不同分散剂对红粘土颗分试验的影响

红粘土属于特殊土,具有特殊的团粒结构。土工试验规程中,对于用密度计法进行颗粒分析试验,建议采用不同的分散剂。利用江西某地的红粘土进行了密度计法的颗粒分析试验,试验结果表明：该红粘土适宜采用8%~10%的六偏磷酸钠作为分散剂进行颗粒分析试验。六偏磷酸钠对该红粘土分散效果最佳,有较好的稳定性,且能反映该红粘土的实际粒径情况。在试验结果基础上,对分散剂的作用机理进行了分析和讨论。试验结论对进一步认识和掌握红粘土的工程性质具有一定意义。

Different dispersants on red clay particle analysis tests

Red clay is one of the special soil. There are clearly states in the technical specification thatSit is suggested different dispersant for particle analysis test by densimeter method. By using the Red clay of one north plain slope in Jiangxi, a series of particle analysis tests by densimeter method are carried out; the results indicate that the red clay is suitable for using 8% ~ 10% of sodium hexametaphosphate as dispersant on granulometric composition. Sodium hexametaphosphate on the red clay dispersion effect is best, have good stability, and can reflect the actual situation of the red clay particle size. On the basis of the above findings, the influence of dispersant on the particle analysis test of studied soils was analyzed and discussed .The conclusions drawn from the test were significant and useful for further studies on the engineering properties of red clay.