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Modification of the Compressive Strength Requirements for the ASTM C494 Standard on Chemical Admixtures

机译：改进ASTM C494标准的化学混合物的抗压强度要求

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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混凝土化学综合征标准规范的原始版本要求新的化学混合物配方符合6个月和1年的抗压强度标准，以符合本标准。 2005年，ASTM C09委员会批准，当满足一套统计决定的替代抗压强度要求时，所选类型的化学混合物可以有资格获得临时遵守情况。备用要求将允许新的化学掺合产品，通常纳入较新技术，这些代理商更容易被需要ASTM C494遵从性的机构接受。在ASTM C09.23化学加混合器委员会的主持下，五种化学加称量公司提供的103套压缩强度数据在统计上分析，确定28天和6个月的结果，以预测后期的年龄强度。结果表明，6个月和1年的压缩强度结果，表达为参考混合强度的百分比，可以通过早期强度的结果，合理精确地预测。特别是，28天的强度（REF的％）可用于预测抗压强度测量的准确性内的6个月和1年的优势（Ref的百分比）。此外，数据表明，作为参考混合物的百分比，1年的抗压强度与6个月的强度没有显着差异，作为参考混合物的百分比。

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