早强剂在石灰粉煤灰稳定沙漠沙中的应用

APPLICATION OF EARLY STRENGTH ACCELERATOR FOR LIME-FLY ASH STABILIZED SANDS IN DESERT AREA

通过一系列试验,对石灰粉煤灰稳定沙漠沙掺加早强剂 Na2CO3和 NaOH 后的早期强度作出了评价,分析了其早强机理,同时对其后期力学性能和温缩性能进行了试验。结果表明,添加 Na2CO3和 NaOH 不仅可以显著提高二灰稳定沙漠沙的早期强度,对其后期各项性能也有明显改善。并对添加 Na2CO3和 NaOH 及不同二灰比例的稳定沙漠沙性质作了对比分析。二灰早强剂稳定沙漠沙基层的路用性能优于二灰稳定沙漠沙。

Through a series of tests, the early strength of lime-fly ash stabilized sands with early strength accelerators, NaOH and Na2CO3, are evaluated. The mechanism of early strength is analyzed, and the mechanical property and temperature contraction performance are also tested. The results indicate that not only the early compressive strength of lime-fly ash stabilized sands on 7th day increases, but also the later properties such as the indirect tensile strength and the temperature contraction performance on 180th day are improved with early strength accelerator. Moreover, the properties with NaOH and Na2CO3 and the different proportion of lime to fly ash are compared. The lime-fly ash stabilized sands with accelerator has perfect road-use performance.