Meso-damage mechanism of sintered sludge cementitious composites under uniaxial compression: Experimental characterization and theoretical modeling

被引：0
作者：
Zhang, Jinrui [1 ]
Wu, Zhuofan [1 ]
Yang, Youzhi [1 ]
Kang, Ziye [1 ]
Hou, Dongshuai [2 ]
Dong, Biqin [3 ]
机构：
[1] Tianjin Univ, State Key Lab Hydraul Engn Intelligent Construct &, Tianjin 300072, Peoples R China
[2] Qingdao Univ Technol, Dept Civil Engn, Qingdao 266000, Peoples R China
[3] Shenzhen Univ, Guangdong Prov Key Lab Durabil Marine Civil Engn, Shenzhen 518060, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2025年 / 469卷
基金：
中国国家自然科学基金;
关键词：
Sintered sludge cementitious composites; Meso-damage mechanism; Uniaxial compression; Classical damage theory; Theoretical modeling; SEWAGE-SLUDGE; FLY-ASH; EVOLUTION; BEHAVIOR; EMISSION; TAILINGS; CARBON;
D O I：
10.1016/j.conbuildmat.2025.140490
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Considering the performance and environmental potential of sintered sludge cementitious composite (SSCC), this research comprehensively evaluated the meso-damage mechanism of SSCC under uniaxial compression through experimental characterization and theoretical modeling. Specifically, advanced techniques such as acoustic emission (AE), digital image correlation (DIC), low-field nuclear magnetic resonance (LFNMR), and scanning electron microscopy (SEM) were employed to deeply characterize the damage responses, meso-structures and damage morphology. Theoretical modeling based on the classical damage theory (CDT) framework established a stochastic damage constitutive (SDC) model to elucidate the intrinsic relationship between meso-damage mechanism and macro-performance. Results demonstrated that the stress-strain behavior, energy response, and macro-cracks evolution of SSCC, showing distinctly different behaviors before and after the peak point on the constitutive curves, were accurately predicted by SDC model. LFNMR and SEM confirmed that macro-damage originated from interfacial transition zone (ITZ) fracture. Furthermore, SDC model verified that 5 % SSA effectively enhanced the elasticity and ductility of meso-structure, thereby significantly improving the macroperformance and damage resistance.
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页数：15
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