本规程涵盖了燃煤飞灰（通常但不限于非自硬）的使用 灰烬）作为路堤施工的填充材料。经过适当处理后，在准备好的坡度上拖运、摊铺和压实至合适的高度 密度标准，燃煤粉煤灰单独使用，或与传统土壤骨料或水泥混合使用 其他经批准的骨料材料有望提供比正常重量轻的填料 材料（85至100 pcf，1360至1600 kg/m3），具有足够的稳定性和负载支撑，可作为 公路或公路路堤。 本规程中描述的技术使用安全壳护道、覆盖填充材料和 有时需要一个衬垫和渗滤液系统来隔离飞灰和任何产生的废水。这是一个 对使用粉煤灰作为填料引起的环境问题采取保守的方法，并且可能不会 所有飞灰或所有监管要求都需要。本规程承认，由于飞灰是电力和电力行业燃煤的副产品 蒸汽发电设施、各种州、县和地方环境法律和法规 如果将粉煤灰用作替代路堤材料，则适用相关规定。 粉煤灰的几个方面 确定了环境问题。因此，本标准讨论了要素 如不透水层和渗滤液收集，根据 影响拟议安装的环境法规。

This practice covers the use of coal combustion fly ash (typically but not limited to non-selfhardening ash) as a fill material for the construction of embankments.When properly processed, hauled, spread, and compacted on a prepared grade to appropriate density standards, coal combustion fly ash used alone, or blended with traditional soil aggregate or other approved aggregate materials, can be expected to provide a lighter-than-normal weight fill material (85 to 100 pcf, 1360 to 1600 kg/m3) with adequate stability and load support for use as road or highway embankment.The technique described in this practice uses containment berms, cover fill material, and sometimes a liner and leachate system to isolate the fly ash and any resulting effluent. This is a conservative approach to the environmental issues raised by the use of fly ash as fill, and may not be required for all fly ashes or for all regulatory requirements.This practice recognizes that since fly ash is a by-product of the burning of coal in electricityand steam-generating facilities, various state, county, and local environmental laws and regulations apply if fly ash is used as an alternative embankment material. Aspects of fly ash that are of environmental concern are identified. Therefore, this standard discusses elements such as impermeable layers and leachate collection, as they may be required according to the environmental regulations affecting the proposed installation.