预处理建筑垃圾与沸腾炉灰渣制备高性能混凝土与硬化机理研究  

Preparation of high-performance concrete from pre-treated construction waste and boiling furnace ash and study of its hardening mechanism

作　　者：范裕如 蒋凯伟 FAN Yuru;JIANG Kaiwei(College of Energy Engineering,Shanxi Institute of Science and Technology;College of Energy and Power Engineering,North University of China)

机构地区：[1]山西科技学院能源工程学院 [2]中北大学能源动力工程学院

出　　处：《环境工程技术学报》2025年第2期671-682,共12页Journal of Environmental Engineering Technology

基　　金：山西省科技厅山西省基础研究计划项目(202303021212303)。

摘　　要：为充分资源化利用沸腾炉灰渣和建筑垃圾等固体废物,研发得到一种预处理建筑垃圾-沸腾炉灰渣基高性能混凝土。分析了混凝土的力学性能、抗氯离子渗透性能、抗冻融循环性能和硬化机理。结果表明:当沸腾炉灰渣对粉煤灰替代量为50%,细粒级与粗粒级建筑垃圾的比例为460.00 kg/m^(3):562.22 kg/m^(3)(HF3)时,混凝土抗压强度和弹性模量最大,混凝土试件HF3在第28天的抗压强度和弹性模量分别为37.51和3.51×10^(4)MPa。混凝土抗氯离子渗透性能随沸腾炉灰渣含量增加而增强,第28天的HF3具有极低的氯离子渗透等级(电通量为113 C)。HF3相对质量、相对抗压强度和相对弹性模量随冻融循环次数的增加显示出损失程度降低特征。对于冻融损伤程度(D)相关拟合方程y=a×bx,HF3的b参数最小,为1.00876,表明HF3抗冻融循环能力最强。硬化机理表明:沸腾炉灰渣掺入可为混凝土体系提供较多的活性[SiO_(4)]^(4-)和[AlO_(4)]^(5-)物质,提高了钙矾石中六配位Al(AlO_(6))含量(90.35%)、C—(A)—S—H中O 1s桥氧键含量(99.90%)及Si2p结合能(102.05 eV)。另外,HF3的微观结构具有较少的裂痕,可见较多的钙矾石和C—(A)—S—H胶结在一起,组成致密的固化体结构。To fully utilize solid waste such as boiling furnace ash and construction waste,a high-performance concrete based on pre-treated construction waste and boiling furnace ash was developed.The mechanical properties,resistance to chloride ion penetration,resistance to freeze-thaw cycles,and hardening mechanisms of the concrete were analyzed.The research results indicated that when the substitution rate of boiling furnace residue for fly ash was 50%,and the unit cubic mass ratio of fine-grained to coarse-grained construction waste was 460.00 kg/m^(3):562.22 kg/m^(3).The concrete exhibited maximum compressive strength and elastic modulus.Specifically,the compressive strength and elastic modulus of HF3 on the 28th day were 37.51 and 3.51×10^(4)MPa,respectively.The resistance to chloride ion penetration of the concrete increased with the content of boiling furnace residue,and HF3 on the 28th day had an"extremely low"chloride ion penetration grade(electric flux was 113 C).The relative mass,relative compressive strength,and relative elastic modulus of HF3 showed the least loss with an increase in freezethaw cycles.The related fitting equation for freeze-thaw damage degree D,y=a×bx,showed that b parameter for HF3 was the smallest at 1.00876,indicating its strongest resistance to freeze-thaw cycles.The hardening mechanism revealed that the addition of boiling furnace residue provided more active[SiO_(4)]^(4-)and[AlO_(4)]^(5-)substances in the concrete system,increasing the content of six-coordinated Al(AlO_(6))in ettringite(90.35%)and the content of O 1s bridging oxygen bonds(99.90%)and Si 2p binding energy(102.05 eV)in C—(A)—S—H.Furthermore,the microstructure of HF3 exhibited fewer cracks,revealing a denser solidified structure with a significant presence of calcium aluminate and C-(A)-S-H binding together.

关 键 词：燃煤灰渣 混凝土 抗氯离子渗透性能 抗冻融循环性能 硬化机理 

分 类 号：X705[环境科学与工程—环境工程]