固化泥碳土无侧限抗压强度试验研究

Curing Peat Soil Unconfined Compressive Strength Tests

在水泥加固泥炭土研究基础上,选择几种不同的外加剂在不同用量下加固泥炭土。通过对加固泥炭土不同龄期抗压强度的分析,发现知水泥对泥炭土加固效果较好;石膏掺入量与固化泥炭土强度正相关;粉煤灰加固泥炭土在较长龄期效果明显;三乙醇胺能提高固化泥炭土早期强度;固化泥炭土都随龄期延长而增加。并发现水泥、粉煤灰固化泥炭土的机理是生成更多的胶凝性物质胶结泥炭土颗粒;石灰、石膏固化泥炭土的机理是在胶凝的基础上生成针状钙矾石改善泥炭土微观孔隙结构,提高抗压强度。

On the basis of researching on reinforcement for peat soil with cement,several different additives in different dosage are chosen to reinforce the peat soil. Through analysis on the compressive strength of the strengthen peat soil at different ages,the conclusions are shown in the following： the cement has the best reinforcement effect. The compressive strength of the solidified peat soil is positively related to gypsum contents. the effect of the peat soil reinforced with fly ash is distinct. the triethanolamine is able to improve the strength of the solidified peat soil in early stage. The strength of different curing peat soil increases with the prolong of curing age. Based on which,it is found that the curing mechanism of peat soil with cement and fly ash is to generate more gelling material cementing peat soil particles. Lime and gypsum curing peat soil mechanism is generating acicular ettringite to improve the peat soil microscopic pore structure and improve the compressive strength.