冻融循环对气泡轻质土抗压强度的影响  

Influence of Freeze-thaw Cycles on Compressive Strength of Bubble Light Soil

作　　者：何国杰[1] 邓安仲[1] 王友军[1] 

机构地区：[1]后勤工程学院营房管理与环境工程系

出　　处：《后勤工程学院学报》2012年第4期1-6,共6页Journal of Logistical Engineering University

基　　金：重庆市科技攻关计划资助项目(CSTC,2011AC0043)

摘　　要：对12组不同配比的试样进行不同冻融循环次数的单轴抗压强度试验。研究冻融循环对气泡轻质土抗压强度的影响。结果表明，冻融循环后，气泡轻质土具有较好的力学性能，水泥掺量和气泡掺量对其抗冻融特性的影响程度不同。水泥掺量可有效抵抗冻胀力，冻融循环次数对气泡轻质土具有较大的影响。气泡掺量适中，可显著提高气泡轻质土的抗冻融性能。水分是造成气泡轻质土冻融破坏的主要因素，在满足水泥水化所需的前提下，需要适当降低轻质土的含水率。最后，根据对气泡轻质土冻融破坏特点的分析，讨论气泡轻质土抗冻融破坏机理。Compressive strength and deformation characteristics of bubble light soil are analyzed under different freeze-thaw cycles, based on 12 sets of samples with different proportions of unconfined compressive strength. The results show that bubble light soil has mechanical behavior. The components have different effects on anti-freeze-thaw characteristics of bubble light soil. Cement component enhances anti-freeze capability of bubble light soil. A moderate fraction of bubble can improve the anti-freeze-thaw char- acteristic. Water component is main source causing freeze-thaw failure. As long as adequate water supplied for cement hydration is provided, water component in bubble light soil needs eonirolling strictly. Based on the analysis of freeze-thaw failure features of bub- ble light soil, the mechanism of material freeze/thaw resistance is discussed.

关 键 词：气泡轻质土 冻融循环 抗压强度 抗冻融 

分 类 号：TU411.6[建筑科学—岩土工程] TU501[建筑科学—土工工程]