1.1 本规程涵盖了使用自胶结粉煤灰稳定土壤和类土材料用于道路应用、处理膨胀路基或有机路基以及限制建筑物下方填土沉降的设计程序。本方法涵盖的粉煤灰包括规范中所述的自胶结粉煤灰 D5239 . 1.2 自胶结粉煤灰的测试和工程实践类似于普遍接受的使用粉煤灰和其他需要石灰的火山灰稳定土壤的实践。 1.3 本规程中的试验方法适用于表征 现场 混合自- 胶结粉煤灰稳定材料。遵循实践 D75/D75M 用于采样目的。还有其他相关的飞灰稳定标准。实践 D5239 可用于表征用于土壤稳定的一般类型的粉煤灰。规格 C593型 可用于评估需要石灰土稳定的粉煤灰和其他火山灰的性能。指导 E2277年 可用于表征结构填料中粉煤灰和底灰的特性以及相关设计和施工注意事项。 1.4 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。 1.5 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 本实践提供了一组用于执行一个或多个特定操作的说明。本文件不能取代教育或经验，应与专业判断一起使用。并非本惯例的所有方面都适用于所有情况。本ASTM标准不代表或取代必须根据其判断给定专业服务的充分性的谨慎标准，也不应在不考虑项目的许多独特方面的情况下应用本文件。 本文件标题中的“标准”一词仅表示该文件已通过ASTM共识程序获得批准。 1.7 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====== 4.1 自胶结粉煤灰是稳定土壤、再生路面材料和路面砾石的合适材料。飞灰稳定化可以改善性能，包括增加刚度、强度和冻结- 解冻耐久性；降低导水性、可塑性和膨胀性；并加强对土壤压缩性和水分的控制。粉煤灰稳定材料（FASM）可用于道路施工，例如施工期间的工作平台、稳定路基、底基层和基层。粉煤灰稳定也可用于限制建筑物下方填料的沉降。 4.2 本规程适用于自胶结粉煤灰，可单独使用或与其他稳定外加剂一起使用，以改善土壤性质。 4.3 本规程描述了可能适用于自密实土和类土材料稳定的独特设计考虑因素- 胶结粉煤灰。特定材料的稳定要求可能因当地条件或稳定材料的预期用途或两者而有所不同。 4.3.1 这种做法并不是为了限制稳定设计的灵活性。粉煤灰稳定的成功程度在很大程度上取决于土壤、粉煤灰和其他添加剂的特定组合以及所用的施工程序。设计工程师负责选择合适的材料、适用的测试、验收标准和规范。 4.4 本规程中的试验方法旨在测定FASM的机械性能。 利用自胶结粉煤灰改善力学性能的表征将有助于评估粉煤灰稳定材料。 4.5 自胶结粉煤灰在岩土工程应用中的使用可能受到州和地方规范的管制。应参考规范。

1.1 This practice covers procedures for the design of stabilization of soil and soil-like materials using self-cementing coal fly ash for roadway applications, treatment of expansive subgrade or organic subgrade, and limiting settlement of fills below buildings. The coal fly ash covered in this method includes self-cementing fly ashes described in Specification D5239 . 1.2 The testing and engineering practices for self-cementing coal fly ash are similar to generally accepted practices for soil stabilization with fly ash and other pozzolans that require lime. 1.3 The test methods in this practice are applicable to the characterization of mechanical properties of in situ mixed self-cementing fly ash stabilized materials. Follow Practice D75/D75M for sampling purposes. There are other related fly ash stabilization standards. Practice D5239 can be used to characterize the general types of fly ash for use in soil stabilization. Specification C593 can be used to evaluate the performance of fly ash and other pozzolans that require lime soil stabilization. Guide E2277 can be used to characterize properties of fly ash and bottom ash in structural fills and related design and construction considerations. 1.4 Units— The values stated in SI units are to be regarded as standard. No other units of measure are included in 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 practice offers a set of instructions for performing one or more specific operations. This document cannot replace education or experience and should be used in conjunction with professional judgment. Not all aspects of this practice may be applicable in all circumstances. This ASTM standard is not intended to represent or replace the standard of care by which the adequacy of a given professional service must be judged, nor should this document be applied without consideration of a project’s many unique aspects. The word “Standard” in the title of this document means only that the document has been approved through the ASTM consensus process. 1.7 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 Self-cementing coal fly ashes are suitable materials for the stabilization of soils, recycled pavement materials and road surface gravel. Fly ash stabilization can result in improved properties, including increased stiffness, strength and freeze-thaw durability; reduced hydraulic conductivity, plasticity, and swelling; and increased control of soil compressibility and moisture. Fly ash stabilized materials (FASM) may be used in roadway construction, such as working platforms during construction, stabilized subgrade, subbase, and base layers. Fly ash stabilization can also be used in limiting settlement of fills below buildings. 4.2 This practice is intended for use with self-cementing fly ash that can be used individually or along with other stabilizing admixtures to improve soil properties. 4.3 The practice describes the unique design considerations that may apply to stabilization of soils and soil-like materials with self-cementing coal fly ash. The requirements for stabilization of specific materials may vary due to local conditions or the intended use of the stabilized material, or both. 4.3.1 This practice is not intended to limit the flexibility of design in stabilization. The degree of success attained in stabilization with coal fly ash is highly dependent on the particular combination of soil, fly ash, and other additives and the construction procedure used. The selection of appropriate materials, applicable tests, acceptance criteria, and specification is the responsibility of the design engineer. 4.4 The test methods in this practice are intended for the determination of mechanical properties of FASM. The characterization of mechanical property improvement with self-cementing fly ash will assist in the evaluation of the fly ash stabilized materials. 4.5 The use of self-cementing fly ash in geotechnical engineering applications may be regulated by state and local codes. The codes should be consulted.