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To solve the problem of excessive drying shrinkage in alkali-activated materials (AAM), by introducing a CaSO₄-MgO composite expansion agent (CM) to regulate the drying shrinkage behavior of alkali-activated copper slag-ground granulated blastfurnace slag mortar (CS-AAM), the influence of the mass ratio of CaSO₄ to MgO in CM on the workability, hydration process, microstructure evolution, and macroscopic mechanical properties of CS-AAM was systematically investigated, along with the synergistic shrinkage reduction mechanism of CM. The results indicate that adjusting the mass ratio of CaSO₄ to MgO in CM can effectively control the fluidity and setting time of CS-AAM paste. When the mass ratio of CaSO₄ to MgO is 2∶1, the 28-day compressive strength reaches its peak at 74.1 MPa, representing a 4.4% increase compared to the control group, while the 180-day drying shrinkage rate decreases by 40.9%. Microscopically, the total porosity is reduced, resulting in the most compact structure. As the proportion of CaSO₄ decreases, the amount of ettringite formation decreases, while the formation of brucite increases accordingly. Therefore, by adjusting the mass ratio of CaSO₄ to MgO within the range of 3∶0 to 1∶2 can achieve the optimal comprehensive performance of CS-AAM.

, authors=Haiqiang Wang¹, Gangzhu Sun², Rongsheng Xu³, authorsList=Haiqiang Wang, Gangzhu Sun, Rongsheng Xu, authorCompany=null, correspAuthors=Gangzhu Sun, 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=1321866413984305369, articleId=1321866413522931927, tenantId=1146029695717560320, journalId=1225396423026438145, language=CN, title=CaSO₄-MgO复合膨胀剂对碱激发铜渣矿渣砂浆干燥收缩及相关性能的影响机制, columnId=1226462297560892399, journalTitle=矿业研究与开发, columnName=选矿与资源综合利用, runingTitle=null, highlight=null, articleAbstract=

为解决碱激发胶凝材料（AAM）中干燥收缩过大问题，通过引入CaSO₄-MgO复合膨胀剂（CM）对碱激发铜渣-矿渣砂浆（CS-AAM）的干燥收缩行为进行调控，系统考察了CM中CaSO₄与MgO质量比对CS-AAM工作性能、水化进程、微观结构演变及宏观力学性能的影响规律，并揭示了CM的协同减缩机制。研究结果表明，调节CM中CaSO₄与MgO的质量比可有效调控CS-AAM净浆的流动度与凝结时间。当CaSO₄与MgO质量比为2∶1时，28 d抗压强度最高，为74.1 MPa，相较于对照组提升了4.4%，而180 d干燥收缩率降低了40.9%；微观上，此时总孔隙率降低，结构最为致密。随着CaSO₄比例的降低，体系内钙矾石生成量减少，而水镁石生成量则相应增加。因此调控CaSO₄与MgO质量配比为3∶0~1∶2范围内，可实现CS-AAM综合性能最优。

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王海强（1988—），男，河南郑州人，硕士，讲师，主要从事建材性能优化、工业固废资源化利用及加气混凝土方面的研究工作。E-mail: wanghaiqiang@henetc.edu.cn

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王海强（1988—），男，河南郑州人，硕士，讲师，主要从事建材性能优化、工业固废资源化利用及加气混凝土方面的研究工作。E-mail: wanghaiqiang@henetc.edu.cn

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