1.1 这些试验方法包括测定硬化土壤-水泥试样反复冻融产生的土壤-水泥损失、含水量变化和体积变化（膨胀和收缩）的程序。在水泥水化之前，使用试验方法中描述的压实程序将试样在模具中压实至最佳含水量下的最大密度 D558/D558M . 1.2 根据土壤级配，包括以下两种试验方法，用于制备成型试样和成型试样的材料: 章节 试验方法A ，使用通过4.75毫米[4号]筛的土壤材料。当100%的土壤样品通过4.75毫米[4号]筛时，应使用该方法。 8.1 试验方法B 使用通过19.0毫米[0.75英寸]筛的土壤材料。当部分土壤样品保留在4.75毫米[4号]筛。该试验方法只能用于在19.0 mm[0.75英寸]筛上残留30%或更少的材料 8.2 1.3 所有观察值和计算值应符合实践中制定的有效数字和四舍五入指南 D6026 . 1.3.1 本标准中用于规定如何收集/记录或计算数据的程序被视为行业标准。此外，它们代表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因素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标准的范围。 1.4 单位- 以国际单位制单位或英寸-磅单位[括号内]表示的值应单独视为标准值。每个系统中陈述的值可能不完全等同；因此，每个系统应独立使用。合并两个系统的值可能导致不符合标准。筛子尺寸由质量标准中的标准名称标识 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尺寸。 1.4.1 在处理英磅单位时，使用英磅单位的重力系统。在这个系统中，磅（lbf）代表力（重量）的单位，而质量的单位是块。除非涉及动态（F=ma）计算，否则没有给出合理化的段塞单元。 1.4.2 在工程/建筑专业中，通常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。在一个标准中结合使用两组独立的英寸-磅单位在科学上是不可取的。如上所述，该标准包括英寸-磅单位的重力系统，并且不使用/呈现质量单位。然而，使用记录质量磅(lbm)或以lbm/ft为单位记录密度的天平或秤 3 不应视为不符合本标准。 1.5 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。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法规限制的适用性。 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====== 5.1 这些试验方法用于确定压实土壤-水泥试件对反复冻融的抵抗力。开发这些试验方法是为了与试验方法结合使用 D559/D559M 以及中给出的标准 土壤-水泥实验室手册 3 确定土壤水泥中达到足以抵抗现场风化的硬度所需的最小水泥量。 附注1: 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。符合执业准则的机构 D3740 通常被认为能够胜任和客观的测试/取样/检查。可靠的结果取决于许多因素；实践 D3740 提供了一种评估部分（但不是全部）这些因素的方法。

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 freezing and thawing 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. 8.1 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 those materials that have 30 % or less retained on the 19.0 mm [0.75-in.] sieve 8.2 1.3 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026 . 1.3.1 The procedures used to specify how data are collected /recorded or calculated in this 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 this standard to consider significant digits used in analysis methods for engineering design. 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 may not be exact equivalents; therefore, 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 unit; 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 ====== 5.1 These test methods are used to determine the resistance of compacted soil-cement specimens to repeated freezing and thawing. These test methods were developed to be used in conjunction with Test Methods D559/D559M and criteria given in the Soil-Cement Laboratory Handbook 3 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 facility used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some, but not all, of those factors.