Study on the optimization of the mechanica properties of engineered desulfurization gypsum composites using response surface methodology  

响应面法优化脱硫石膏基复合材料力学性能研究

作　　者：TAN Yan ZHOU Lijun YU Jiangtao XIAO Henglin LONG Xiong 谭燕;周丽君;余江滔;肖衡林;龙雄(湖北工业大学土木建筑与环境学院,武汉430068;湖北工业大学河湖健康智慧感知与生态修复教育部重点实验室,武汉430068;同济大学土木工程学院,上海200092)

机构地区：[1]School of Civil Engineering Architecture and the Environment,Hubei University of Technology,Wuhan 430068,China [2]Key Laboratory of Intelligent Health Perception and Ecological Restoration of Rivers and Lakes of Ministry of Education,Hubei University of Technology,Wuhan 430068,China [3]College of Civil Engineering,Tongji University,Shanghai 200092,China

出　　处：《Journal of Southeast University(English Edition)》2025年第1期58-66,共9页东南大学学报(英文版)

基　　金：The National Natural Science Foundation of China(No.51978504).

摘　　要：Practical applications of desulfurization gypsum are limited owing to its brittleness and low strength.To overcome these challenges,researchers have developed engineered desulfurization gypsum composites(EDGCs)by incorporating ultrahigh molecular weight polyethylene(UHMWPE)fiber and sulfoaluminate cement(SAC).The mix ratio was optimized using response surface methodology(RSM).Experimental testing of EDGC under compressive and tensile loads led to the creation of a regression model that investigates the influence of variables and their interactions on the material’s compressive and tensile strengths.Additionally,microscopic morphology and hydration product composition were analyzed to explore the influence mechanism.The results indicated that EDGC’s compressive strength increased by up to 38.4%owing to a decreased water-binder ratio and higher SAC content.Similarly,tensile strength increased by up to 38.6%owing to increased SAC and fiber content.Moreover,EDGC demonstrated excellent strain-hardening behavior and multiple cracking characteristics,achieving a maximum tensile strain of nearly 3%.The research findings provide valuable insights for optimizing the performance of desulfurization gypsum.脱硫石膏的力学性能较差且脆性大,限制了其在实际工程中的应用。为改善这一缺陷,在脱硫石膏中加入超高分子量聚乙烯(UHMWPE)纤维和硫铝酸盐水泥(SAC)制备脱硫石膏基复合材料(EDGC),并利用响应面法(RSM)寻求其最优配合比。基于EDGC在压缩和拉伸荷载下的试验结果,建立回归模型,探究变量及其相互作用对EDGC抗压和抗拉强度的影响。此外,通过微观样貌和水化产物的分析揭示其影响机理。结果表明,水膏比的降低、SAC掺量的增加以及两者的交互作用,促使EDGC的抗压强度提升38.4%;SAC和纤维掺量的增加以及两者的交互作用,促使EDGC的抗拉强度提升38.6%。EDGC具有优异的拉伸应变硬化性能和多缝开裂特性,最大拉伸应变接近3%。该研究可为脱硫石膏的性能优化与实际工程应用提供参考。

关 键 词：engineered desulfurization gypsum composites(EDGC) response surface methodology(RSM) INTERACTION compressive strength tensile strength STRAIN-HARDENING 

分 类 号：TB332[一般工业技术—材料科学与工程]