基于铁尾矿粉的多掺复合胶凝材料水化特性与机理探究  

Investigation on the hydration characteristics and mechanism of multi-blended cementitious materials based on iron tailings powder

作　　者：黄凯勇 郭荣鑫[1,2,3] 颜峰 HUANG Kaiyong;GUO Rongxin;YAN Feng(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Key Laboratory of Disaster Reduction in Civil Engineering,Kunming 650500,China;International Joint Laboratory for Green Construction and Intelligent Maintenance of Yunnan Province,Kunming 650500,China)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650500 [2]云南省土木工程防灾重点实验室,云南昆明650500 [3]云南省绿色建造与智慧运维国际联合实验室,云南昆明650500

出　　处：《新型建筑材料》2025年第2期138-143,共6页New Building Materials

摘　　要：以铁尾矿粉、硅粉、矿渣替代部分水泥制备复合胶凝材料,研究三掺体系在不同配比下的强度发展,并对复合胶凝材料的水化机理进行分析。结果表明,铁尾矿粉作为活性掺合料掺入胶凝体系,在其中主要发挥其晶核效应、火山灰活性与微集料效应,由于其活性低且水化反应诱导期较长,至养护到后期时才能充分发生水化反应;硅粉的掺入能够为体系提供大量高活性硅,提高试样的水化反应速度,降低氢氧化钙的含量,生成更多的C-S-H凝胶,并且未水化的硅粉颗粒填充在孔隙之中提高了试样的致密性,但掺量过多会出现负面效果;在复合胶凝材料中掺入5%硅粉、25%矿渣、20%铁尾矿粉时固结体的28 d抗压强度能够达到42.6 MPa。Composite cementitious materials was prepared by replacing some cement with iron tailings powder,silicon powder,and slag.This paper aims to study the strength development of the three admixture systems under different ratios,and analyze the hydration mechanism of the composite cementitious materials.The results showed that iron tailings powder,as an active admixture added to the cementitious system,mainly exhibited its nucleation effect,volcanic ash activity,and micro aggregate effect.Due to its low activity and long hydration reaction induction period,hydration reaction could only fully occur in the later stage of curing.The addition of silicon powder can provide a large amount of highly active silicon for the system,improve the hydration reaction speed of the sample,reduce the content of calcium hydroxide,generate more C-S-H gel,and fill the pores with unheated silicon powder particles to improve the compactness of the sample,but excessive addition will have negative effects.When the composite system includes 5%silica powder,20%iron tailings powder,and 25%slag,the compressive strength of the consolidated material reaches 42.6 MPa at 28 days.

关 键 词：铁尾矿 矿渣 硅粉 力学性能 水化机理 

分 类 号：TU526[建筑科学—建筑技术科学]