Double ash powders and its preparing method

The present invention discloses double ash powder and its preparation process, and belongs to the field of building material. The double ash powder is prepared with flyash, lime and ardealite in the weight ratio of 65-75 to 23-27 to 5-7. The preparation process includes the following steps: 1. crushing lime and mixing with flyash, ardealite and admixture in certain weight proportion; and 2. grinding the mixture to fineness of 0.08mm with sieving residue less than 12 %. The present invention uses flyash as main material and utilizes flyash has high environment utility and social utility. The double ash powder is cheap cementing material with high strength, and may be used in replace partial cement and whole lime paste to lower environment cost.