废浆体对C15～C25混凝土性能影响的研究

本文主要针对搅拌站C15、C20、C25低标号混凝土,把浓度为5wt%、10wt%、15wt%的浆体掺入其中,取代50kg、60kg、70kg、80kg清水,探究浆体对混凝土的工作性能、抗压强度、凝结时间的影响。实验表明:在C15、C20混凝土中掺加废浆体,当浓度为10wt%取代60kg清水,处于临界状态,当超过此掺量时,对混凝土性能影响较大。

废浆体对C30、C40混凝土性能影响的研究

主要针对搅拌站常用的C30、C40混凝土,把浓度为5wt%、10wt%、15wt%的浆体掺入到混凝土中,取代50、60、70、80 kg清水,探究浆体对混凝土的工作性能、抗压强度以及凝结时间的影响。实验表明:在C30、C40混凝土中掺加废浆体,当浓度为10wt%取代60 kg清水,处于临界状态,当超过此掺量时,对混凝土性能影响较大。

Retention of clay-solidified grouting curtain to Cd^(2+), Pb^(2+) and Hg^(2+) in landfill of municipal solid waste

The effects of components and their ratio of grouts on anti-seepage capability of clay-solidified grouting curtain and its permeability of heavy metal cations were investigated by permeating experiments, using reactive solute transport model to study the permeation of heavy metals (Cd2+, Pb2+ and Hg2+). The study of permeating for different mixture ratios of cement and clay indicates that hydraulic conductivity of clay-solidified grouting curtain with different ratios of solid to liquid or with the same ratio of solid to liquid but with different ratios of cement to clay is changed. The laboratory simulation test results also show that precipitates produced in heavy metal cation migration process in curtain block up water flowing passage which makes the hydraulic conductivity of the solution-permeated curtain decrease with the leakage time. The permeation velocities for different heavy metal cations vary with ionic concentration, exchange capacity and ion radius etc. The test results indicate that the permeation rapidity order of heavy metals cations in clay-solidified grouting curtain is Hg2+>Pb2+ in the same experimental circumstance. In addition, permeability for different mixture ratios and antisepsis capabilities of clay-solidified grouting curtain were studied in tests.