再生骨料改性盐渍土配合比研究  

Study on the proportion of recycled aggregate modified saline soil

作　　者：屈辉 刘文琦 冯孝文 黄靓[2] QU Hui;LIU Wenqi;FENG Xiaowen;HUANG Liang(China State Construction Railway Investment and Construction Group Co.,Ltd.,Beijing 100000,China;School of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]中建铁路投资建设集团有限公司,北京100000 [2]湖南大学土木工程学院,湖南长沙410082

出　　处：《混凝土》2025年第2期180-184,共5页Concrete

基　　金：国家重点研发计划项目(2019YFC1904700);中建铁投集团重点研发计划项目(CSCECCZJTT-2022-08);湖南省重点研发计划项目(2024JJ9077)。

摘　　要：山东地区土壤盐分含量高,受水分和农业活动影响,对道路工程建设造成不利影响。随着道路工程的发展,工程弃土增多,环境污染问题凸显,迫切需要通过土壤改良实现资源化利用。利用再生骨料的物理特性和水泥的黏结性对盐渍土进行改良,对其击实特性、无侧限抗压强度、破坏形式进行试验探究。试验结果表明:随再生骨料取代率的提高,土体最大干密度先增后减;随再生骨料掺量的增加,土体的塑性逐渐增大;固化盐渍土的无侧限抗压强度随再生骨料掺量的增加先增后减,8%水泥掺量与40%再生骨料掺量协同作用时,固化土的强度与经济效益均达到最优。The high salt content of the soil in Shandong is affected by water and agricultural activities,which has an adverse impact on road construction.With the development of road engineering,the amount of engineering spoil has increased,and the problem of environmental pollution has become prominent,so it is urgent to realize resource utilization through soil improvement.The physical properties of recycled aggregate and the cohesiveness of cement were used to improve the saline soil,and its compaction characteristics,unconfined compressive strength and failure mode were experimentally explored.The test results show that with the increase of the substitution rate of recycled aggregate,the maximum dry density of soil increases first and then decreases.With the increase of recycled aggregate content,the plasticity of soil gradually increases.The unconfined compressive strength of solidified saline soil increases first and then decreases with the increase of recycled aggregate content,and the strength and economic benefits of solidified soil are optimal when the 8%cement content and 40%recycled aggregate content work synergistically.

关 键 词：固化盐渍土 击实特性 无侧限抗压强度 破坏形式 

分 类 号：TU528.062[建筑科学—建筑技术科学]