单选题:关于粉煤灰路堤的施工,正确的说法是(  )。

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题目内容:
关于粉煤灰路堤的施工,正确的说法是(  )。 A.粉煤灰路堤不可用于高速公路路堤
B.凡是电厂排放的硅铝型低铝粉煤灰都可作为路堤填料
C.粉煤灰路堤比普通路堤自重更大,可以减少软土路堤沉降
D.粉煤灰路堤一般由路堤主体部分、护坡和封顶层以及排水系统等组成

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