掺杂硅锰渣和沙漠砂的水泥基复合材料的微观结构和力学性能  

Microstructure and mechanical properties of cement-based composites doped with silica manganese slag and desert sand

作　　者：兰永军 张喆 周志尧 王紫 孟松松 李宏波[1,2,3] LAN Yongjun;ZHANG Zhe;ZHOU Zhiyao;WANG Zi;MENG Songsong;LI Hongbo(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Ningxia Engineering Technology Research Center of Water-saving Irrigation and Water Resources Regulation,Ningxia University,Yinchuan 750021,China;Engineering Research Center of Ministry of Education for Efficient Utilization of Modern Agricultural Water Resources in Arid Regions,Ningxia University,Yinchuan 750021,China;Department of Civil and Structural Engineering,University of Sheffield,Sheffield S102TN,England)

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021 [2]宁夏大学宁夏节水灌溉与水资源调控工程技术研究中心,宁夏银川750021 [3]宁夏大学旱区现代农业水资源高效利用教育部工程研究中心,宁夏银川750021 [4]Department of Civil and Structural Engineering,University of Sheffield,Sheffield S102TN,England

出　　处：《中国粉体技术》2025年第2期71-80,共10页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:52069025;宁夏自然科学基金项目,编号:2023AAS02025。

摘　　要：【目的】以硅锰渣、沙漠砂为掺料制备水泥基复合材料,研究水泥基复合材料的微观结构和力学性能,实现节能减排、有效利用资源。【方法】以硅酸盐水泥和标准砂水泥作为对照组,制备硅锰渣、沙漠砂水泥基复合材料试样;利用扫描电子显微镜和X射线衍射分析仪分析4组水泥基材料的微观结构和水化产物;分别对4组试样进行抗折和抗压强度试验,研究水泥基复合材料的力学性能。【结果】4组试样的水化产物均为氢氧化钙、钙矾石和水化硅酸钙,但水化产物含量不同。4组试样的抗折、抗压强度均随养护龄期的增大而增大;养护龄期为28d时,抗折、抗压强度由大到小的4组试样依次为硅酸盐水泥、硅锰渣水泥、标准砂水泥、沙漠砂水泥,试样的抗折强度分别为2.8、2.6、2.4、1.6MPa,抗压强度依次为58.8、57.6、41.7、24.1MPa,硅酸盐和硅锰渣水泥试样的抗压、抗折强度较为接近,且均高于标准砂和沙漠砂水泥的。在硅锰渣质量分数为15%、养护龄期为28d时,硅锰渣水泥基试样的微观结构致密,与硅酸盐水泥试样的力学性能接近。【结论】硅锰渣水泥基试样的微观结构致密,标准砂水泥试样的微观结构中含有较多孔隙,沙漠砂水泥试样中因存在明显的结团堆积现象导致结构稳定性降低;与沙漠砂相比,硅锰渣更适合替代部分水泥制备水泥基复合材料。Objective The microstructures and mechanical properties of cement-based composites were studied by using silica manganese slag and desert sand as admixtures,and the feasibility of preparing cement-based composites instead of cement was analyzed.Methods Using Portland cement and standard sand cement as control groups,silicon manganese slag and desert sand cement-based samples were prepared.Scanning electron microscopy(SEM)and X-ray diffraction(XRD)were employed to analyze the microstructure and hydration products of four different groups of cement-based composites.Flexural and compressive strength tests were conducted to evaluate the mechanical properties of the samples.Microstructural illustrations of the microcementation surface were drawn to analyze the impact of microstructure on mechanical properties.Results and Discussion XRD spectra revealed the presence of calcium hydroxide Ca(OH)2 and ettringite(AFt)diffraction peaks in all four groups.The silicon manganese slag particles in samples S1 exhibited hydration activity,accelerating the hydra-tion reaction of tricalcium silicate C3S in the later curing stages,resulting in the production of a significant amount of AFt,cal-cium silicate hydrate gel(C-S-H),and Ca(OH)2 crystals.SEM analysis showed that samples S0 and S1 had a higher quantity of hydration products and a denser,stable structure.Conversely,samples S2 and S3 had fewer hydration products and exhibited numerous pores and cracks,indicating structural instability.The flexural and compressive strengths of all four groups increased with the curing period.The order of flexural and compressive strength from highest to lowest was S0,S1,S2,and S3.At 28 days of curing,the flexural strengths of samples S0,S1,S2,and S3 were 2.8,2.6,2.4,and 1.6 MPa,respectively,while the com-pressive strengths were 58.8,57.6,41.7,and 24.1 MPa,respectively.Samples S0 and S1 had similar compressive strengths,both higher than those of S2 and S3,indicating that silicon manganese slag was more suitable to substitute cement for cement-bas

关 键 词：硅锰渣 沙漠砂 水泥基复合材料 水化产物 微观结构 力学性能 

分 类 号：TB44[一般工业技术] U414[交通运输工程—道路与铁道工程]