精确到1kg/m^3,而中国标准则要求精确到10 kg/m^3;美国标准提出了混凝土产量这一名词,在中国标准中暂无相关规定;在测量混凝土和砂浆含气量时,美国标准针对不同种类的混凝土有对应的测量仪器,而中国标准在含气量测定时仅推荐使用含气量筒。建议我国规范今后修订时,在仪器选择的专业性、实验步骤的严谨性、实验结果的准确性等方面加以改进,促使我国行业标准更加先进、规范、科学,进一步推动行业的进步。

This paper analyzes and compares the performance test methods of new mixed concrete in Chinese and American standards from the perspectives of standard setting, concrete density, concrete yield, air content of concrete, air content of mortar and so on. The comparison results show that when disposing experimental results, the Chinese and American standards toward concrete density test are different. The American standard requires the test results accurate to 1 kg/m^3, but the Chinese standards require the test results accurate to 10 kg/m^3. The term concrete yield is coined by the American standards, There is no relevant regulation in the Chinese standards. When measuring the air content of concrete and mortar, the American standard has correspond measuring method for different kinds of concrete. However, the Chinese standard only recommends to use gas cylinder in the measurement of air content. It is suggested to improve the specialty of instrument selection, the rigor of experimental procedures and the accuracy of experimental results in the future revision of Chinese regulations. To promote our industry standards more advanced, standardized and scientific, we hope this new standard can promote the progress of industry.