CAJ | 학술논문

分别利用级配检验和无核密度仪检测的方法,调查总结了AC-25和AC-13沥青混合料摊铺离析和压实离析的规律.依据该规律设计模拟级配离析和压实离析的混合料,进行了模拟动水压力试验以评价它们的抗水损坏能力.与设计级配AC-13C混合料相比较,模拟摊铺机端部离析和容许级配最粗离析的沥青混合料在动水冲刷3 h,即正负压交替作用1 350次后,25℃劈裂强度损失都超过了30%;当击实功不足时,容许级配最粗离析的沥青混合料在动水冲刷3h后25℃劈裂强度损失48.2%.即使不考虑压实不足,模拟级配粗离析和容许级配最粗离析的AC-13C混合料都显得抗水损坏能力不足.从保证沥青混合料抗水损坏能力的角度建议了沥青混合料生产和现场摊铺阶段的级配控制要求.
분별이용급배검험화무핵밀도의검측적방법,조사총결료AC-25화AC-13력청혼합료탄포리석화압실리석적규률.의거해규률설계모의급배리석화압실리석적혼합료,진행료모의동수압력시험이평개타문적항수손배능력.여설계급배AC-13C혼합료상비교,모의탄포궤단부리석화용허급배최조리석적력청혼합료재동수충쇄3 h,즉정부압교체작용1 350차후,25℃벽렬강도손실도초과료30%;당격실공불족시,용허급배최조리석적력청혼합료재동수충쇄3h후25℃벽렬강도손실48.2%.즉사불고필압실불족,모의급배조리석화용허급배최조리석적AC-13C혼합료도현득항수손배능력불족.종보증력청혼합료항수손배능력적각도건의료력청혼합료생산화현장탄포계단적급배공제요구.
The regularities of spreading segregation and compaction segregation of AC-25 and AC-13 asphalt mixtures were investigated according to the results of gradation test and non-nuclear density gauge test.Mixtures of simulated gradation segregation and compaction segregation were designed based on the segregation regularities above to evaluate the resistance of moisture-induced damage with simulated dynamic water pressure test.Compared with splitting test results of target gradation of AC-13 asphalt mixture of maximum coarse gradation segregation allowed showed a splitting strength loss of more than 30% after dynamic water erosion at 25 ℃ for 3 h (after 1350 positivenegative pressure cycles),so does asphalt mixture of simulated gradation segregation of paver edge.As for inadequately compacted asphalt mixture of maximum coarse gradation segregation allowed,splitting strength lost at 25 ℃ reaches 48.2% after dynamic water erosion for 3 h.Even without consideration of inadequate compaction,neither asphalt mixtures of coarse gradation segregation nor asphalt mixture of simulated gradation segregation of paver edge has sufficient resistance of moisture-induced damage.Finally,suggestions on gradation control in asphalt mixture production and spreading on site from the point of view of keeping mixture moisture stability were given.