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坍落度仪是美国人达夫·艾布拉姆斯(Duff Abrams)于1913年发明的,至今已有80年的历史了。这种古老的传统仪器,由于其结构简单,操作容易,一直被沿用至今。坍落度法已为世界各国所采用,现将列入国家标准及规范的国家及其标准号码列于表1。
The slump instrument was invented by American Duff Abrams in 1913 and has been in existence for 80 years. This ancient, traditional instrument has been used for years because of its simple structure and easy operation. The slump law has been adopted by various countries in the world. The countries and their standard numbers that are now included in the national standards and specifications are listed in Table 1.