矿渣-硅灰在碱激发作用下固化赤泥的基本工程性能研究  

Study on the Basic Engineering Properties of Slag-Silica Ash Solidifying Red Mud under Alkali Excitation

作　　者：贺高乐 崔雯雯 杨振 赵睿阳 董晓强[1,2] HE Gaole;CUI Wenwen;YANG Zhen;ZHAO Ruiyang;DONG Xiaoqiang(College of Civil Engineering,Taiyuan University of Technology,Taiyuan Shanxi,China;Shanxi Provincial Key Laboratory of Civil Engineering Disaster Prevention and Control,Taiyuan Shanxi,China)

机构地区：[1]太原理工大学土木工程学院,山西太原 [2]山西省土木工程防灾与控制重点实验室,山西太原

出　　处：《太原理工大学学报》2025年第2期207-215,共9页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金(52378360和5197843);国家自然科学基金委员会国际合作与交流项目(52281340410);山西省研究生研究与创新项目(2023KY173)。

摘　　要：【目的】针对协同利用工业固废固化赤泥的需求,通过在赤泥中添加矿渣、硅灰等工业固废材料,并利用NaOH激发反应体系来共同固化赤泥。【方法】利用无侧限抗压强度试验机、数字交流电桥、X射线衍射仪、扫描电子显微镜、同步热分析仪对固化赤泥的强度、电阻率、水化产物、微观结构进行测试。探讨不同固化剂的配比、碱激发剂的用量、养护龄期等对固化赤泥基本性能的影响。【结果】结果表明:矿渣和硅灰无论是单掺还是复掺都可以提高固化赤泥的强度,碱激发剂主要作用是激发赤泥的潜在胶凝活性。通过对试验配比进行优化,赤泥中复掺矿渣和硅灰效果最好,以无侧限抗压强度作为评价指标,当矿渣、氢氧化钠、硅灰的掺量分别为15%、3%、3%的时候,固化赤泥的28 d无侧限抗压强度最高达到13.12 MPa。【Purposes】In order to meet the demand for co-utilization of industrial solid waste to solidify red mud,it is proposed to add industrial solid waste materials such as slag and silica ash to red mud,and use NaOH initiation reaction system to co-solidify red mud.【Methods】The strength,resistivity,hydration products,and microstructure of solidified red mud were tested by using unconfined compressive strength testing machine,digital AC bridge,X-ray diffractometer,scanning electron microscope,and synchronous thermal analyzer.The effects of curing agent ratio,alkali initiators dosage,and curing age on the basic properties of cured red mud were discussed.【Findings】The results show that the strength of solidified red mud can be improved by both single doping and compound doping of slag and silica ash,and the main function of alkali initiator is to stimulate the potential gelling activity of red mud.By optimizing the test ratio,the effect of compound doping slag and silica ash in red mud is the best.The unconfined compressive strength is used as the evaluation index.When the contents of slag,sodium hydroxide,and silica ash are 15%,3%,and 3%,respectively,the 28 d unconfined compressive strength of solidified red mud reaches up to 13.12 MPa.

关 键 词：赤泥 硅灰 综合利用 胶凝活性 水化机理 

分 类 号：TU432[建筑科学—岩土工程]