Improving Variability and Precision of Air-Void Analyzer (AVA) TestResults and Developing Rational Specification Limits
Improving Variability and Precision of Air-Void Analyzer (AVA) TestResults and Developing Rational Specification Limits
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发表时间：
2008-06
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通讯作者：
Kejin Wang;Mohamed Mohamed-Metwally-Mohamed;F. Bektaş;J. Grove
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作者：
Kejin Wang;Mohamed Mohamed-Metwally-Mohamed;F. Bektaş;J. Grove
自20世纪90年代引入空气空洞分析仪（AVA）以来，美国进行了各种研究以应用该技术。在以下方面提出了许多关切：(a) AVA测试的变化，(b) AVA与其他标准测量之间的关系，以及(c) AVA规格限制。因此，AVA测试在具体实践中的应用是非常具有挑战性的。本课题的研究目标是降低AVA试验结果的变异性，提高其精度，并利用AVA试验参数制定控制混凝土冻融损伤的合理规范限值。本项目分为三个阶段：(1)第一阶段——文献检索和现有AVA数据分析（2007年6月- 2008年8月）；(2)第二阶段——AVA测试程序和规范修改；(3)第三阶段——AVA实地研究和规范改进。本研究报告介绍第一阶段研究的主要活动和结果，并建议第二阶段研究的主要任务。第一阶段研究的主要活动包括：进行文献检索，收集和审查可用的AVA数据，完成收集到的AVA数据的统计分析，并在实验室进行一些AVA试验测试。结果表明，AVA是一种既省时又经济的混凝土质量控制工具。然而，为了在具体实践中正确实施AVA技术，AVA设备的稳健性、测试程序和由此产生的互操作需要进一步改进。
Since air-void analyzer (AVA) was introduced in the 1990s, various studies have been conducted in the United States to apply this technology. Many concerns are raised on (a) the variation of the AVA tests, (b) the relationship between AVA and other standard measurements, and (c) AVA specification limits. The application of AVA tests in concrete practice is therefore very challenging. The goals of the present research project are to reduce variability and improve precision of AVA test results and to develop rational specification limits for controlling concrete freezing and thawing (F-T) damage using the AVA test parameters. This project consists of three phases: (1) Phase 1—Literature search and analysis of existing AVA data (June 2007–August 2008), (2) Phase 2—AVA testing procedure and specification modification, (3) Phase 3—Field study of AVA and specification refinement. In the present research report, the major activities and findings of the Phase 1 study are presented, and the major tasks for the Phase 2 study are recommended. The major activities of the Phase 1 study included the following: performing a literature search, collecting and reviewing available AVA data, completing a statistical analysis on collected AVA data, and carrying out some AVA trial tests in lab. The results indicate that AVA is a time- and cost-effective tool for concrete quality control. However, robustness of the AVA equipment, test procedures, and resulting interoperations need further improvement for a proper implementation of the AVA technology in concrete practice.