摘要
石粉在混凝土材料中的再利用可为石材行业中的废弃微粉提供规模化消纳途径,诸多学者对石粉混凝土的性能开展了试验研究。本文以碳酸钙类石粉为研究对象,主要包括大理石粉(Marble powder,MP)和石灰石粉(Limestone powder,LP),分析了二者的理化性质与微观形貌特征;系统梳理了国内外学者对掺入MP、LP的水泥基材料性能的研究,分别分析了二者对混凝土水化过程、微细观结构的影响和作用机理,进而分析了不同替代方式、水灰比(w/c)等关键参数对石粉混凝土流变性能、力学性能和耐久性能的影响,并对石粉混凝土的强度预测模型、环境和经济效益、结构应用进行了总结。研究结果表明充分利用MP和LP的细度和组分特性,基于适当的配合比设计,石粉能够起到加速水泥水化、细化孔隙结构的作用,可表现出填充效应、成核效应、化学效应作用机理,从而稳定提升混凝土材料的流变、力学和耐久性能。此外,在强度预测模型方面,机器学习技术能够较好地预测石粉混凝土的强度。在环境和经济评价方面,适量石粉替代水泥或者细骨料能够提升混凝土的环境、经济效益。在结构应用方面,适宜掺量的石粉混凝土能够保证混凝土梁的承载能力。最后对国内外相关技术标准与规范现状进行了总结。
Stone powder can be recycled in concrete materials,offering a large-scale solution for utilizing waste micropowder from the stone industry.There are a lot of experimental studies on the performance of concrete incorporating stone powder.This article focuses on calcium carbonate stone powder,mainly referred to marble powder(MP)and limestone powder(LP)as addition of concrete.Firstly,the physical and chemical properties,and microscopic morphological characteristics of both are analyzed.Then,systematically reviews the researches on properties of cement materials with the addition of MP and LP,analyzes the effects and mechanisms of MP and LP on the hydration process and microstructure of concrete,and investigates the impacts of key parameters,such as various substitution methods,water-cement ratio(W/C),etc,on stone powder concrete performance,including rheological properties,mechanical properties,and durability.Furthermore,strength prediction model,environmental and economic benefits,and structural applications of stone powder concrete were summaried.The research indicates that by fully utilizing the fineness and component characteristics of MP and LP,along with appropriate mix ratio design,stone powder can accelerate cement hydration,refine the pore structure,and demonstrate filling effect,nucleation effect and chemical effect.This process stably improves the rheological,mechanical,and durability properties of concrete materials.Additionally,in terms of strength prediction model,machine learning techno-logy can accurately predict the strength of stone powder concrete.In terms of environmental and economic evaluations,replacing cement or fine aggregate with an appropriate amount of stone powder can enhance the environmental and economic benefits of concrete.In terms of structural applications,suitable amounts of stone powder concrete can ensure the load-bearing capacity of concrete beams.Finally,the status quo of relevant technical standards and specifications at home and abroad are summarized.
作者
张巧
张艺欣
陈茜
侯炜
涂兵雄
ZHANG Qiao;ZHANG Yixin;CHEN Xi;HOU Wei;TU Bingxiong(College of Civil Engineering,Huaqiao University,Xiamen 361021,Fujian,China;Key Laboratory for Structural Engineering and Disaster Prevention of Fujian Province,Xiamen 361021,Fujian,China;Nan’an-HQU Institute of Stone Industry Innovations Technology,Quanzhou 362342,Fujian,China;CCCC Third Harbor Engineering No.6 Co.,Ltd.,(Xiamen),Xiamen 361006,Fujian,China)
出处
《材料导报》
北大核心
2025年第10期123-137,共15页
Materials Reports
基金
国家自然科学基金(52208313,52178210)
福厦泉国家自主创新示范区协同创新平台项目(3502ZCQXT2022002)
华侨大学中青年教师科技创新资助计划(ZQN-1116)。
关键词
大理石粉
石灰石粉
碳酸钙
混凝土
微细观结构
宏观性能
marble powder
limestone powder
calcium carbonate
concrete
microstructures
macroscopic property
