1.1 本试验方法涵盖了测定新拌水泥中水泥含量的程序。该试验方法可用于测定含有3%至16%水泥的试样的水泥含量。本试验方法适用于含有高达55%加4.75 mm（4号）筛孔尺寸颗粒的水泥土，最大粒径为75 mm（3英寸）。它不应用于确定这些混合物的F级火山灰含量。 1.2 所有观察值和计算值应符合《规程》中规定的有效数字和四舍五入的准则 D6026 . 1.2.1 本试验方法中用于规定如何收集/记录和计算数据的程序被视为行业标准。此外，它们代表了通常应保留的有效数字。所使用的程序不考虑材料变化、获取数据的目的、特殊目的研究或对用户目标的任何考虑；通常的做法是根据这些考虑增加或减少报告数据的有效数字。 考虑工程设计分析方法中使用的有效数字超出了本测试方法的范围。 1.3 单位-- 以国际单位制或英寸-磅单位表示的值[在括号中]应单独视为标准。每个系统中所述的值可能不是完全等效的；因此，每个系统都应独立使用。 1.3.1 转换后的英寸-磅单位使用重力单位制。在这个系统中，磅（lbf）代表力（重量）的单位，而质量的单位是蛞蝓。 除非涉及动态（F=ma）计算，否则不会给出转换后的段塞单元。 1.3.2 工程/建筑行业的常见做法是同时使用磅来表示质量单位（lbm）和力单位（lbf）。这隐含地结合了两个独立的单位系统；即绝对系统和引力系统。从科学上讲，在一个标准中结合使用两套单独的英寸-磅单位是不可取的。如前所述，本标准包括英寸重力系统- 磅单位，不使用/显示质量单位。但是，使用天平或天平，记录质量磅（lbm）或以lbm/ft为单位记录 3. 不应被视为不符合本标准。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 第节给出了具体的预防措施 8. . 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 =====意义和用途====== 5.1 该程序提供了一种可靠确定土壤水泥含量的方法- 该程序可用于确定土壤水泥的水泥含量，以实际水泥含量的干样质量计为±1个百分点，这通常适用于大多数施工控制应用。 5.2 缓冲溶液与水泥中的氢氧化钙反应，并可能与土壤中的钙质物质反应产生热量。钙质土壤的任何反应都包含在校准曲线中，但当水泥含量低于3%时，温度反应通常不足以获得可靠的结果。 由于F级火山灰可能不含任何用于反应的氢氧化钙，因此本试验方法将无法确定混合物中F级火山灰质的百分比。 注1: 本试验方法产生的结果质量取决于执行人员的能力以及所用设备和设施的适用性。符合实践标准的机构 D3740 通常认为能够进行合格和客观的测试/取样/检查等。本标准的使用者应注意遵守惯例 D3740 其本身并不能确保可靠的结果。可靠的结果取决于许多因素；实习 D3740 提供了一种评估其中一些因素的方法。

1.1 This test method covers the procedure for determining the cement content of fresh soil-cement. This test method can be used for determining the cement content of specimens that contain 3 % to 16 % cement. This test method is appropriate for soil-cement containing up to 55 % plus 4.75 mm (No. 4) sieve-size particles with a maximum particle size of 75 mm (3 in.). It should not be used for determining the Class F pozzolan content of these mixtures. 1.2 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026 . 1.2.1 The procedures used to specify how data are collected/recorded and calculated in this test method are regarded as the industry standard. In addition, they are representative of the significant digits that should generally be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives; it is common practice to increase or reduce significant digits of reported data commensurate with such considerations. It is beyond the scope of this test method to consider significant digits used in analysis methods for engineering design. 1.3 Units— The values stated in SI units or inch-pound units [presented in brackets] are to be regarded separately as the standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. 1.3.1 The converted inch-pound units use the gravitational system of units. In this system, the pound (lbf) represents a unit of force (weight), while the unit for mass is slugs. The converted slug unit is not given, unless dynamic (F = ma) calculations are involved. 1.3.2 It is common practice in the engineering/construction profession to concurrently use pounds to represent both a unit of mass (lbm) and of force (lbf). This implicitly combines two separate systems of units; that is, the absolute system and the gravitational system. It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard. As stated, this standard includes the gravitational system of inch-pound units and does not use/present the slug unit for mass. However the use of balances or scales, recording pounds of mass (lbm) or recording in lbm/ft 3 shall not be regarded as nonconformance with this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 8 . 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This procedure provides a means for reliably determining the cement content of soil-cement in approximately 15 to 20 min. The procedure can be used to determine the cement content of soil-cement to ±1 percentage point by mass of dry sample of the actual cement content, that is generally adequate for most construction control applications. 5.2 The buffer solution reacts with the calcium hydroxide in the cement and may react with calcareous material in the soil to produce heat. Any reaction from calcareous soil is accommodated in the calibration curve but below 3 % cement content there is usually insufficient temperature reaction for reliable results. Because Class F pozzolan may not contain any calcium hydroxide for reaction, this test method will not determine percentage Class F pozzolan in the mix. Note 1: The quality of the result produced by this test method is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection/ and the like. Users of this standard are cautioned that compliance with Practice D3740 does not in itself ensure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors.