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金属矿山 ›› 2019, Vol. 48 ›› Issue (11): 192-196.

• 综合利用 • 上一篇    下一篇

某钒钛磁铁矿尾矿微粉对自密实混凝土性能的影响

李胜1,2,郑永超1,2,陈旭峰1,2,吝晓然3,黄天勇1,2   

  1. 1. 北京建筑材料科学研究总院有限公司,北京 100041;2. 固废资源化利用与节能建材国家重点实验室,北京 100041;3. 河北工程大学土木工程学院,河北 邯郸 075000
  • 出版日期:2019-11-15 发布日期:2020-01-03
  • 基金资助:

    基金项目:国家重点研发计划项目(编号:2018YFC1903602-1)。

Effect of vanadium-titanium magnetite tailings fine powder on properties of self-compacting concrete

Li Sheng1,2,Zheng Yongchao1,2,Chen Xufeng1,2,Lin Xiaoran3,Huang Tianyong1,2   

  1. 1. Beijing Building Materials Academy of Sciences Research Co., Ltd., Beijing 100041, China; 2. Solid Waste Reuse for Building Materials State Key Laboratory, Beijing 100041, China; 3. College of Civil Engineering, Hebei University of Engineering, Handan 075000, China
  • Online:2019-11-15 Published:2020-01-03

摘要: 为了拓展某钒钛磁铁矿尾矿的应用领域,选用该钒钛磁铁矿尾矿微粉等体积替代粉煤灰制备C30、C35自密实混凝土,研究了其对混凝土工作性能、力学性能、体积稳定性、水化热的影响。结果表明:钒钛磁铁矿尾矿微粉等体积替代粉煤灰,V漏时间减少,扩展度提高,T500用时和J环差值均减少,施工性能得到改善;尾矿微粉混凝土早期强度高于使用粉煤灰配制的混凝土,28 d的混凝土抗压强度达到设计要求,56 d的混凝土体积收缩率都在可控范围内,尾矿微粉胶凝体系7 d累积水化热较粉煤灰胶凝体系略低。

关键词: 钒钛磁铁矿, 尾矿, 微粉, 自密实混凝土, 矿物掺合料

Abstract: In order to expand the application field of a vanadium-titanium magnetite tailings, the C30 and C35 self-compacting concrete were prepared by replacing the fly ash with the same volume of vanadium-titanium magnetite tailings fine powder, and the effect of tailings fine powder on concrete workability, mechanical properties, volume stability and hydration heat were studied. The test results showed that when the tailings fine powder replaced the fly ash with equal volume, the V-leakage time decreased and the divergence increased. The workability improved with the decrease of T500 time and the J-ring difference. The early compressive strength of the tailings fine powder concrete was higher than that of the fly ash concrete, and the 28 d compressive strength met the design requirements. The 56 d concrete volume shrinkage rate is within the controllable range, and the 7 d cumulative hydration heat of the tailings fine powder cementitious system is slightly lower than that of the fly ash.

Key words: Vanadium-titanium magnetite, Tailings, Fine powder, Self-compacting concrete, Mineral admixture