中国科技论文
中國科技論文
중국과기논문
Sciencepaper Online
2014年
11期
1279-1281
,共3页
沥青混合料%冻融循环%损伤%本构方程
瀝青混閤料%凍融循環%損傷%本構方程
력청혼합료%동융순배%손상%본구방정
asphalt mixture%freezing-thawing cycle%damage%constitutive equation
基于Maxwell模型建立了沥青混合料冻融损伤本构方程，以冻融后的劈裂强度作为损伤变量，分析沥青混合料的冻融损伤过程。分析表明，沥青混合料的低温劈裂强度随着冻融循环次数的增加而减小。冻融损伤过程大致分为快速损伤期、稳定损伤期及损伤发展期3个阶段。空隙率大小对沥青混合料的冻融损伤有较大影响。多孔沥青混合料劈裂强度比稳定值约为40％，沥青混凝土劈裂强度比约为70％，在4～8个冻融循环之后达到冻融损伤稳定期。
基于Maxwell模型建立瞭瀝青混閤料凍融損傷本構方程，以凍融後的劈裂彊度作為損傷變量，分析瀝青混閤料的凍融損傷過程。分析錶明，瀝青混閤料的低溫劈裂彊度隨著凍融循環次數的增加而減小。凍融損傷過程大緻分為快速損傷期、穩定損傷期及損傷髮展期3箇階段。空隙率大小對瀝青混閤料的凍融損傷有較大影響。多孔瀝青混閤料劈裂彊度比穩定值約為40％，瀝青混凝土劈裂彊度比約為70％，在4～8箇凍融循環之後達到凍融損傷穩定期。
기우Maxwell모형건립료력청혼합료동융손상본구방정，이동융후적벽렬강도작위손상변량，분석력청혼합료적동융손상과정。분석표명，력청혼합료적저온벽렬강도수착동융순배차수적증가이감소。동융손상과정대치분위쾌속손상기、은정손상기급손상발전기3개계단。공극솔대소대력청혼합료적동융손상유교대영향。다공력청혼합료벽렬강도비은정치약위40％，력청혼응토벽렬강도비약위70％，재4～8개동융순배지후체도동융손상은정기。
A damage constitutive equation was established based on Maxwell model.The indirect tensile (IDT)strength was ap-plied as the damage variable to characterize the freezing-thawing damage progress.Result shows that the IDT strength of asphalt mixture at low temperature decreased with the increasing cycles of freezing-thawing.The progress of the freezing-thawing damage can be divided into three damage phases,including rapid damage phase,stable damage phase and developing damage phase.The air void percentage of the asphalt mixture has great influence on freezing-thawing damage.The stable value of porous asphalt mix-ture cleavage strength ratio was around 40%,and the ratio of asphalt concrete IDT strength was around 70%.After 4-8 freezing and thawing cycles,the freezing-thawing damage develops into stable damage phase.
