Experimental Study On New Methods Of Improving The Activity And Cooling Rate Of CFBA

This thesis focused on the experimental study on new methods of improving the activity of CFB bottom ash as appendage to concrete, mainly includes the activated mechanism of CFB bottom ash, method of cooling directly with controllable water(MCDCW), method of cooling directly with water and wind(MCDWW),and computation of cooling rate of CFB bottom ash. On the basis of the activated mechanism of CFB bottom ash, this experimental study tries to improve the content of vitreous body in bottom ash, the activity of CFBA, and to enhance the erodibility of vitreous body by vapor with high temperature. The experimental study comprises two parts: 1 ) Method of cooling directly with controllable water. CFB bottom ash iscooled by MCDCW without the loss of fine grains, which is different from Method of cooling directly with plenty of water that leads to the loss of fine grains. This part of experiment is focused on the study of the difference between this two cooling styles.2) Method of cooling directly with water and wind. MCDWW may be considered as the admixture of MCDCW and Method of cooling with wind(MCW). Different Cooling Rate is obtained as the change of ratio of water to wind, which leads to the different 28 day's ratio of compressive strength of CFBA R28. And we can get the relationship between the erodibility of vitreous body and the 28 day's ratio of compressive strength of CFBA R28.Kinds of bottom ashes will be got by the different usage of water in the experiment of MCDWW. We can get better Cooling Style with the analysis of scanning electron macrograph, X-ray diffraction patterns, and 28 day's ratio compressive strength of CFBA R28, and find the relationship among R28, content of vitreous body in bottom ash, and Cooling Rate.The Cooling Rate of bottom ash is enhanced greatly by water, which reaches 400 /S, and can't be measured by test with precision. In order to calculate the Cooling Rate of CFBA, the models of MCDCW, MCDWW, and MCW are established, from which we can get the temperature field of CFBA at every moment.