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重金属污泥烧结骨料对超高强混凝土力学性能的影响

Effects of Heavy-Metal-Sludge Sintered Aggregates on the Mechanical Properties of Ultra-High-Strength Concrete.

作者信息

Zhong Weijun, Wang Sheng, Chen Yue, Ye Nan, Shu Kai, Dai Rongnan, Ba Mingfang

机构信息

Ningbo Power Design Institute Co., Ltd., Ningbo 315020, China.

School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China.

出版信息

Materials (Basel). 2025 Jul 21;18(14):3422. doi: 10.3390/ma18143422.

DOI:10.3390/ma18143422
PMID:40731632
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12299822/
Abstract

To investigate the effects of heavy-metal-sludge sintered aggregates on the workability, mechanical properties, and fracture toughness of ultra-high-strength concrete (UHSC), this study systematically evaluated the influence of different aggregate replacement ratios and particle gradations on the fluidity, flexural strength, compressive strength, and fracture energy of UHSC. Microstructural characterization techniques including SEM, XRD, TG, and FTIR were employed to analyze the hydration mechanism and interfacial transition zone evolution. The results demonstrated the following: Fluidity continuously improved with the increase in the sintered aggregate replacement ratio, with coarse aggregates exhibiting the most significant enhancement due to the "ball-bearing effect" and paste enrichment. The mechanical properties followed a trend of an initial increase followed by a decrease, peaking at 15-20% replacement ratio, at which flexural strength, compressive strength, and fracture energy were optimally enhanced; excessive replacement led to strength reduction owing to skeletal structure weakening, with coarse aggregates providing superior improvement. Microstructural analysis revealed that the sintered aggregates accelerated hydration reactions, promoting the formation of C-S-H gel and Ca(OH), thereby densifying the ITZ. This study identified 15-20% of coarse sintered aggregates as the optimal replacement ratio, which synergistically improved the workability, mechanical properties, and fracture toughness of UHSC.

摘要

为研究重金属污泥烧结骨料对超高强混凝土（UHSC）工作性、力学性能和断裂韧性的影响，本研究系统评估了不同骨料替代率和颗粒级配对UHSC流动性、抗折强度、抗压强度和断裂能的影响。采用扫描电子显微镜（SEM）、X射线衍射仪（XRD）、热重分析仪（TG）和傅里叶变换红外光谱仪（FTIR）等微观结构表征技术分析水化机理和界面过渡区演变。结果表明：随着烧结骨料替代率的增加，流动性持续改善，由于“滚珠效应”和浆体富集，粗骨料表现出最显著的增强效果。力学性能呈先增加后降低的趋势，在替代率为15%-20%时达到峰值，此时抗折强度、抗压强度和断裂能得到最佳增强；过量替代由于骨架结构削弱导致强度降低，粗骨料的改善效果更佳。微观结构分析表明，烧结骨料加速了水化反应，促进了C-S-H凝胶和Ca(OH)₂的形成，从而使界面过渡区致密化。本研究确定15%-20%的粗烧结骨料为最佳替代率，其协同改善了UHSC的工作性、力学性能和断裂韧性。

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