柠檬酸对竹屑-硫氧镁水泥物理性能的影响  

Effects of Citric Acid on the Physical Properties of Bamboo Sawdust-Magnesium Oxysulfate Cement

作　　者：张国嵩 张华刚[1,2] 方强 武绍元[3] ZHANG Guosong;ZHANG Huagang;FANG Qiang;WU Shaoyuan(Space Structures Research Center,Guizhou University,Guiyang 550025,China;Key Laboratory of Structural Engineering of Guizhou Province,Guiyang 550025,China;Sinohydro Bureau 9 Co.,Ltd.,Guiyang 550081,China)

机构地区：[1]贵州大学空间结构研究中心,贵州贵阳550025 [2]贵州省结构工程重点实验室,贵州贵阳550025 [3]中国水利水电第九工程局有限公司,贵州贵阳550081

出　　处：《贵州大学学报（自然科学版）》2024年第3期71-77,共7页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金-地区科学基金资助项目(52068008)。

摘　　要：硫氧镁(magnesium oxysulfate, MOS)水泥具有耐火性好、轻质、导热系数低和早强等优点,但其强度低,耐水性差。为了改善其性能,在MOS水泥中掺入竹屑和改性剂柠檬酸,研究了竹屑和柠檬酸对MOS水泥凝结时间、孔隙率、力学性能及耐水性的影响,并进行了X射线衍射(X-ray diffraction, XRD)和电镜扫描(scanning electron microscope, SEM)。结果表明,竹屑的掺入缩短了MOS水泥凝结时间,增强了MOS水泥的力学性能和耐水性;柠檬酸的加入延长了竹屑-硫氧镁水泥(bamboo sawdust-MOS cement, BSMOSC)的水化诱导期,增长了水泥的凝结时间,并进一步提升了BSMOSC的力学性能和耐水性。竹屑和柠檬酸可分别作为填充剂和改性剂解决MOS水泥强度低、耐水性差的问题。Magnesium oxysulfate(MOS)cement has the advantages of excellent refractoriness,lightweight,low thermal conductivity,and early strength.However,its strength is low,and water resistance is poor.To address these shortcomings,the MOS cement was supplemented with bamboo sawdust and citric acid as modifier.This study investigates the effects of bamboo sawdust and citric acid on the setting time,porosity,mechanical properties,and water resistance of MOS cement.It was also subjected to X-ray diffraction(XRD)and scanning electron microscopy(SEM).The results demonstrate that the inclusion of bamboo sawdust significantly reduces the setting time of MOS cement and improves its mechanical properties and water resistance.Additionally,the addition of citric acid prolongs the hydration induction period of bamboo sawdust-magnesium oxysulfate cement(BSMOSC)and increases the setting time,further enhancing its mechanical properties and water resistance.Bamboo sawdust and citric acid act as effective filler and modifier,respectively,addressing the issues of low strength and poor water resistance in MOS cement.

关 键 词：硫氧镁水泥 竹屑 柠檬酸 物理性能 力学性能 耐水性 

分 类 号：TU528.01[建筑科学—建筑技术科学]