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首页> 外文会议>Association of State Dam Safety Officials, Inc. 2002 Annual Conference Sep 8-11, 2002 Tampa, Florida >FINDING FLEXIBILITY IN A RIGID MATERIAL
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FINDING FLEXIBILITY IN A RIGID MATERIAL

机译：在刚性材料中寻找灵活性

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摘要

An RCC quality control program must provide tests that yield qualitative results for verification purposes, while having the flexibility to make minor adjustments to the mix without significant impact to the contractor's production. The Vebe test, although an ASTM specification, is a relatively subjective test. For instance, the project specifications for the North Fork Hughes River Dam allowed for a Vebe time between 19 and 30 seconds; however, these values were selected by the design engineer based on results from the laboratory RCC mix design study. The mix design was performed by personnel and equipment that were different than that utilized during production of the RCC. Furthermore, it is possible for individuals to have varying interpretations of when the formation of a "complete" ring of mortar has vibrated up and around the Vebe surcharge weight per ASTM C 1170. This inconsistency coupled with the use of equipment that may be at the opposite ends of the allowable frequency range for the Vebe vibrating table may account for Vebe times that vary significantly. The results of the moisture content and unit weight from the materials used for the Vebe testing correlated very well with those results obtained by the nuclear density gauges. The field laboratory testing took 24 hours to obtain an accurate moisture content and did not offer the "instantaneous" results that the nuclear density gauge offered at the placement location. The Vebe test can also be a valuable method to confirm the nuclear density testing program.
机译：RCC质量控制程序必须提供产生定性结果的测试，以用于验证目的，同时可以灵活地对混合物进行细微调整，而不会对承包商的生产造成重大影响。 Vebe测试虽然是ASTM规范，但却是相对主观的测试。例如，北叉休斯河大坝的项目规格允许Vebe时间在19到30秒之间；但是，这些值是由设计工程师根据实验室RCC混合设计研究的结果选择的。混合设计是由与RCC生产过程中使用的人员和设备不同的人员和设备执行的。此外，根据ASTM C 1170，对于“完整”砂浆环的形成何时振动并围绕Vebe附加重量，个人可能会有不同的解释。这种不一致之处加上使用了Vebe振动台的允许频率范围的相对两端可能会说明Vebe时间变化很大。 Vebe测试所用材料的水分含量和单位重量的结果与核密度仪获得的结果非常相关。现场实验室测试花费了24小时才能获得准确的水分含量，并且没有提供核密度仪在放置位置提供的“瞬时”结果。 Vebe测试也是确认核密度测试程序的一种有价值的方法。

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