1.1 本试验方法涵盖了通过测量压实土壤的固有阻抗来确定非冻结、未结合土壤和土壤骨料混合物的就地特性的程序，例如总密度、重量含水量和相对压实度。 1.1.1 本试验方法中描述的方法和装置旨在用于土方工程的过程质量控制。现场或材料表征不是预期结果。 1.2 单位- 以国际单位制或英寸表示的数值- 磅单位应单独视为标准单位。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。 1.2.1 在处理英寸磅单位时，使用英寸磅单位的重力系统。在该系统中，磅（lbf）表示力（重量）单位，而质量单位为段塞。本标准未给出合理的缓动单元。 1.2.2 在工程专业中，除非涉及动态计算，否则惯例是交替使用表示质量和力的单位。这隐含地结合了两个独立的单位系统，即绝对系统和重力系统。在一个标准中结合使用两个单独的系统是不可取的。使用天平或天平记录质量磅（lbm），或记录密度（lbm/ft） 3. 不应视为不符合本标准。 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舍入指南 D6026 . 1.3.1 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，以满足这些考虑。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 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。 注1: ASTM国际对与本标准提及的任何项目有关的任何专利权的有效性不持任何立场。明确建议本标准的用户，确定任何此类专利权的有效性以及侵犯此类权利的风险完全由其自行负责。 1.5 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 所述方法通过将复阻抗测量数据与经验开发的模型相关联来确定湿密度和重量含水量。通过将土木工程中遇到的典型土壤的电特性与其湿密度和重量含水量（由其他公认方法确定）进行比较，生成了经验模型。 5.2 所述测试方法是一种快速、无损检测技术，可用于确定- 放置土壤和土壤骨料混合物的总密度和重量含水量，并测定干密度。 5.3 该方法可用于施工中使用的压实土壤和土壤骨料混合物的质量控制和验收，也可用于研究和开发。无损性允许在单个测试位置进行重复测量，并对结果进行统计分析。 注2: 本标准试验方法产生的结果质量取决于执行该试验的人员的能力以及所用设备和设施的适用性。 符合实践要求的机构 D3740 通常认为能够胜任和客观的采样/测试/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 This test method covers the procedures for determining in-place properties of non-frozen, unbound soil and soil aggregate mixtures such as total density, gravimetric water content and relative compaction by measuring the intrinsic impedance of the compacted soil. 1.1.1 The method and device described in this test method are intended for in-process quality control of earthwork projects. Site or material characterization is not an intended result. 1.2 Units— The values stated in either SI units or inch-pound 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. 1.2.1 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 in this standard. 1.2.2 In the engineering profession, it is customary practice to use, interchangeably, units representing both mass and force, unless dynamic calculations are involved. This implicitly combines two separate systems of units, that is, the absolute system and the gravimetric system. It is undesirable to combine the use of two separate systems within a single standard. The use of balances or scales recording pounds of mass (lbm), or the recording of density in lbm/ft 3 should not be regarded as nonconformance with this standard. 1.3 All observed and calculated values shall conform to the Guide for Significant Digits and Rounding established in Practice D6026 . 1.3.1 The procedures used to specify how data is collected, recorded, and calculated in this standard are regarded as 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 decrease the number of significant digits of reported data commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in the analysis methods for engineering design. 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. Note 1: ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. 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 The method described determines wet density and gravimetric water content by correlating complex impedance measurement data to an empirically developed model. The empirical model is generated by comparing the electrical properties of typical soils encountered in civil construction projects to their wet densities and gravimetric water contents determined by other accepted methods. 5.2 The test method described is useful as a rapid, non-destructive technique for determining the in-place total density and gravimetric water content of soil and soil-aggregate mixtures and the determination of dry density. 5.3 This method may be used for quality control and acceptance of compacted soil and soil-aggregate mixtures as used in construction and also for research and development. The non-destructive nature allows for repetitive measurements at a single test location and statistical analysis of the results. Note 2: The quality of the result produced by this standard 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 requirements of Practice D3740 are generally considered capable of competent and objective sampling/testing/inspection, and the like. 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 evaluation some of those factors.