Abstract: The high early compressive strength geopolymer is prepared by using red-mud and fly ash as the main raw materials, adding suitable water glass as alkali exciting agent. Influence of alkali exciting agent to the development of compressive strength of the samples was discussed in this paper. The non-sintering materials were prepared by using silver sand as the aggregate cementing with red-mud and fly ash geopolymer. When adding amounts of red-mud are between 60%-70%, the compressive strength of all samples in the third day is higher than 10 MPa, they satisfy the demand of MU10 high quality for free-bearing wallboard materials. The mechanism of cementing reaction is also discussed briefly.

Key words: geopolymer;red-mud;non-sintering;compressive strength;reaction mechanism