C-S-H凝胶对掺元明粉碱渣拌合土性能的影响

发布时间：2018-10-26 17:14

【摘要】：为综合利用工业废料——碱渣,将其与粉煤灰按一定比例混合,并掺加一定量的元明粉,制成碱渣拌合土。通过SEM、FTIR、EDS、XRD和无侧限抗压强度五种试验方法,对比分析不同配比下的试样外貌、结构特征及力学性能。研究表明:1经SEM和FTIR分析,强碱条件下碱渣拌合土有新物质C-S-H凝胶体生成。2经EDS和XRD分析,碱渣拌合土随元明粉相对掺量的增加,生成C-S-H凝胶含量和晶体含量也增多,且C-S-H凝胶生成量与Ca/Si比值大致呈正比增长关系。3随着C-S-H凝胶体生成量的增加,碱渣拌合土试件的强度也逐渐增大,但拌合土体强度并不是完全由C-S-H凝胶所提供。28d龄期C-S-H凝胶生成量使碱渣拌合土试样抗压强度达到2.4~5.33MPa,足可满足公路路堤填垫的承载力要求。研究结论为碱渣和粉煤灰的治理提出了新思路。
[Abstract]:In order to make comprehensive use of industrial waste, alkali slag is mixed with fly ash in a certain proportion, and a certain amount of Yuan Ming powder is added to make alkaline slag mixing soil. Through five test methods of SEM,FTIR,EDS,XRD and unconfined compressive strength, the physical appearance, structural characteristics and mechanical properties of samples with different ratios were compared and analyzed. The results showed that: (1) after SEM and FTIR analysis, a new substance C-S-H gel was formed in alkaline slag mixing soil under strong alkali conditions, and 2 through EDS and XRD analysis, the relative content of alkali slag mixed soil increased with the increase of the relative content of powder. The gel content and crystal content of formed C-S-H also increased, and the gel yield of C-S-H increased in direct proportion to the ratio of Ca/Si. 3 with the increase of the amount of C-S-H gel, The strength of the soil sample mixed with alkali slag increased gradually, but the strength of the mixed soil was not completely provided by the C-S-H gel. The compressive strength of the soil mixed with alkali residue reached 2.4 ~ 5.33MPa because of the amount of C-S-H gel produced at 28 days. It can meet the bearing capacity requirement of embankment filling. The research results provide a new idea for the treatment of alkali slag and fly ash.
【作者单位】：河北工业大学;河北省土木工程技术研究中心;
【基金】：河北省科技厅基金(15273802D)
【分类号】：TU528

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