水泥-石灰和水泥-稻壳灰稳定土的力学性能和冻融耐久性研究  

Mechanical properties and freeze-thaw durability of cement-lime and cement-rice husk ash stabilized soil

作　　者：雷波[1] 黄显彬 LEI Bo;HUANG Xianbin(Guang’an Vocational&Technical College,Guang’an 638000,China;College of Civil Engineering,Sichuan Agricultural University,Dujiangyan 611800,China)

机构地区：[1]广安职业技术学院,四川广安638000 [2]四川农业大学土木工程学院,四川都江堰611800

出　　处：《中国测试》2024年第8期130-136,共7页China Measurement & Test

基　　金：广安市2023年“揭榜挂帅制”科技项目(2023JBGS01)。

摘　　要：为研究水泥-石灰和水泥-稻壳灰对土体进行加固良的效果及掺量,利用水泥、石灰和稻壳灰分别以水泥∶石灰=1∶1和水泥∶稻壳灰=1∶1制备两种稳定掺料。按照掺入比分别0%、2.5%、5%、7.5%和10%制备稳定土试样,并通过力学试验以及冻融试验对两种稳定土的三轴力学特性以及抗冻融循环的性能进行研究。结果表明:随着围压、稳定掺料和龄期的增加,稳定土的强度逐渐增加;脆性也明显增强;稳定土在3~7 d的强度增长率明显大于7~28 d的强度增长率,且在相同条件下,水泥-石灰稳定土的强度大于水泥-稻壳灰稳定土的强度。冻融循环后质量损失率和超声波变化规律表明土样的冻融耐久性顺序为:水泥-稻壳灰稳定土>水泥-石灰稳定土>纯土。To study the effect and dosage of cement-lime and cement-rice husk ash on soil reinforcement,cement,lime,and rice husk ash were used to prepare two stabilizing additives by the ratio of cement∶lime=1∶1 and cement:rice husk ash=1∶1 respectively.Then,stabilized soil samples were prepared by using stabilizing additives in the mixing ratio of 0%,2.5%,5%,7.5%,and 10%,respectively,and the triaxial mechanical properties and freeze-thaw cycle resistance of the two stabilized soils were tested by mechanical test and freeze-thaw test.The results show that with the increasing of confining pressure,stabilized admixture,and age,the strength of stabilized soil increases gradually.The brittleness also increases significantly.The strength growth rate of stabilized soil from 3 d to 7 d is significantly greater than that of 7 d to 28 d,and under the same conditions,the strength of cement-lime stabilized soil is greater than that of cement-rice husk ash stabilized soil.The change law of mass loss rate and ultrasonic wave after freeze-thaw cycles showed that the order of freeze-thaw durability of soil samples was:cement-rice husk ash stabilized soil>cement-lime stabilized soil>pure soil.

关 键 词：水泥-石灰稳定土 水泥-稻壳灰稳定土 三轴力学特性 冻融耐久性 质量损失率 超声波速 

分 类 号：TB9[一般工业技术—计量学] U213.1[机械工程—测试计量技术及仪器]