Evaluation of the Air Void Analyzer
Evaluation of the Air Void Analyzer
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DOI：
10.21236/ada583906
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发表时间：
2013-07
期刊：
影响因子：
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通讯作者：
Peter G Bly;L. A. Ventorini
中科院分区：
文献类型：
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作者：
Peter G Bly;L. A. Ventorini
摘要：美国陆军工程师研究与发展中心（ERDC）对空隙分析仪（AVA）进行了评估，以确定该机器准确测量新制备的波特兰水泥混凝土（PCC）的空隙结构的能力。该评估包括在实验室中生产多批PCC，并使用AVA和其他常用的ASTM国际测试程序测量每批PCC的空隙结构。对60批混凝土进行了统计分析，涵盖了一系列的夹带空气和粉煤灰含量。空气含量和粉煤灰置换率分别为3 - 8%和0 - 20%。还评估了所生产的PCC的抗冻性，以验证机器显示性能差的混合物的能力。实验室评价于2011年5月至2012年1月进行。在ERDC材料测试中心，对实验室混合物进行了配料，并制备了混凝土试样并进行了测试。经认证的岩石学家确定，气孔结构符合ASTM C457。使用五种ASTM国际标准测试方法的结果，完成了AVA所进行的空隙结构测量的统计分析。本报告总结了AVA的实验室性能以及所执行试验的相关结论。提供了实施和未来测试的建议。
Abstract : The U.S. Army Engineer Research and Development Center (ERDC) conducted an evaluation of the Air Void Analyzer (AVA) to determine the machine s ability to accurately and precisely measure the air void structure of freshly prepared portland cement concrete (PCC). This evaluation consisted of producing multiple batches of PCC in the laboratory and measuring each batch s air void structure with the AVA and other commonly used ASTM International testing procedures. A statistical analysis was conducted on sixty batches of concrete, covering a range of entrained air and fly ash contents. Air contents and fly ash replacement ranged from 3 to 8 percent and 0 to 20 percent, respectively. The freezethaw resistance of the PCC produced was also evaluated to verify the machine s ability to reveal poorly performing mixtures. The laboratory evaluation was conducted from May 2011 to January 2012. Laboratory mixtures were batched and concrete specimens were prepared and tested at the ERDC Materials Testing Center. A certified petrographer determined the air void structures were in accordance with ASTM C457. A statistical analysis of the air void structure measurements taken by the AVA was completed using the results of five ASTM International standard test methods. This report summarizes the laboratory performance of the AVA, and the pertinent conclusions from the testing performed. Recommendations for implementation and future testing are provided.