Estimation of Air-entraining Content of Fly Ash Mortar
The applicability of fly ash recently used in Japan was evaluated in this paper. The characteristics of 45 batches of fly ashes obtained in Japan in 2007 are evaluated and the results show that there were large differences in physical characteristics due to the degree of grinding of the coal and the chemical composition of coal ash. The recently evaluatiion method of fly ash in Japan is not considered to be suitable by change of methylene blue color adsorption because the chemical characteristics of ORP (oxidation reduction potential) are different in each fly ashes. The results of the measurement of airentraining content in mortar show that there was a tendency when the air-entraining capability reduced with the increase of the igneous loss value, the brain specific surface area value, and the BET specific surface area value. The adsorption character of the air-entraining agent can be expressed approximately by the BET adsorption formula. There was a good correlation between the air-entraining content and the BET specific surface area of fly ash, cement and fine aggregate. The high purity of limestone crushed sand with a low specific surface area is suitable for accurately evaluation for higher specific surface area of fly ash.
fly ash air-entraining capability BET specific surface area oxidation reduction potential methylene blue adsorption capacity
Quart Hong-zhu Tanosaki lakao Kasami Hideo
Department oj Architecture andCivil Engineering, Qingdao Agricultural University, Qingdao, 266109, C Taiheiyo cement corporation, Sakura, 285-0802, Japan Association for Building Research, Tokyo 108-0014, Japan
国际会议
济南
英文
224-228
2010-05-09（万方平台首次上网日期，不代表论文的发表时间）