Study on Application of Blending Ground Stone Dust with Unqualified Fly Ash in RCC
The content of f-CaO in high calcium fly ash (FA) produced by Kaiyuan Xiaolongtan Power Station reached at 9. 32％ and that of S03 was higher than the State Criterion. The content of f-CaO and S03 can be effectively reduced by blending ground stone dust (GSD) with FA, so the illegibility of cement soundness can be avoided. The study showed that:(1) Ground in trial ball mill for 60min, the river sand can be made into GSD with fineness (45um) of 12. 8％ and specific surface area of 12656 cm2/g; (2) While GSD was blended with FA, the 28 d compressive strength declines with the dosage of GSD added, but the 28 d flextural strength increased instead of declining, and the 28 d flextural strength was the highest at the dosage of 30％; (3) Cement soundness was up to State Criterion when the blending rate of GSD ranges from 20％ to 50％ in the mineral admixture with which dosage was 60％ in the cement paste; (4) GSD ground for 60min. Had the best performance in C18020 RCC; (5) As to different GSD blending rate, 30％ was best with only a 5. 4％ loss of 90 d compressive strength; (6) Because of the lower proportion of SD in river sand, the workability and density of concrete is poor. The performance of the concrete can be evidently improved if 10％ sand was replaced by GSD. The 90d compressive strength can also be increased by 35. 5％.
ground stone dust unqualified fly ash blending RCC application
Chen Guoxin Xing Youhong Huang Guohong Lu Anqi Zhu Yeran
Nanjing Hydraulic Research Institute,Hujuguan 34＃, Nanjing 210024, China Nanjing Hydraulic Research Institute,Hujuguan 34＃,Nanjing 210024, China Nanjing Hydraulic Research Institute,Hujuguan 34＃, Nanjing 210024,China
国际会议
第五届碾压混凝土坝国际研讨会(The Fifth International Symposium on Roller Compacted Concrete(RCC))
贵阳
英文
405-409
2007-11-02（万方平台首次上网日期，不代表论文的发表时间）