蒸养条件下钢渣粗骨料对混凝土的破坏作用

删除或更新信息，请邮件至freekaoyan#163.com(#换成@)

清华大学辅仁网/2017-07-07

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

摘要:

输出: BibTeX | EndNote (RIS)

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%。

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 words：steel 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.cnE-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

图表:

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

参考文献:

[1] LI Jianxin, YU Qijun, WEI Jiangxiong, et al. Structural characteristics and hydration kinetics of modified steel slag [J]. Cement and Concrete Research, 2011, 41(3): 324-329.
[2] YI Huang, XU Guoping, CHENG Huigao. An overview of utilization of steel slag [J]. Procedia Environmental Sciences, 2012, 16(10): 791-801.
[3] SHI Caijun. Steel slag-Its production, processing, characteristics, and cementitious properties [J]. Journal of Materials in Civil Engineering, 2004, 16 (3): 230-236.
[4] WANG Qiang, YAN Peiyu, FENG Jianwen. A discussion on improving hydration activity of steel slag by altering its mineral compositions [J]. Journal of Hazardous Materials, 2011, 186 (2): 1070-1075.
[5] Luckman M, Satish V, Venkateswaran D. Cementitious and pozzolanic behavior of electric arc furnace steel slag [J]. Cement and Concrete Research, 2009, 39 (2): 102-109.
[6] Maslehuddin M, Alfarabi M, Shameem M, et al. Comparison of properties of steel slag and crushed limestone aggregate concretes [J]. Construction and Building Materials, 2003, 17 (2): 105-112.
[7] Inanka N, Dubravka B, Goran V. Utilisation of steel slag as an aggregate in concrete [J]. Materials and Structures, 2011, 44 (9): 1565-1575.
[8] 尚建丽, 刑琳琳. 钢渣粗骨料混凝土界面过渡区的研究 [J]. 建筑材料学报, 2013, 16(2): 217-220.SHANG Jianli, XING Linlin. Study on interfacial transition zone of steel slag coarse aggregate concrete [J]. Journal of Building Materials, 2013, 16(2): 217-220.
[9] Qian G R, Sun D D, Tay J H, et al. Hydrothermal reaction and autoclave stability of Mg bearing RO phase in steel slag [J]. British Ceramic Transactions, 2002, 101(4): 159-164.
[10] 肖琪仲. 钢渣的膨胀破坏与抑制 [J]. 硅酸盐学报, 1996, 24(6): 635-640.XIAO Qizhong. Expansion and its inhibition of steel slag [J]. Journal of the Chinese Ceramic Society, 1996, 24(6): 635-640.
[11] ZHANG Tongsheng, YU Qijun, WEI Jiangxiong, et al. Preparation of high performance blended cements and reclamation of iron concentrate from basic oxygen furnace steel slag [J]. Resources, Conservation and Recycling, 2011, 56(1): 48-55.
[12] LIU Chunlin, ZHA Kunpeng, CHEN Depeng. Possibility of concrete prepared with steel slag as fine and coarse aggregates: A preliminary study [J]. Procedia Engineering, 2011, 24 (12): 412-416.
[13] Qian G R, Darren D S, Tay J H, et al. Autoclave properties of kirschsteinite-based steel slag [J]. Cement and Concrete Research, 2002, 32(9): 1377-1382.

No related articles found!