1.1 本试验方法提供了一种估算土壤稳定所需土壤石灰比例的方法。本试验方法在通过425μm（40号）筛的土壤上进行。土壤稳定的最佳土壤石灰比例是通过测试稳定土的特定特性（如无侧限抗压强度或塑性指数）来确定的。 1.2 一些高碱性副产品（石灰窑灰、水泥窑灰、电石石灰等）已成功用于稳定土壤。本试验方法不适用于这些材料，任何此类产品都需要进行特定特性试验，如 1.1 . 1.3 本试验方法用于确定导致土壤石灰pH值约为12.4的石灰百分比。 注1: 在25°C和海拔高度的理想实验室条件下，石灰土水溶液的pH值应为12。 4. 1.4 石灰不是所有土壤的有效稳定剂。一些土壤成分，如硫酸盐、磷酸盐、有机物和铁，可能会对土壤石灰反应产生不利影响，使用本试验方法可能会产生错误的结果。 1.5 单位- 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.6 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 . 1.6.1 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。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。考虑工程数据分析中使用的有效数字超出了这些测试方法的范围。 1.7 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。 1.8 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 进行土壤石灰pH值测试是为了表明维持稳定土壤所需反应所需的高pH值所需的土壤石灰比例。该测试源于Eades和Grim。 4. 5.2 性能测试通常在实验室进行，以验证该测试方法的结果。 5.3 本试验方法不会提供与特定土壤的潜在反应性相关的可靠信息，也不会提供在使用指示的石灰百分比处理该土壤时实现的强度增加幅度的信息。 5.4 本试验方法可用于估算生产石灰稳定土所需的熟石灰或生石灰的百分比。常见的候选土壤含有粘土矿物，具有塑性指数 ≥ 10 5.5 农业石灰（压碎的石灰石）不会稳定土壤。 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 This test method provides a means for estimating the soil-lime proportion requirement for stabilization of a soil. This test method is performed on soil passing the 425μm (No. 40) sieve. The optimum soil-lime proportion for soil stabilization is determined by tests of specific characteristics of stabilized soil such as unconfined compressive strength or plasticity index. 1.2 Some highly alkaline by-products (lime kiln dust, cement kiln dust, carbide lime, and so forth) have been successfully used to stabilize soil. This test method is not intended for these materials and any such product would need to be tested for specific characteristics as indicated in 1.1 . 1.3 This test method is used to determine the percentage of lime that results in a soil-lime pH of approximately 12.4. Note 1: Under ideal laboratory conditions of 25°C and sea level elevation, the pH of the lime-soil-water solution should be 12.4. 1.4 Lime is not an effective stabilizing agent for all soils. Some soil components such as sulfates, phosphates, organics, and iron can adversely affect soil-lime reactions and may produce erroneous results using this test method. 1.5 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026 . 1.6.1 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 for engineering data. 1.7 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. 1.8 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 soil-lime pH test is performed as a test to indicate the soil-lime proportion needed to maintain the elevated pH necessary for sustaining the reactions required to stabilize a soil. The test derives from Eades and Grim. 4 5.2 Performance tests are normally conducted in a laboratory to verify the results of this test method. 5.3 This test method will not provide reliable information relative to the potential reactivity of a particular soil, nor will it provide information on the magnitude of increased strength to be realized upon treatment of this soil with the indicated percentage of lime. 5.4 This test method can be used to estimate the percentage of lime as hydrated lime or quicklime needed to produce a lime stabilized soil. Common candidate soils contain clay minerals and have a Plasticity Index ≥ 10. 5.5 Agricultural lime (crushed limestone) will not stabilize soil. 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.