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To reveal damage evolution and brittle-ductile synergistic behavior of the gypsum-slag-cement (GSC) ternary cementitious system under uniaxial compression, this study conducted uniaxial compression tests at different curing ages by adjusting the ratios of gypsum, cement, and slag. Combined with digital image correlation (DIC) and scanning electron microscopy (SEM) techniques, a systematic analysis was performed from three perspectives: macroscopic mechanical response, crack propagation characteristics, and microstructural evolution. Results indicated that with extension of curing age, compressive strength, elastic modulus, as well as crack initiation and damage stresses of GSC system significantly increased, while post-peak failure gradually transitioned from typical brittleness to quasi-ductility. Increasing the proportion of cement content helped enhance the material's strength, stiffness, and overall bonding capacity, but led to increased brittleness. Gypsum content exhibited a significant nonlinear influence on material properties. A proportion of 10% effectively promoted internal stress redistribution and synergistic multi-crack propagation, thereby improving toughness and cracking resistance, whereas excessive gypsum tended to cause a decline in structural continuity and deterioration of mechanical performance. Comprehensive comparison revealed that the formula G10S70C20 demonstrated the highest compressive strength and superior deformation coordination ability at curing age of 28 d, with cracks exhibiting a typical symmetrical "X" pattern, indicating optimal comprehensive performance. The findings suggested that synergistic regulation of gypsum and cement was the key to achieving both strength enhancement and an optimized brittle-ductile balance in the GSC system.

, authors=Ning Guo, authorsList=Ning Guo, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1304141608329437523, articleId=1304141607717069137, tenantId=1146029695717560320, journalId=1303687303576780880, language=CN, title=石膏-矿渣-水泥三元胶凝体系单轴压缩损伤演化与脆韧性协同机制, columnId=1304878720477590059, journalTitle=铜业工程, columnName=矿冶固废资源综合利用与污染防治专题, runingTitle=null, highlight=null, articleAbstract=

为揭示石膏-矿渣-水泥（GSC）三元胶凝体系在单轴压缩作用下的损伤演化规律及脆韧性协同机制，通过调节石膏、水泥与矿渣配比，开展不同养护龄期的单轴压缩试验，并结合数字图像相关法（DIC）与扫描电镜（SEM）技术，从宏观力学响应、裂纹扩展特征和微观结构演化三个层面进行了系统分析。结果表明：随着养护龄期延长，GSC体系的抗压强度、弹性模量及裂纹起始应力、损伤应力均明显提高，峰后破坏特征由早期典型脆性逐步向准延性转变；提高水泥掺量有助于增强材料强度、刚度和整体胶结能力，但会导致脆性增强；石膏掺量对材料性能有显著的非线性影响：石膏掺量为10%时，可有效促进内部应力重分布与多裂纹协同扩展，提升韧性与抗裂能力；过量石膏则易造成结构连续性下降和力学性能劣化。综合比较可知，配比G10S70C20在28 d龄期下表现出最高抗压强度与较优变形协调能力，裂纹呈较典型的对称“X”形扩展，性能最佳。上述研究结果表明，石膏与水泥的协同调控是实现GSC体系强度提升与脆韧性平衡优化的关键。

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郭宁（1990—），男，甘肃武山人，本科，工程师，研究方向：绿色低碳胶凝材料与工程应用，E-mail：1134732722@qq.com

"}, bioImg=null, bioContent=

郭宁（1990—），男，甘肃武山人，本科，工程师，研究方向：绿色低碳胶凝材料与工程应用，E-mail：1134732722@qq.com

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