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首页> 外文会议>Tenth international conference on superplasticizers and other chemical admixtures 2012 >Modification of the Compressive Strength Requirements for the ASTM C494 Standard on Chemical Admixtures
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Modification of the Compressive Strength Requirements for the ASTM C494 Standard on Chemical Admixtures

机译：修改ASTM C494化学外加剂标准的抗压强度要求

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The original version of the ASTM C494 Standard Specification for Chemical Admixtures for Concrete required that new chemical admixture formulations meet 6-month and 1-year compressive strength criteria in order to be in compliance with this standard. In 2005, the ASTM C09 committee approved that selected types of chemical admixtures could qualify for provisional compliance when a set of statistically determined alternative compressive strength requirements are met. The alternate requirements would allow the new chemical admixture products, normally incorporating newer technologies, to be more readily accepted by those agencies requiring ASTM C494 compliance. Under the auspices of the ASTM C09.23 Sub-committee on Chemical Admixtures, 103 sets of compressive strength data provided by five chemical admixture companies were statistically analyzed to determine the capability of 28-day and 6-month results to predict a later age strength. The results indicate that 6-month and 1-year compressive strength results, expressed as percent of reference mix strength, can be predicted with reasonable precision from early strength results. In particular, 28-day strength (% of ref) can be used to predict 6-month and 1-year strengths (% of ref) within the accuracy of measurement of compressive strength. Furthermore, the data indicate that 1-year compressive strength, as a % of reference mix, is not significantly different from 6-month strength, as a % of reference mix.
机译：ASTM C494混凝土化学外加剂标准规范的原始版本要求新的化学外加剂配方满足6个月和1年抗压强度标准，以便符合该标准。在2005年，ASTM C09委员会批准了当满足一组统计确定的替代抗压强度要求时，选定类型的化学外加剂有资格符合临时法规。替代要求将使通常包含较新技术的新型化学外加剂产品更容易被那些需要符合ASTM C494的机构接受。在ASTM C09.23化学外加剂分委员会的主持下，对五家化学外加剂公司提供的103组抗压强度数据进行了统计分析，以确定28天和6个月结果预测较晚年龄强度的能力。 。结果表明，可以从早期强度结果中以合理的精度预测6个月和1年抗压强度结果，以参考混合强度的百分比表示。特别是，在抗压强度的测量精度范围内，可以使用28天强度（参考值的百分比）来预测6个月和1年强度（参考值的百分比）。此外，数据表明，以参比混合物的百分比表示的1年抗压强度与以参比混合物的百分比表示的6个月抗压强度没有显着差异。

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