Lime fly ash soil, as its name implies, is an organic combination of lime, fly ash and soil, which is mixed, paved and rolled by special equipment to form the bearing layer material for road construction. Its specific name depends on the different soil used, such as lime-fly ash macadam called lime-fly ash macadam soil and lime-fly ash macadam called lime-fly ash macadam soil. Lime and fly ash, as stabilizing materials, are more and more common to be added to natural fine-grained soil or clay, with low price, simple construction, good mechanical properties and water stability, and have become an important method for soil improvement.

Lime-flyash macadam is a semi-rigid structure with strength, which is made of inorganic binder lime, fly ash and graded macadam mixed with a certain amount of water, rolled and maintained.

Lime-fly ash soil consists of lime+fly ash+plain soil, and lime-fly ash macadam consists of lime+fly ash+macadam. Because the raw materials of the two things are different, there are essential differences in nature, construction methods and application parts. The maximum dry density, optimum water content and unconfined compressive strength of the two are different, because they are different things and used in different structures and levels.

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