Abstract: Geopolymer is a new type of binding materials with good performance composed of inorganic silicon aluminum materials and alkaline solution. Water glass solutions were made with different modulus and solid content,and the alkali-activated effect on fly ash-slag system were investigated. The influence of high temperature on mechanical property was studied. The results show water glass with modulus of 1. 4 and solid content of 25% is optimal and high temperature curing contributes to mechanical property improvement.

Key words: geopolymer;fly ash;slag;water glass;high temperature curing