CAJ | 학술논문

针对青藏高原寒冷地区低温、大温差气候特点,通过沥青混合料弯曲试验,分析了温度、沥青种类、油石比、级配等对混合料弯拉特性的影响.试验得出,沥青混合料弯拉强度随着温度的升高呈上凸抛物线形变化,弯拉应变逐渐增大,劲度模量不断减小;改性沥青和高标号沥青混合料的弯拉强度和弯拉应变较大,劲度模量较小;油石比增加时,沥青混合料弯拉强度先线性增大后减小,弯拉应变增大,劲度模量减小;矿料级配越粗,沥青混合料弯拉强度越大.结果表明,温度对沥青混合料弯拉特性的影响较大,采用改性和高标号沥青,适当增加油石比、采用较粗矿料级配,有利于提高沥青混合料的低温弯曲性能.
침대청장고원한랭지구저온、대온차기후특점,통과력청혼합료만곡시험,분석료온도、력청충류、유석비、급배등대혼합료만랍특성적영향.시험득출,력청혼합료만랍강도수착온도적승고정상철포물선형변화,만랍응변축점증대,경도모량불단감소;개성력청화고표호력청혼합료적만랍강도화만랍응변교대,경도모량교소;유석비증가시,력청혼합료만랍강도선선성증대후감소,만랍응변증대,경도모량감소;광료급배월조,력청혼합료만랍강도월대.결과표명,온도대력청혼합료만랍특성적영향교대,채용개성화고표호력청,괄당증가유석비、채용교조광료급배,유리우제고력청혼합료적저온만곡성능.
Aimed at the climate feature of low temperature and large temperature difference in Qinghai-Tibet plateau area,effects of temperature,asphalt types,asphalt-aggregate ratio,aggregate gradation on the flexural tensile characteristics of asphalt mixture were analyzed by flexuml testing.The test results show that(1)Changing of the flexural tensile strength of asphalt mixture is a convex curve in shape,the stiffness modulus of asphalt mixture reduces with increasing of the flexure tensile strain;(2) The flexural tensile strength and the flexuml tensile strain of modified asphalt and hish grade asphalt mixture are comparatively large,while the flexure tensile stiffness modulus less;(3)With increasing of asphalt-aggregate ratio,the flexural tensile strength linearly increases at first and decreases afterwards,the flexure tensile strain increases and the stiffness modulus decreases;(4)The flexural tensile strength of the asphalt mixture increases when the aggregate gradation becomes coarse.The results indicate that temperature evidently effects on the flexural tensile characteristics of asphalt mixture.The low temperature flexural tensile characteristics of asphalt mixture can be enhanced by adopting modified asphalt and hish grade asphalt,increasing asphalt-aggregate ratio and adopting coarse gradation.