CAJ | 학술논문

对一种基质沥青和3种硅藻土沥青进行了差示热扫描分析,并结合相应的混合料约束试件的温度应力试验分析了硅藻土沥青的低温抗裂机理.结果表明:硅藻土沥青有优于基质沥青的低温性能;玻璃态转化温度可以较好地反映硅藻土沥青的低温性能;玻璃态转化温度与破断温度有较高的相关性.另外还进行了相应的4种沥青混合料的低温弯曲试验、低温压缩试验和收缩系数试验.结果表明:硅藻土沥青混合料的低温性能优于基质沥青混合料;硅藻土沥青混合料临界弯曲应变能密度及压缩应变能密度均大于基质沥青混合料;沥青混合料加入硅藻土后收缩系数降低.在此基础上,从混合料收缩性能和破坏能量2个角度分析了硅藻土沥青混合料的低温抗裂机理.
대일충기질력청화3충규조토력청진행료차시열소묘분석,병결합상응적혼합료약속시건적온도응력시험분석료규조토력청적저온항렬궤리.결과표명:규조토력청유우우기질력청적저온성능;파리태전화온도가이교호지반영규조토력청적저온성능;파리태전화온도여파단온도유교고적상관성.령외환진행료상응적4충력청혼합료적저온만곡시험、저온압축시험화수축계수시험.결과표명:규조토력청혼합료적저온성능우우기질력청혼합료;규조토력청혼합료림계만곡응변능밀도급압축응변능밀도균대우기질력청혼합료;력청혼합료가입규조토후수축계수강저.재차기출상,종혼합료수축성능화파배능량2개각도분석료규조토력청혼합료적저온항렬궤리.
A kind of neat asphalt and three kinds of diatomite asphalt are tested using differential scanning calorimetry(DSC).The anti-cracking mechanism of diatomite asphalt is analyzed by DSC and the thermal stress restrained specimen test(TSRST)of the asphalt mixtures.The results show that the low temperature performance of diatomite asphalt is better than that of neat asphalt.The glass transition temperature can reflect the low temperature performance of the diatomite asphalt better and has a good relationship with breaking temperatures.Besides,the TSRST,the bending test,the compressing test and the contraction coefficient test are used to study the low temperature performance of the diatomite asphalt mixture.The results prove that the low temperature performance of the diatomite asphalt mixture is better than that of the neat asphalt mixture.The critical bending strain energy density and the compressing strain energy density of the diatomite asphalt mixture are greater than those of the neat asphalt mixture.After adding diatomite to the asphalt mixture,the contraction coefficient is reduced.Based on the above results,the anti-cracking mechanism of the diatomite asphalt mixture is analyzed from the angle of contraction performance and breaking energy.