材料研究学报  2013, Vol. 27 Issue (6): 615-621

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全尾砂废石骨料混凝土的制备和性能*

刘 佳 倪 文 于 淼

(北京科技大学 金属矿山高效开采与安全教育部重点实验室 北京 100083)

Preparation and Properties of the Concrete Made by Barren Rocks and Iron Tailings as Aggregates

LIU Jia NI Wen** YU Miao

(State Key Laboratory of High-Efficient Mining and Safety of Metal Mines (Ministry of Education of China), University of Science and Technology Beijing, Beijing 100083)

刘佳,倪文,于淼. 全尾砂废石骨料混凝土的制备和性能*[J]. 材料研究学报, 2013, 27(6): 615-621.
. Preparation and Properties of the Concrete Made by Barren Rocks and Iron Tailings as Aggregates[J]. Chinese Journal of Materials Research, 2013, 27(6): 615-621.

摘要 相关文章 Metrics 全文: PDF(3677 KB)   摘要: 以粉煤灰、铁尾矿和废石为主要原料制备出全尾砂废石骨料混凝土, 其固体废弃物掺量达到90%。用X射线衍射(XRD)、热重-差热分析(TG-DSC)和扫描电镜(SEM)等方法分析了胶凝材料的水化硬化机理和微观结构特征, 研究了粉煤灰对胶凝材料的凝结性能、力学性能和水化放热规律的影响。结果表明, 在标准养护条件下全尾砂废石骨料混凝土的28 d抗压强度达83.27 MPa的; 粉煤灰不仅具有明显的减水作用, 还可减缓水化进程, 能有效提高胶凝材料的力学性能; 在水化过程中, 粉煤灰消耗早期水化产物中的Ca(OH)2, 促进二次水化反应的进行, 从而使混凝土的长期强度稳定增长。 Abstract： A kind of high volume fly ash concrete was prepared by using fly ash, barren rocks and iron tailings as the main materials. This high-strength concrete which was made by using barren rocks and iron tailings as aggregates contained ninety percent industrial solid wastes, its compressive strength under standard curving conditions was up to 83.27 MPa at the 28 days curving ages. Effects of fly ash on the working performance, mechanical performance and hydration process of the cementitious materials were investigated. The hydration properties and microstructure characteristics were analyzed by the XRD, TG-DSC and SEM. The results show that the fly ash can reduce the water consumption, slow down the hydration process and improve the mechanical properties of the cementitious materials. And the fly ash can consume the calcium hydroxide which was produced during the early hydration process, motivate the secondary hydration process, so as to ensure steady increase of the long-term strength.      ZTFLH:  分类号 TB321   基金资助:国家高技术研究发展计划2012AA062405资助项目。 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 44.8K 链接本文: https://www.cjmr.org/CN/      或      https://www.cjmr.org/CN/Y2013/V27/I6/615 [1] 路来福,高芒来,杨森锋,谷 峥,刘月宁. 两性表面活性剂改性膨润土的制备及其对环丙沙星的吸附性能[J]. 材料研究学报, 2013, 27(6): 576-582. [2] 崔占奎, 米立伟, 法文君, 郑 直, 曾大文. Pt/BiOCl纳米结构的制备及其光催化性能*[J]. 材料研究学报, 2013, 27(6): 583-588. [3] 候姣姣,梅甫定. 磷石膏基材料的宏观性能与孔结构的关系*[J]. 材料研究学报, 2013, 27(6): 631-640. Viewed Full text Abstract Cited   Shared      Discussed