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。
To utilize the industrial waste comprehensively,soda residue and fly ash were mixed for padding embankment as a certain percentage. And different percentages of sodium sulfate were mixed as soda residue mixing soils.Appearances,structure characteristics and mechanical properties of different samples were analyzed and compared by five methods of SEM,FTIIR,EDS,XRD and unconfined compressive strength test. The results show that: 1By the analysis of SEM and FTIR,C-S-H gels( new substance) generate in the soda residue mixing soils on alkaline condition. 2From the analysis of EDS and XRD,the new C-S-H gels increases relatively with sodium sulfate and the amount of crystals also. The values of Ca / Si have a proportionally increasing relationship with the amount of generated C-S-H gels generally. 3The measured compressive strengths of specimens of soda residue mixing soils increase with generated C-SH gels,but their compressive strengths are not entirely provided by C-S-H gels. The generated C-S-H gels make the 28days' compressive strengths reach 2. 4 ~ 5. 33 MPa in four groups of specimens,which can make soda residue mixing soils meet the requirements of the bearing capacity for filling embankment. It proposes a new idea for treatments of soda residue and fly ash.
出处
《土木工程学报》
EI
CSCD
北大核心
2015年第S2期341-345,共5页
China Civil Engineering Journal
基金
河北省科技厅基金(15273802D)
