摘要
为了研究改良红粘土路基的长期性能,对素红粘土、机制砂改良红粘土(掺砂比40%)、生石灰改良红粘土(掺灰比4%)3种情况分别进行了0、1、3、5次干湿循环试验研究,得到了试样CBR值与干湿循环次数的关系。试验结果表明,素红粘土的长期性能对环境中的湿度变化十分敏感,随着干湿循环次数增加,素红粘土试样CBR值呈现逐渐衰减趋势,5个干湿循环周期后,CBR衰减幅度达到40%;机制砂对红粘土的长期性能略有改善,但机制砂改良红粘土对环境中的湿度变化仍然比较敏感,5个干湿循环周期后,CBR值衰减幅度约为20%;生石灰对红粘土的长期性能稳定改善效果显著,生石灰改良红粘土对环境中的湿度变化不敏感,随着干湿循环次数增加,生石灰改良红粘土试样CBR值呈现不降反升的趋势,5个干湿循环周期后CBR上升幅度高达78%。
In order to study the long terim performance of the improved CBR values of the red clay , the red clayimproved by 40% manufactured sand and the red clay improvedby 4% quicklime were testedunder 0,1 , 3 , 5 times of wet and dry cycles , andthethe CBR values and the number of wet and dry cycles w a s obtained. T h e test results show thatthe long-term performance of red clay is very sensitive to humidity changes in the environment , the C B R value of red clay samples decreasegradually while the number of cycles increased , cycles , the CBR atenuation rate reaches 40% ; T h e long-term pee＇ormance of improvedred clay by m a n u -factured sand is still sensitive to humidity changes in the environment , after 5 cycles cles ,the CBR attenuation rate reaches 20% ; H o w e v e r , the effect of quicklime on the long-term stabilityof red clay is significant , the long-term performance of improvedred clay by quicklimeis not sensitive tohumidity changes in the environment , instead of decreasing , the C B R value increanumber of cycles increased , after 5 cycles of wet and dry cycles , the CBR vthe value of sample without wet and dry cycle.
出处
《公路工程》
北大核心
2017年第5期273-277,288,共6页
Highway Engineering
基金
基金项目云交科2015(A)12
关键词
红粘土
机制砂
生石灰
值
干湿循环
red clay
manufactured sand
quicklime
C B R test
wetting-drying cycles
