煅烧硅灰石粉对硫氧镁水泥力学性能的影响  

Effect of calcined wollastonite powder on mechanical properties of magnesium sulfade cement

作　　者：李知俊 胡智淇 关岩 毕万利 LI Zhijun;HU Zhiqi;GUAN Yan;BI Wanli(School of Civil Engineering,Liaoning University of Science and Technology,Anshan 114051,China;Department of Construction Engineering,Dalian University of Technology,Dalian 116081,China;School of Materials and Metallurgy,Liaoning University of Science and Technology,Anshan 114051,China)

机构地区：[1]辽宁科技大学土木工程学院,鞍山114051 [2]大连理工大学建设工程学部,大连116081 [3]辽宁科技大学材料与冶金学院,鞍山114051

出　　处：《复合材料学报》2024年第1期395-403,共9页Acta Materiae Compositae Sinica

基　　金：国家重点研发计划(2020YFC1909304)。

摘　　要：为增强硫氧镁水泥(MOS)的力学性能,本文以煅烧前后硅灰石粉末(WS)作为外掺料,研究了其对MOS力学性能的影响,并利用DSC-TG、XRD、FTIR、NMR、SEM、压汞法(MIP)对煅烧前后(1000℃)的硅灰石粉和WS/MOS混合体系进行分析。试验表明,煅烧可以激发硅灰石粉中^(29)Si的水化活性,并且煅烧后的硅灰石粉在镁碱环境中可以激发其水化活性导致WS/MOS复合材料的性能更优。硅灰石能增强MOS的力学性能,同时煅烧后的硅灰石粉对WS/MOS复合体系强度的增幅更明显,当煅烧后WS掺量为20wt%时,MOS 28天的抗折强度和抗压强度达到最大值,分别为11.4 MPa和63.4 MPa,增量可达71.4%和21.2%。WS优化了MOS孔隙结构,降低了MOS大于100 nm的孔的比例,煅烧后的WS与MOS具有良好的界面相容性,更有利于MOS的力学性能的提升。To enhance the mechanical properties of magnesium oxysulfade(MOS)cement,wollastonite powder(WS)was utilized as an additive before and after calcination to study its effect on the mechanical properties of MOS.The WS and WS/MOS composite system before and after calcination(1000℃)were analyzed by DSC-TG,XRD,FTIR,NMR,SEM,and mercury intrusion porosimetry(MIP).The results show that calcination stimulates the hydration activity of ^(29)Si in WS,and the calcined WS stimulates its hydration activity in magnesium alkali environment,resulting in better performance of WS/MOS composite materials.WS enhances the mechanical properties of MOS,and the strength of WS/MOS composite system with the calcined WS increases more significantly.The bending strength and compressive strength of MOS on the 28 days reach their maximum values when the after calcination WS content is 20wt%,which are 11.4 MPa and 63.4 MPa,respectively,with increments of 71.4%and 21.2%.WS optimizes the pore structure and reduces the proportion of pores larger than 100 nm in MOS.The calcined WS has good interface compatibility with MOS,which is more conducive to improving the mechanical properties of MOS.

关 键 词：硅灰石 煅烧 MOS 力学性能 微观结构 

分 类 号：TU525.9[建筑科学—建筑技术科学] TB332[一般工业技术—材料科学与工程]