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为了对湘南高液限粘土进行路用填料改良研究,分别对其进行了石灰、粉煤灰、水泥、石灰加粉煤灰以及砂砾的改良试验.试验结果表明,高液限粘土采用4%、5%的石灰改良后,CBR值分别提高了12.5,14.3,14.7和16.1,15.6,16.0倍;经粉煤灰改良后的高液限粘土CBR强度改善不明显;采用3%、4%的水泥改良后,高液限粘土CBR值分别提高了9.0,9.0,9.2和12.3,12.8,13.8倍;石灰和粉煤灰联合改良后,高液限粘土CBR值分别提高了6.5,7.1,8.1和15.0,15.8,16.8倍;采用砂砾改良后,高液限粘土CBR值分别提高了4.4,4.4,4.7和6.0,6.0,8.4倍,同时,还可改善其开裂特性.表6,参8.
In order to study the improvement of high-liquid-limit clay in roadway in southern Hunan, limestone, fly ash, cement, lime, fly ash and gravel were tested respectively. The results show that the high liquid limit clay is composed of 4% The CBR value increased by 12.5, 14.3, 14.7 and 16.1, 15.6 and 16.0 times respectively after the improvement of 5% lime. The improvement of CBR strength of high liquid limit clay improved by fly ash was not obvious. The cement with 3% and 4% After the improvement, the CBR of high liquid limit clay increased by 9.0, 9.0, 9.2 and 12.3, 12.8 and 13.8 times, respectively. After the combination of lime and fly ash improved, the CBR of high liquid limit clay increased by 6.5, 7.1, 8.1 and 15.0 , 15.8 and 16.8 times respectively; CBR values of high liquid limit clay increased by 4.4, 4.4, 4.7 and 6.0, 6.0 and 8.4 times respectively after gravel improvement, and at the same time, their cracking characteristics could also be improved.