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清华大学学报(自然科学版)  2015, Vol. 55 Issue (9): 940-944    
  土木工程 本期目录 | 过刊浏览 | 高级检索 |
蒸养条件下钢渣粗骨料对混凝土的破坏作用
米贵东1, 王强1, 王卫仑2
1. 清华大学 土木系, 北京 100084;
2. 深圳大学 广东省滨海土木工程耐久性重点实验室, 深圳 518060
Destructive effect of steel slag coarse aggregate on the concrete under autoclaved condition
MI Guidong1, WANG Qiang1, WANG Weilun2
1. Department of Civil Engineering, Tsinghua University, Beijing 100084, China;
2. Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen 518060, China
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摘要 为了揭示钢渣粗骨料因安定性不良问题而对混凝土造成破坏的规律, 将钢渣粗骨料和含钢渣粗骨料的混凝土进行了压蒸试验, 研究了钢渣粗骨料含量对不同强度的混凝土的破坏规律。所用钢渣的游离CaO和MgO质量百分数分别为4.83%和4.76%。研究结果显示: 压蒸条件下, 游离CaO和MgO矿物会加速反应使钢渣粗骨料发生膨胀破坏, 含钢渣粗骨料的混凝土可能会因钢渣产生的内部膨胀应力而产生损伤; 钢渣粗骨料占粗骨料的比例越大, 对混凝土造成的损伤越严重; 混凝土的强度越高, 抵抗钢渣粗骨料造成内部膨胀应力的能力越强, 但钢渣粗骨料的含量仍需严格控制, 就该文采用的钢渣而言, 钢渣粗骨料质量百分数不能超过40%。
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米贵东
王强
王卫仑
关键词 钢渣粗骨料压蒸膨胀应力    
Abstract:This study analyzes the destructive effect of steel slag coarse aggregate on concrete with bad steel slag. The destructive effect of steel slag coarse aggregate on different strength concrete samples was investigated by autoclave tests of the steel slag coarse aggregate and the concrete containing the steel slag coarse aggregate. The free CaO and MgO mass ratios of the steel slag were 4.83% and 4.76%. The results show that the free CaO and the minerals containing MgO react rapidly at high temperatures, which crushes the steel slag aggregate due to the interior expansion stresses. The concrete containing the steel slag coarse aggregate might be damaged by the expansion stresses caused by the steel slag. The concrete damage is more severe with higher steel slag coarse aggregate mass ratios. Though the higher strength concrete can resist higher interior expansion stresses caused by the steel aggregate, the aggregate content should still be strictly controlled. For the steel slag used in this paper, the steel slag coarse aggregate mass ratios should be less than 40%.
Key wordssteel slag    coarse aggregate    autoclave test    expansion stresses
收稿日期: 2014-09-12      出版日期: 2015-11-09
ZTFLH:  TU528  
通讯作者: 王强, 副教授。 E-mail: w-qiang@mail.tsinghua.edu.cn     E-mail: w-qiang@mail.tsinghua.edu.cn
引用本文:   
米贵东, 王强, 王卫仑. 蒸养条件下钢渣粗骨料对混凝土的破坏作用[J]. 清华大学学报(自然科学版), 2015, 55(9): 940-944.
MI Guidong, WANG Qiang, WANG Weilun. Destructive effect of steel slag coarse aggregate on the concrete under autoclaved condition. Journal of Tsinghua University(Science and Technology), 2015, 55(9): 940-944.
链接本文:  
http://jst.tsinghuajournals.com/CN/  或          http://jst.tsinghuajournals.com/CN/Y2015/V55/I9/940
  表1 混凝土的配合比
  图1 钢渣粗骨料压蒸后的状态
  表2 钢渣的化学组成
  图2 压蒸后的钢渣的XRD 图谱
  表3 混凝土的90d抗压强度
  图3 混凝土压蒸后的状态
  表4 混凝土压蒸后的状态
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