中文摘要：

采用表面吸附仪对膨胀土和石灰土样品进行了表面吸附试验,测得了土样加石灰前后的BET比表面积、BJH微孔比表面积、BJH微孔体积、微孔平均孔径及孔径中值的变化。研究了不同含灰量在饱水和非饱水养护条件下石灰土微孔结构的变化特征。试验结果表明,掺加石灰后比表面积变小,并存在一最小值;随着石灰含量的增加,小于100的超微孔显著减小,而大于100的较大孔显著增大,以100-1000的孔为优势孔。在非饱水状态,石灰含量为6%时的累积孔体积和平均孔径最大,且无侧限抗压强度最大;在饱水状态,石灰含量为10%时的累积孔体积和平均孔径最大,石灰含量为8%时无侧限抗压强度最大。因此,掺灰膨胀土在非饱水状态下的最佳石灰含量为6%,在饱水状态下的最佳石灰含量为8%-10%。

英文摘要：

Surface adsorption tests for lime-soil and expansive soil were conducted. The micro-pore structure parameters of the lime-soil samples with different lime percentages are studied under saturated curing and unsaturated curing. The parameters include BET specific surface area, BJH specific micro- pore surface area, BJH micro-pore volume, averaged pore diameters and the range of the medium pore diameters and maximum averaged pore diameter. The experimental results show that, with the increase of lime percentage, the specific surface area of the samples becomes smaller and can reach a minimum value; the micro-pores below 100A° in diameter obviously decrease, while those above 100A° with the majority of 100A° - 1 000A° in diameter obviously increase. Under the condition of unsaturated curing, the lime-soil with 6% lime has the maximum cumulative micro-pore volume, averaged pore diameter and maximum unconfined compressive strength; under the condition of saturated curing, the lime-soil with 10% lime has the maximum cumulative micro-pore volume all before and after the adding of lime in the soil and the lime-soil with 8% lime has the maximum unconfined compressive strength. It can be concluded that the optimal lime percentage is 6% for unsaturated curing and 8% -10% for saturated curing.