用粉煤灰和铁尾矿制备高强混凝土  

Preparation of High-strength Concrete by Using Fly Ash and Iron Ore Tailings as Major Raw Materials

作　　者：刘佳[1] 倪文[1] 于淼[1] 

机构地区：[1]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

出　　处：《材料研究学报》2012年第3期295-301,共7页Chinese Journal of Materials Research

基　　金：国家高技术研究发展计划2012AA062405资助项目~~

摘　　要：以粉煤灰和铁尾矿为主要原料制备高强混凝土,用X射线衍射(XRD)和扫描电镜(SEM)分析材料的水化产物和微观形貌,研究了铁尾矿掺量、水胶比、高效减水剂用量对高强混凝土力学性能的影响。结果表明,混凝土的抗压强度为100.1 MPa,抗折强度为20.6 MPa,固体废弃物掺量达86.4%;在水化过程中大量C-S-H凝胶和钙矾石的生成为细骨料混凝土提供了早期强度,火山灰活性反应对Ca(OH)_2的消耗是混凝土后期强度持续提高的主要原因。A high-strength concrete material was prepared by using fly ash and iron ore tailings as major raw materials. Reaction products and microstructure of hydrated harden samples of the high- strength concrete material were analyzed by XRD and SEM methods, and the influences of several factors, such as proportion of iron ore tailing, water-binder ratio and dosage of super plasticizer, on the mechanical properties of the high-strength concrete material were investigated. The results show that the prepared concrete material is composed of large ratio of solid waste up to 86.4% （mass fraction）, and its compressive strength reached to 100.1 MPa with a flexural strength of 20.6 MPa. The early strength of the samples was developed by the formation of large amount of C-S-H gel and ettringite during the early hydration stage. The continued development of strength in of the waste materials which leaded consumption the last stage was mainly caused by pozzolanic reactions reduction and disappearance of Ca（OH）2 in the system.

关 键 词：无机非金属材料 高强混凝土 高效减水剂 水胶比 

分 类 号：TB321[一般工业技术—材料科学与工程]