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首页> 外文期刊>Bulletin des Laboratoires des Ponts et Chaussees >Amelioration de l'essai d'ecoulement des sables
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Amelioration de l'essai d'ecoulement des sables

机译：砂流测试的改进

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摘要

This study's objective is twofold: to gain an understanding of the causes of poor reliability in the sand flow test with a 0.08/2-mm particle size fraction, as set forth in French standards NF P 18-564 and European standards NF EN 933-6; and to propose an economical and efficient solution for improving this reliability. The study indicates that 90% of inter-laboratory variance, which is responsible for poor testing reliability, can be explained by uncertainty as the operator introduces a sand sample into the flow unit. In seeking to reduce this level of uncertainty, a prototype feeder was designed and then evaluated. Test results showed that the presence of a feeder served to decrease this uncertainty to a negligible amount. By using the prototype feeder developed at the CECP prototype center in Rouen (Normandy), it would seem that reproducibility of the sand flow test may be divided by a factor of three. This finding, which solidly meets category requirements stipulated in both French and European product standards (XP P 18-540 and NF EN 13043, respectively), will be the focus of an upcoming validation effort within the scope of a cross-testing experiments.
机译：这项研究的目的是双重的：按照法国标准NF P 18-564和欧洲标准NF EN 933-的规定，了解粒径为0.08 / 2mm的沙流测试中可靠性不佳的原因。 6;并提出一种经济有效的解决方案来提高这种可靠性。研究表明，由于操作员将砂样引入流动单元，不确定性可以解释实验室间差异的90％，这是导致测试可靠性差的原因。为了减少这种不确定性，设计了原型进料器，然后进行了评估。测试结果表明，进料器的存在可将这种不确定性降低到可以忽略的程度。通过使用在鲁昂（诺曼底）CECP原型中心开发的原型进料器，砂流测试的可重复性似乎可以除以三。这一发现完全符合法国和欧洲产品标准（分别为XP P 18-540和NF EN 13043）中规定的类别要求，将成为交叉测试实验范围内即将进行的验证工作的重点。

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