Effect of Carbonation Curing on Mechanical Strength and Microstructure of Mortars Prepared with Steel Slag-Cement-MgO-CaO Blends

被引：0
|
作者：
Zhang F. [1 ,2 ]
Mo L. [2 ]
Deng M. [2 ]
Cai Y. [1 ]
机构：
[1] Nanjing Hydraulic Research Institute, Nanjing
[2] College of Materials Science and Engineering, Nanjing Tech University, Nanjing
来源：
| 1600年 / Tongji University卷 / 20期
关键词：
Carbonation; Compressive strength; Magnesium oxide; Microstructure; Steel slag;
D O I：
10.3969/j.issn.1007-9629.2017.06.005
中图分类号：
学科分类号：
摘要：
Steel slag powders were used as the main component of cementitious materials, and MgO, CaO and Portland cement were incorporated to prepare mortar specimens. The mortars were then exposed to CO2 curing to test the compressive strength and microstructure and investigate the mechanism of improving strength of carbonation curing. The results show that the compressive strengths of mortars increase significantly after the carbonation curing, by 3.9-6.8 times after only 1d of carbonation. Prolonging the carbonation curing time facilitate the carbonation reaction, and hence increases the degree of carbonation and enhances the strength gain of mortars. The incorporation of CaO and MgO components increases the compressive strengths of mortars, and the highest compressive strength can reach 71. 6MPa after 14d of carbonation, when 5%(by mass) CaO and 15%(by mass) MgO are incorporated. The treatment of CO2 curing decreases the total pore volume of mortar specimens due to the microstructure densification as a result of the formation of calcite CaCO3(calcium magnesium CaxMg1-xCO3) and aragonite CaCO3. © 2017, Editorial Department of Journal of Building Materials. All right reserved.
引用
收藏
页码：854 / 861
页数：7
相关论文
共 26 条
  • [1] Wang Y., Liang H., Chen Y., Discussion on the industrialization development route of comprehensive utilization of solid wasters of iron and steel industry, Environmental Engineering, pp. 777-780, (2014)
  • [2] Zhao H., Influence of steel slag fineness and mixture amount on composite cement containing steel slag powders, China Powder Science and Technology, 18, 3, pp. 69-72, (2012)
  • [3] Kourounis S., Tsivilis S., Tsakiridis P.E., Et al., Propertiesand hydration of blended cements with steelmaking slag, Cement and Concrete Research, 37, 6, pp. 815-822, (2007)
  • [4] Qasrawi H., Shalabi F., Asi I., Use of low CaO unprocessed steel slag in concrete as fine aggregates, Construction and Building Materials, 23, 2, pp. 1118-1125, (2009)
  • [5] Pellegrino C., Gaddo V., Mechanical and durability characteristics of concrete containing EAF slag as aggregates, Cement and Concrete Composites, 31, 9, pp. 663-671, (2009)
  • [6] Ameri M., Behnood A., Laboratory studies to investigate the properties of CIR mixes containing steel slag as a substitute for virgin aggregates, Construction and Building Materials, 26, 1, pp. 475-480, (2012)
  • [7] Wang G., Wang Y., Gao Z., Use of steel slag as a granular material: Volume expansion prediction and usability criteria, Journal of Hazardous Materials, 184, 1, pp. 555-560, (2010)
  • [8] Guo Y., Pan H., Li Z., Study on carbonation of steel-fiber reinforced concrete, Concrete, 2, pp. 45-47, (2007)
  • [9] Stolaroffj K., Lowryg V., Keithd W., Using CaO and MgO rich industrial waste streams for carbon sequestration, Energy Conversion and Management, 46, 5, pp. 687-699, (2005)
  • [10] Eloneva S., Teir S., Fogleholm C.J., Et al., Carbonation of slags from ironand steel industry, Proceedings of the 4th Nordic Minisymposium on Carbon Dioxide Capture and Storage, pp. 1-14, (2005)
123