Does anyone have any experience with using coal fly ash as a soil stabilizer? If so, did you use ash from lignite or bituminous coal? How did it work? We have a yard that has an ongoing problem with frost boils and even after getting worked up a bit and dried out will promptly turn spongy. Unfortunately hauling everything out and starting over is not an option. Someone recommended fly ash as a stabilizer. How much will we need to put down and what's the life span of it?
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