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首页> 外文会议>The design and application of controlled low-strength materials (flowable fill) >Heat of Neutralization Test to Determine Cement Content of Soil-Cement or Roller-Compacted Concrete
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Heat of Neutralization Test to Determine Cement Content of Soil-Cement or Roller-Compacted Concrete

机译：中和热试验以确定土壤水泥或碾压混凝土的水泥含量

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A construction control field test method for determining the cement content of freshly mixed soil-cement or roller-compacted concrete (RCC) is discussed. Typical Bureau of Reclamation practice is to establish the most economical mix design requiring the lowest possible cement content that meets both strength and durability specification criteria. Gradation characteristics of available borrow material can dictate mix designs having a significant percentage of plus 4.75-mm (No. 4) sieve-size particles. The ability to determine quickly and accurately the cement content of soil-cement or RCC as it is being placed is critical to help ensure that specification strength and durability requirements are being met. The heat of neutralization test method presented (as modified by the Bureau of Reclamation) has been found to be accurate to within + 1 % of actual cement content for mix designs having cement contents of 3 to 16 % and up to 50 % plus 4.75-mm (No. 4) sieve-size particles; does not require the separation of plus 4.75-mm (No. 4) sieve-size material; and cement content determinations can be made using durable field equipment within 15 to 20 min. Precision and bias statements have been established for the test method in accordance with the ASTM Practice for Conducting an Interlaboratory Test Program to Determine the Precision of Test Methods for Construction Materials (C 802) and the ASTM Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials (C 670) and are presented.
机译：讨论了一种用于确定新拌水泥土或碾压混凝土（RCC）水泥含量的施工控制现场试验方法。开垦局的典型做法是建立最经济的混合料设计，要求水泥含量尽可能低，同时满足强度和耐用性标准。可用的借用物料的分级特性可以决定混合设计的比例，其中显着百分比为4.75毫米（第4号）筛孔大小的颗粒。快速准确地确定放置的水泥或RCC的水泥含量的能力对于帮助确保满足规格强度和耐久性要求至关重要。对于水泥含量为3％至16％且最高为50％加上4.75-5％的混合料设计，发现提出的中和热测试方法（由开垦局修改）精确到实际水泥含量的±1％以内。毫米（第4号）筛孔大小的颗粒；不需要分开加4.75毫米（第4号）筛孔大小的材料；水泥含量的测定可以使用耐用的现场设备在15至20分钟内完成。根据ASTM实施实验室间测试程序以确定建筑材料测试方法的精度（C 802）和ASTM准备测试方法的精度和偏差声明的实践，已经为测试方法建立了精度和偏差声明。用于建筑材料（C 670）并进行介绍。

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