Formulation mechanism of bottom layer material for road improvement by top pipe sludge
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摘要: 顶管施工中会产生大量淤泥，且这些淤泥具有含水率高、稳定性差、颗粒分布不均匀等特点。淤泥固化技术是解决工程施工废弃物再利用的重要手段，为提升淤泥固结体强度，探究稳定化药剂高效配方，采用胶砂强度试验、无侧限抗压强度试验、X射线衍射分析、比表面及孔径分析试验、FTIR傅里叶红外光谱分析，检测稳定化药剂和固结体强度，探究固结体物质组成变化规律、内部孔隙度变化和微观结构中分子键的变化。结果表明：以建筑垃圾、磷石膏和矿渣作为原料，选出满足国内固废基用于道路底基层材料强度要求的配比（顶管淤泥∶建筑垃圾∶磷石膏∶矿渣=0.40∶0.55∶0.015∶0.052），养护28 d后试样的含水率为1.32%～2.89%，抗压强度为3.3～6.6 MPa。Abstract: During pipe jacking construction, a large amount of silt will be generated, which has characteristics such as high moisture content, poor stability, and uneven particle distribution. Mud solidification technology is an important means for the reuse of construction waste. To improve the strength of mud consolidation and explore the efficient formula of stabilizing agents, sand strength tests, unconfined compressive strength tests, X-ray diffraction analysis, specific surface and pore size analysis tests, FTIR Fourier transform infrared spectroscopy analysis were used to detect the strength of stabilizing agents and consolidation bodies. The changes in the composition of consolidation bodies, internal porosity changes, and molecular bonds in the microstructure were studied. The results show that using construction waste, phosphogypsum, and slag as raw materials, a ratio (top pipe sludge: construction waste: phosphogypsum: slag=0.40:0.55:0.015:0.052) was selected to meet the strength requirements of domestic solid waste base materials for road subgrade. After 28 days of curing, the moisture content of the samples was 1.32%～2.89%, and the compressive strength was 3.3～6.6 MPa.
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Key words:
- top pipe sludge /
- subbase material /
- curing and stabilization /
- compressive strength /
- pore structure
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表 1 顶管淤泥化学成分组成
成分 SiO2 Al2O3 Fe2O3 CaO P2O5 MgO 其它 占比/% 57.31 17.44 9.65 6.95 3.17 2.24 3.24 
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表 3 顶管淤泥稳定化药剂设计配比表
序号 成分质量占比/% 矿渣 磷石膏 激发剂 活化剂 D1 62 20 15 3 D2 57 20 20 3 D3 52 20 25 3 D4 62 15 20 3 D5 57 15 25 3 D6 52 15 30 3
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表 4 道路底基层材料配比表（质量比）
% 编号 稳定化药剂 建筑垃圾 顶管淤泥 外掺水 A1 8 61 35 9 A2 8 63 33 10 A3 10 58 37 8 A4 10 60 35 9 A5 8 66 30 8 A6 10 55 40 10
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表 5 道路底基层材料孔隙结构参数
样品 比表面积 /(m2·g−1) 平均孔容 /(cm3·g−1) 平均孔径 /nm 顶管淤泥 7.2137 0.017849 9.8972 D6-A1 9.9303 0.025061 10.0949 D6-A3 11.3595 0.028743 10.1213 D6-A5 10.2498 0.028550 11.1419 D6-A6 10.2861 0.028427 11.0546
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