This article uses raw/fine fly ash as raw material,and by adding an appropriate amount of slag and cement clinker,sodium silicate is used as an alkaline activator to prepare alkali activated fly ash based cementitious material at room temperature.The influence of ratio of raw fly ash to fine fly ash,NaOH content in alkali activator,as well as slag and alkali activator content on the compressive strength of alkali activated fly ash based cementitious material was analyzed by using orthogonal experimental methods,combined with XRD and SEM experiments to characterize the samples.The results showed that,when the ratio of raw fly ash to fine fly ash was l:3,NaOH accounted for 15％of the alkali activator,the slag content was 20％of the solid waste,and the alkali activator content was 13％of the total liquid content,the compressive strength at the age of 3d,28d,60d could reach 19.6 MPa,29.0 MPa,and 35.5 MPa,respectively.The Al—O bond and Si—O bond in the fly ash and slag were broken,and the alumi-nosilicate C-A-S-H gel and C-S-H gel were recombined.
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