| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a method with which an activity index of fly ash for concrete specified by JIS A 6201(1999) can be known in a short time. <P>SOLUTION: An electroresistance value of a fly ash hardened body obtained by a pozzolanic reaction of fly ash for concrete within the material age of seven days or, preferably, of three days is measured and on the basis of a correlative relationship between a predetermined activity index and the electroresistance value, an activity index of fly ash for concrete is determined. It is preferable that a curing temperature of the flay ash hardened body is 20 to 80°C, and it is also preferable that the electroresistance value is measured according to the tetrapolar circuit method. <P>COPYRIGHT: (C)2012,JPO&INPIT |
