1.1 这些试验方法涵盖了确定硬化水泥土试样反复润湿和干燥产生的水泥土损失、含水量变化和体积变化（膨胀和收缩）的程序。在水泥水合之前，使用试验方法中描述的压实程序，在最佳含水量下将试样在模具中压实至最大密度 直径558米/直径558米 . 1.2 根据土壤级配，涵盖了两种测试方法，用于制备模塑试样和模塑试样的材料，如下所示: 小节 试验方法A ，使用通过4.75-mm[4号]筛的土壤材料。 当100%的土壤样本通过4.75-mm【4号】筛时，应使用此方法。 7. 试验方法B ，使用通过19.0毫米[0.75英寸]的土壤材料。 ]筛子。 当部分土壤样本保留在4.75-mm【4号】筛上时，应使用此方法。 本试验方法仅适用于19.0 mm[0.75 in.]筛上残留30%或更少的材料。 8. 1.3 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 ，除非被本试验方法取代。 1.3.1 用于规定如何在标准中收集/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； 并且通常的做法是增加或减少报告数据的有效数字以与这些考虑相称。考虑工程数据分析方法中使用的有效数字超出了这些测试方法的范围。 1.4 单位-- 以国际单位制或英寸-磅单位表示的值[括号内]应单独视为标准值。每个系统中规定的值应独立使用。将两个系统的值结合起来可能会导致不符合标准。筛孔尺寸由规范中的标准名称标识 E11 括号中给出的替代名称仅供参考，并不代表不同的标准筛孔尺寸。 1.4.1 英寸的引力系统- 处理英寸-磅单位时使用磅单位。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，否则不会给出合理化的段塞单元。 1.4.2 工程/建筑行业的常见做法是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-磅单位的重力系统，不使用/呈现质量的段塞单位。但是，使用天平或天平记录质量磅（lbm）或记录密度（lbm/ft） 3. 不应被视为不符合本标准。 1.5 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。 1.6 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====== 4.1 这些试验方法用于确定压实土壤的阻力- 将水泥试样反复润湿和干燥。这些测试方法是为了与测试方法结合使用而开发的 D560/D560米 标准见 水泥土实验室手册 4. 确定土壤水泥中所需的最小水泥量，以达到足以抵抗现场风化的硬度。 注1: 本标准产生的结果的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 These test methods cover procedures for determining the soil-cement losses, water content changes, and volume changes (swell and shrinkage) produced by repeated wetting and drying of hardened soil-cement specimens. The specimens are compacted in a mold, before cement hydration, to maximum density at optimum water content using the compaction procedure described in Test Methods D558/D558M . 1.2 Two test methods, depending on soil gradation, are covered for preparation of material for molding specimens and for molding specimens as follows: Sections Test Method A , using soil material passing a 4.75-mm [No. 4] sieve. This method shall be used when 100 % of the soil sample passes the 4.75-mm [No. 4] sieve. 7 Test Method B , using soil material passing a 19.0 mm [0.75-in.] sieve. This method shall be used when part of the soil sample is retained on the 4.75-mm [No. 4] sieve. This test method may be used only on materials with 30 % or less retained on the 19.0-mm [0.75-in.] sieve. 8 1.3 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026 , unless superseded by this test method. 1.3.1 The procedures used to specify how data are collected/recorded and calculated in the standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should 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 these test methods to consider significant digits used in analysis methods for engineering data. 1.4 Units— The values stated in either SI units or inch-pound units [presented in brackets] are to be regarded separately as standard. The values stated in each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Sieve size is identified by its standard designation in Specification E11 . The alternative designation given in parentheses is for information only and does not represent a different standard sieve size. 1.4.1 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 rationalized slug unit is not given, unless dynamic (F = ma) calculations are involved. 1.4.2 It is common practice in the engineering/construction profession to 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 density in lbm/ft 3 shall not be regarded as nonconformance with this standard. 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 ====== 4.1 These test methods are used to determine the resistance of compacted soil-cement specimens to repeated wetting and drying. These test methods were developed to be used in conjunction with Test Methods D560/D560M and criteria given in the Soil-Cement Laboratory Handbook 4 to determine the minimum amount of cement required in soil-cement to achieve a degree of hardness adequate to resist field weathering. Note 1: 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 ensure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors.