摘要
赤泥是提取氧化铝过程中产生的碱性废渣,因其碱含量较高,对环境危害较大,其利用率一直较低,而赤泥地聚物混凝土材料的研发是赤泥有效利用的途径之一。赤泥地聚物混凝土作为一种新型绿色建筑材料,具有早期强度高、耐久性好、可综合利用工业废渣等优点,得到了广大研究者的青睐。然而,与矿渣和粉煤灰相比,赤泥的活性较低,较高赤泥掺量会降低混凝土强度,因此赤泥在地聚物混凝土中的用量较少。赤泥地聚物混凝土的强度形成机理和矿物组成与普通混凝土有较大区别,且影响其基本力学性能的因素较多,不同因素对其力学性能发展的影响规律尚未得到统一,也未提出合理的配合比设计方法,这均限制了赤泥地聚物混凝土的推广应用。近年来,相关学者开展了大量赤泥地聚物混凝土基本力学性能试验和理论分析工作,探讨了基于物质的量比和质量比的配合比设计方法,探索了不同参数对赤泥地聚物混凝土基本力学性能的影响规律,分析了赤泥地聚物混凝土的强度形成机理,为赤泥地聚物混凝土的发展应用奠定了坚实的基础。本文回顾了国内外相关学者对赤泥地聚物混凝土基本力学性能的研究现状,综述了赤泥地聚物混凝土种类、配合比设计方法,同时进一步阐述了碱激发剂种类、掺量,赤泥掺量,水玻璃模数,养护方式,养护温度,赤泥来源,赤泥加工处理方法和外加剂等因素对赤泥地聚物混凝土基本力学性能的影响。最后,探讨了赤泥地聚物混凝土基本力学性能研究所面临的问题及后续需要进行的研究。
Red mud(RM)is a kind of alkaline waste produced in the process of extracting alumina.Because of its high alkali content and great harm to environment,it has low utilization rate.One effective way to use RM is the development of red mud geopolymer concrete(RMGC).As a new type of green building material,RMGC has many advantages,such as acceptable early strength,durability performance and comprehensive utilization of industrial waste residue.Therefore,the research on RMGC has attract the most attention among researchers.However,compared with slag and fly ash,RM has low pozzolanic reactivity.The high RM content often leads to low concrete strength.Therefore,the rate of RM utilization is low in RMGC.The strength formation mechanism and mineral composition of RMGC are different from those of ordinary concrete.And there are many factors affecting the basic mechanical properties of RMGC.The effects of different factors on basic mechanical properties of RMGC has not been unified.A reasonable design method of RMGC mix ratio has not been put forwarded.All these restrict the widely application of RMGC.In recent years,researchers have carried out experiments and theory study on basic mechanical properties of RMGC.The design method of mix proportion based on molar ratio and mass ratio was discussed.And the effects of different factors on the basic mechanical properties of RMGC has been obtained.The strength formation mechanism of RMGC is discussed.All these laid a solid foundation for development and application of RMGC.The research status of mechanical properties of RMGC at home and abroad are reviewed in this paper.And the types and mix design methods of RMGC are summarized.And the factors such as the type and content of alkali activator,RM content,sodium silicate modulus,curing type,curing temperature,RM source,RM processing methods,additives and other factors affecting mechanical properties of RMGC are also mentioned.Finally,the problems faced by researchers on mechanical properties of RMGC and the future research are inve
作者
王永宝
原元
赵人达
张晋杰
WANG Yongbao;YUAN Yuan;ZHAO Renda;ZHANG Jinjie(College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第15期15102-15109,共8页
Materials Reports
基金
国家自然科学基金项目(51778531)
山西省应用基础研究项目(201801D221223)
山西省高等学校科技创新项目。
关键词
赤泥
地聚物混凝土
力学性能
配合比
强度
red mud
geopolymer concrete
mechanical properties
mix proportion
strength
