Effects of Grade III Fly Ash with Different Amount and Fineness on Cement Strength Development

In order to utilize the great quantity of grade Ⅲ fly ash with complicated composition,poor homogeneity and low activity,the effects of amount and fineness of the grade Ⅲfly ash on strenght development of Portland.The results showed that there were a rational fineness and suitable proportion amount of grade Ⅲ fly ash in Portland cement and ordinary Portland cement to further develop the activity of the fly ash.When the amounts of admixture of grade Ⅲ fly ash was less 5% or in the range of 10%~15%,the suitable fineness was about 500 m2/kg or 600 m2/kg respectively.