The results showed that there were mainly three methods: one was adding the activated pozzolana to gypsum; the other was adding organic water repellents; thirdly, the two materials (the activated pozzolana and organic water repellents) were added to gypsum at some rate.

Research on the Pozzolanic Activity of the Shaft-kiln Calcined Coal Gangue;

Investigation on pozzolanic activity of perlite powder;

Experimental study on pozzolanic activity of magnesium slag;

There is no appropriate method or uniform standard for evaluating the pozzolanicity of CFB sulphur-fixed coal ashes,leading to difficulty in use of it as building material,because CFB sulphur-fixed coal ash has higher content of f-CaO and SO_3 than that of ordinary ash.

Results show that the CaO absorption capability and pozzolanic reactivity of AFA are obviously higher than that of FA.

Aiming at the problem of the traditional methods, a fast method to determine volcanic reactivity of tailings was put forward.

The influence of the pH value of Ca(OH)2+NaOH solution to soluble SiO2 content in fly ash was studied by the boiling reflux method, and the relationship between soluble SiO2 content and the pozzolanic activity index was discussed.