1.1 这些试验方法包括在规定的水泥水化之前压实时，测定水泥土混合物的含水量和密度之间的关系。 1.2 A 0.0333英尺 3. [944厘米 3. ]模具和一个5.50磅力[24.5牛顿或质量为2.5千克]的打夯机从12.0英寸的高度坠落。使用[30.5 cm]，根据土壤级配，涵盖以下两种方法: 小节 试验方法A， 使用通过4号[4.75-mm]筛的土壤材料。当100 % 土壤样本的。 4[4.75-mm]筛 8. 试验方法B ，使用通过 3. / 4. -在中。[19.0-mm]筛。当部分土壤样本保留在4号[4.75-mm]筛上时，应使用该方法。本试验方法仅适用于具有30 % 或更少保留在 3. / 4. -在中。[19.0-mm]筛 9 1.3 单位- 以英寸-磅单位或国际单位表示的数值应单独视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。 将两个系统的值合并可能会导致不符合标准。 1.3.1 在处理英寸磅单位时，使用英寸磅单位的重力系统。在这个系统中，磅（lbf）表示力（重量）的单位，而质量的单位是段塞。除非涉及动态（F=ma）计算，否则未给出缓动单元。 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（lbf）。 这隐含地结合了两个独立的单元系统；也就是说，绝对系统和引力系统。在一个标准中结合使用两套独立的英寸-磅单位在科学上是不可取的。本标准包括以英寸-磅为单位的重力系统，不使用/提供质量单位。然而，使用天平或天平记录磅质量（lbm）或记录密度（lbm/ft） 3. 不应视为不符合本标准。 1.4 所有观察值和计算值应符合实践中确定的有效数字和舍入准则 D6026 . 1.4.1 本标准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。使用的程序不考虑材料变化、获取数据的目的、特殊目的研究或用户目标的任何考虑因素； 通常的做法是增加或减少报告数据的有效位数，以与这些考虑因素相称。考虑工程设计分析方法中使用的有效数字超出了本标准的范围。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 这些试验确定了根据试验方法成型水泥土试样所用的最佳含水量和最大密度（单位重量） D559/D559M 和 D560/D560M . 注1: 因为这些测试与测试方法一起使用 D559/D559M 和 D560/D560M 根据其中引用的标准，该试验在几个方面与试验方法不同 D698 . 本标准和试验方法之间有三个主要区别 D698 . 首先，本标准允许最大粒径为 3. / 4. -在中。[19.0毫米]对于4英寸。[101.6-mm]成型试验方法 D698 允许最大粒径为 3. / 8. -在中。[9.5- mm]用于相同尺寸的模具。其次，本标准允许将获得含水量样本后的剩余材料与其余样本混合，并重新用于下一次测定。试验方法 D698 不允许重复使用材料。第三，本标准允许将材料保留在 3. / 4. -在中。[19.0-mm]并通过3-in。[75 mm]被丢弃（剥皮技术），并用同等质量的材料代替 3. / 4. -在中。[19.0-mm]筛，并保留在4号[4.75-mm]筛上。试验方法 D698 不允许使用头皮和置换技术。 注2: 本标准产生的结果的质量取决于执行该标准的人员的能力，以及所用设备和设施的适用性。符合实践标准的机构 D3740 通常认为能够胜任和客观的测试/采样/检查等。本标准的用户应注意遵守惯例 D3740 本身并不能保证可靠的结果。可靠的结果取决于许多因素；实践 D3740 提供了一种评估其中一些因素的方法。

1.1 These test methods cover the determination of the relationship between the water content and the density of soil-cement mixtures when compacted before cement hydration as prescribed. 1.2 A 0.0333-ft 3 [944-cm 3 ] mold and a 5.50-lbf [24.5-N or mass of 2.5-kg] rammer dropped from a height of 12.0 in. [30.5 cm] are used and two methods, depending on soil gradation, are covered, as follows: Sections Test Method A, using soil material passing a No. 4 [4.75-mm] sieve. This method shall be used when 100 % of the soil sample passes the No. 4 [4.75-mm] sieve 8 Test Method B , using soil material passing a 3 / 4 -in. [19.0-mm] sieve. This method shall be used when part of the soil sample is retained on the No. 4 [4.75-mm] sieve. This test method may be used only on materials with 30 % or less retained on the 3 / 4 -in. [19.0-mm] sieve 9 1.3 Units— The values stated in inch-pound units or SI units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.3.1 The gravitational system of inch-pound units is used when dealing with inch-pound units. In this system, the pound (lbf) represents a unit of force (weight), while the unit for mass is slugs. The 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. 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 density in lbm/ft 3 shall not be regarded as nonconformance with this standard. 1.4 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026 . 1.4.1 The procedures used to specify how data are collected/recorded and calculated in this standard 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; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analysis methods for the engineering design. 1.5 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. 1.6 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 These tests determine the optimum water content and maximum density (unit weight) to be used for molding soil-cement specimens in accordance with Test Methods D559/D559M and D560/D560M . Note 1: Since these tests are used in conjunction with Test Methods D559/D559M and D560/D560M and the criteria referenced therein, the test differs in several aspects from Test Method D698 . There are three main differences between this standard and Test Method D698 . Firstly, this standard allows a maximum particle size of 3 / 4 -in. [19.0 mm] for a 4-in. [101.6-mm] mold while Test Method D698 allows a maximum particle size of 3 / 8 -in. [9.5-mm] for the same size mold. Secondly, this standard permits the material leftover after the water content specimen has been obtained to be mixed with the rest of the sample and reused for the next determination. Test Method D698 does not permit the material to be reused. Thirdly, this standard allows the material that is retained on the 3 / 4 -in. [19.0-mm] and passing the 3-in. [75-mm] to be discarded (scalping technique) and replaced with an equal mass of material that passes the 3 / 4 -in. [19.0-mm] sieve and is retained on the No.4 [4.75-mm] sieve. Test Method D698 does not permit the scalp and replacement technique. Note 2: The quality of the result produced by this standard 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/etc. Users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors.