改性粉土的物理力学指标试验研究  

Experimental Study on Physical and Mechanical Indexes of Modified Silt

作　　者：姚妙娴 Yao Miaoxian(China Airport Planning&Design Institute Co.,Ltd.,Beijing 100029,China)

机构地区：[1]民航机场规划设计研究总院有限公司,北京100029

出　　处：《岩土工程技术》2024年第3期374-378,共5页Geotechnical Engineering Technique

摘　　要：为了有效解决粉土在机场道基填筑中存在的工程问题,对粉土分别采用石灰、二灰(强度等级42.5水泥与石灰)和水泥(强度等级42.5、52.5)四种掺料对其进行改性,掺量质量比分别为4%,6%,8%,10%,12%,对不同改性材料进行无侧限抗压强度试验、压缩试验、击实试验和反应模量试验。结果表明:各试样的无侧限抗压强度和压缩模量变化规律明显,均随养护时间和掺量比例的提高而提高;改性粉土能有效改善原状粉土的压实度和道基反应模量性能指标;改性粉土最优掺量质量比为粉土掺8%水泥(强度等级52.5);改性后的粉土可以作为填料直接用于机场道基填筑。To solve the engineering problems existing in the filling of silt in the airport pavement subgrade effectively,the silt was modified with lime,mixed lime(strength grade 42.5 cement and lime),and cement(strength grade 42.5 and 52.5),the dosage to mass ratio of which was 4%,6%,8%,10%and 12%respectively.Unconfined compressive strength tests,compression tests,compaction tests,and reaction modulus tests on different modified materials were conducted.The results show that the unconfined compressive strength and compression modulus of each sample increase with the increase of curing time and dosage ratio.The modified silt can effectively improve the compaction degree and subgrade reaction modulus of the original silt.The optimal content to mass ratio of silt was silt combined with 8%cement(strength grade 52.5).The modified silt can be used as a filler in the airfield subgrade directly.

关 键 词：改性粉土 无侧限抗压强度 压缩模量 压实度 道基反应模量 

分 类 号：TU41[建筑科学—岩土工程]