This paper introduces the mix proportion of high fly ash content concrete instead of 30% cement with fly ash and some experiment results of the test examples in laboratory.

The secondary hydration of high fly ash content concrete is slow at the early period and then the velocity of it gradually increase.

This text represents the study on the main performance of HFCC, combining practice data, and makes every effort to find and improve the performance of HFCC, raising their use potentiality actually.