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1、第13卷第2期建筑材料学报Vol.13,No.22010年4月JOURNALOFBUILDINGMATERIALSApr.,2010文章编号:100729629(2010)0220187206加载速率对水泥沥青砂浆力学性能的影响1,21,21,2孔祥明,刘永亮,阎培渝(1.清华大学土木工程系,北京100084;2.清华大学结构工程与振动教育部重点实验室,北京100084)摘要:选择7种变形控制加载速率(0.3～30.0mm/min),采用电液伺服控制材料万能试验机测试了两种典型水泥沥青砂浆静态单轴抗压荷载下的应力
2、-应变全曲线,分别获得了其峰值应力和弹性模量随加载速率变化的基本规律.基于建立的数学关系式对试验数据进行拟合,定量描述了加载速率对水泥沥青砂浆力学性能的影响.结果表明:沥青与水泥质量比(mA/mC)较低的水泥沥青砂浆其峰值应力和弹性模量相对较高,呈脆性材料特征;mA/mC较高的水泥沥青砂浆其峰值应力和弹性模量相对较低,呈韧性材料特征.随加载速率的增大,两种典型水泥沥青砂浆的峰值应力和弹性模量均呈增大趋势.然而,高mA/mC水泥沥青砂浆的速率影响因子是低mA/mC水泥沥青砂浆的6～10倍.随加载速率的增大,较高mA
3、/mC的水泥沥青砂浆产生了韧-脆转化现象.关键词:水泥沥青砂浆;加载速率;峰值应力;弹性模量+中图分类号:U214.99文献标志码:Adoi:10.3969/j.issn.100729629.2010.02.011InfluenceofLoadingRateonMechanicalPropertiesofCementAsphaltMortars1,21,21,2KONGXiang2ming,LIUYong2liang,YANPei2yu(1.DepartmentofCivilEngineering,Tsinghu
4、aUniversity,Beijing100084,China;2.KeyLaboratoryofStructuralEngineeringandVibrationofChinaEducationMinistry,TsinghuaUniversity,Beijing100084,China)Abstract:Theinfluenceofloadingrateonthemechanicalpropertiesoftwotypicalcementasphaltmortars(CAMs)withvariedasphal
5、ttocementratio(mA/mC)wasstudied.Uniaxialcompressivestress2straincurvesofthetwoCAMsweretestedbytheMTS(materialtestingsystem)atdifferentdisplacementratesrangingfrom0.3mm/minto30.0mm/min.Thecorrelationbetweenpeakstrengthorelasticmodulusandloadingratewasacquireda
6、ndexperimentaldatawerefittedtothepresumedmathematicalformulathatisprovenapplicableforothermaterials.Thereby,theinfluenceofdisplacementratesonthemechanicalpropertiesofsuchtwodifferentCAMswassuccessfullyexpressedquantitatively.Theresultsindicatethatthepeakstren
7、gthandtheelasticmodulusofCAMswithlowmA/mCareobviouslyhigherthanthoseofCAMswithhighermA/mC.Theformerischaracterizedbybrittlenesswhilethelaterisknownasatoughmaterial.AlthoughthepeakstrengthandtheelasticmodulusofbothCAMstendtoincreasewiththein2creasingloadingrat
8、e,therate2influencingfactorofCAMswithhighmA/mCisabout6to10timesofthatofCAMswithlowmA/mC.ForCAMswithhighmA/mC,theincreasedloadingrateleadstoatough2brittletransition.Keywords:cement2asphalt
