| 高流态地质聚合物混凝土的高应变率动态压缩变形特性 |
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| 引用本文： | 罗鑫, 许金余, 苏灏扬, 李为民, 白二雷. 高流态地质聚合物混凝土的高应变率动态压缩变形特性[J]. 爆炸与冲击, 2014, 34(2): 216-222. doi: 10.11883/1001-1455(2014)02-0216-07 |
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| 作者姓名： | 罗鑫 许金余 苏灏扬 李为民 白二雷 |
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| 作者单位： | 1. 空军工程大学工程学院机场建筑工程系，陕西 西安710038; 2. 西北工业大学力学与土木建筑学院，陕西 西安710072; 3. 广州军区空军后勤部机场处，广东 广州510052 |
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| 基金项目： | 国家自然科学基金项目(51208507,51378497);陕西省自然科学基金项目(2011gm6014) |
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| 摘 要： | 以矿渣、粉煤灰为原材料，以NaOH、Na2CO3为碱激发剂，制备了强度等级为C30的高流态地质聚合物混凝土（highly-fluidized geopolymer concrete，HFGC），运用波形整形技术改进了Ø100mm SHPB实验装置，通过参数控制保证应力均匀和恒应变率加载，对HFGC开展了动态压缩实验，分析了HFGC在冲击压缩荷载下的变形特性。HFGC属于应变率敏感材料和脆性材料，高应变率作用下，HFGC的典型应力应变曲线包括压实挤密阶段、弹性阶段和软化、屈服阶段。在10~100s-1的应变率范围内，HFGC的峰值应变εc随应变率的变化表现出明显的冲击韧化效应，εc随应变率的升高先增大后减小，满足二次函数关系εc＝-1.2×10-6+1.6×10-4+0.001 7，变形特性变化的临界应变率为66.7s-1。HFGC的动态弹性模量均低于其在准静态下的弹性模量。
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| 关 键 词： | 固体力学 变形特性 动态压缩实验 高流态地质聚合物混凝土 波形整形技术 |
| 收稿时间： | 2012-09-03 |
| 修稿时间： | 2012-12-12 |
Deformation behaviors of highly-fluidized geopolymer concrete during dynamic compression at high strain rates |
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| Xin Luo, Jin-yu Xu, Hao-yang Su, Wei-min Li, Er-lei Bai. Deformation behaviors of highly-fluidized geopolymer concrete during dynamic compression at high strain rates[J]. Explosion And Shock Waves, 2014, 34(2): 216-222. doi: 10.11883/1001-1455(2014)02-0216-07 |
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| Authors: | Xin Luo Jin-yu Xu Hao-yang Su Wei-min Li Er-lei Bai |
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| Affiliation: | 1. Department of Airfield and Building Engineering, Engineering College, Air Force Engineering University, Xi'an 710038, Shaanxi, China; 2. College of Mechanics and Civil Architecture, Northwest Polytechnic University, Xi'an 710072, Shaanxi, China; 3. Airport Office, Air Force Logistics Department, Guangzhou Military Region, Guangzhou 510052, Guangdong, China |
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| Abstract: | Thehighly-fluidizedgeopolymerconcrete(HFGC)withthestrengthgradeofC30waspreparedbyusingslagandflyashasrawmaterialaswellasNaOHandNa2CO3asalkaliactivator.DynamiccompressiontestswerecarriedoutforthepreparedHFGCspecimensbyusingthe100-mm-diametersplitHopkinsonpressurebar(SHPB)apparatusimprovedbythepulse-shapingtechnique.Andinthedynamiccompressiontests,thedynamicstressequilibriumandthenearlyconstantstrainrateloadingwereachievedbycontrollingthetechniqueparameters.Basedontheabovetests,thedeformationbehaviorsoftheHFGCundertheimpactloadingswereanalyzed.TheHFGCbelongstobrittleandstrain-ratesensitivematerials.Thetypicalstress-straincurveoftheHFGCconcludescompactionstage,elasticstage,softeningandyieldingstageathighstrainrates.Inthestrainraterangefrom10to100s-1,thevariationoftheHFGC’speakstrainwithstainrateembodiesobviousimpacttoughening,thepeakstrainincreasesfirstlyandthendecreaseswithrisingstainrate.Andtheoverallchangeaccordswiththequadraticfunctionεc=-1.2×10-6ε·2+1.6×10-4ε· +0.0017,andthecriticalstrainrateofdeformationbehaviorsis66.7s-1.ThedynamicelasticmodulioftheHFGCarelowerthanthequasi-staticones. |
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| Keywords: | solid mechanics deformation behaviorsdynamiccompressiontest geopolymerconcrete')" href=" #" >highly-fluidized
geopolymerconcrete pulse-shapingtechnique |
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