粉煤灰掺量对石灰桩性能的影响

The Influence of Flyash Content to the Performance of Flyash Lime Pile

目的为了确定粉煤灰石灰桩复合地基设计时无侧限抗压强度技术参数,以及粉煤灰掺入量多少对粉煤灰石灰桩无侧限抗压强度的影响.方法采用试验的方法对粉煤灰石灰桩的力学性能进行实验室试验,并分析了试验所用原材料的化学成分.笔者通过6大组试件试验,研究了不同龄期、不同粉煤灰掺量情况下,粉煤灰石灰桩无侧限抗压强度的变化趋势.结果试验结果表明,粉煤灰石灰桩3d无侧限抗压强度为0,而28d无侧限抗压强度随粉煤灰掺量的增加而减少,当粉煤灰掺量达到80%以上时,28d无侧限抗压强度为0.结论宜取28d的无侧限抗压强度作为粉煤灰石灰桩的强度指标,且粉煤灰掺量越多,粉煤灰石灰桩的无侧限抗压强度越低.

This paper is to make certain the Unconfined Compressive Strength technical factors,and the influence of flyash content to the performance of flyash lime pile.Based on this,we studied the mechanical capability and analyzed the chemical ingredient of the material being tested in lab.At the same time,we studied the trend in the strength of flyash lime pile complex foundation according to the different age and different the content of flyash by 6 groups of specimen.From the trial,we can find out that the 3d-unconfined-compressive-strength of flyash lime pile was 0MPa,while the 28d-strength was changed by the flyash content,the more flyash contained in the pile,the lower the strength of the pile is.When the flyash content reached to over 80 percent,the 28d-strength will reduce to 0MPa.It is suitable to apply 28d Unconfined Compressive Strength as the main factor to evaluate flyash lime piles,and the more flyash contained in the pile,the lower the unconfined compressive strength of the pile will be.