(一)引言粉煤灰的细度,是影响其活性的最主要因素。通常用比表面积和筛余量来表示。这二种表示方法与活性之间的关系,已有不少研究,对于前者,有人认为粉煤灰中含碳量会严重干扰其透气法比表面积的测定,因而不可靠,但也有人指出在比表面积与活性之间具有良好的相关性。在我们以往的研究中,曾发现粉煤灰透气法比表面积的测定往往不能顺利进行。因此,在对粉煤灰的强度和各项理化性质之间 (I) Introduction The fineness of fly ash is the most important factor affecting its activity. It is usually expressed in terms of specific surface area and sieve residue. There are many studies on the relationship between these two methods and activity. For the former, some people think that the carbon content in fly ash will seriously interfere with the determination of the specific surface area of ​​the gas permeable method, so it is not reliable, but it was also pointed out that There is a good correlation between specific surface area and activity. In our previous studies, it has been found that the measurement of the specific surface area of ​​fly ash in air permeability often fails. Therefore, between the strength and physicochemical properties of fly ash