【摘要】 为研究沥青混合料GTM(Gyratory testing machine)配合比设计方法在道路工程中的有效实用性,对GTM设计和马歇尔设计的沥青混合料进行体积参数的对比分析,最后通过路用性能试验进行验证。GTM设计方法采用极限平衡状态成型试件,以稳定系数(GIS)、抗剪安全系数(GSF)综合确定最佳油石比。与马歇尔配合比设计相比,GTM确定的最佳油石比显著下降,毛体积相对密度和沥青饱和度(VFA)指标增加,空隙率(VV)和矿料间隙率(VMA)指标偏低,不适合采用马歇尔设计方法进行指标控制,在此条件下试验得出的体积参数仅作为参考指标,需要对路用性能进行相应验证;采用GTM设计的沥青混合料各项路用性能均优于马歇尔配合比设计,对高温稳定性能和低温抗冻损能力改善效果突出,低温抗裂性能优势不明显。随温度的升高,GTM的高温抗车辙能力更加优良,且具有更低的高温敏感性。AC-16试验数据显示,沥青用量降低了6.1%,毛体积相对密度提高1.9%,VV下降了37.6%,VMA下降了18.5%,稳定度提高27%。其中,60℃动稳定度提高了26.9%,65℃动稳定度提高了99.2%,低温弯曲破坏应变增加了4.7%,残留稳定度提高了4.9%,冻融劈裂强度比提高了8.7%。更多还原

【Abstract】 In ordert to study the asphalt mixture GTM(Gyratory testing machine) mixture ratio design method in the road engineering practicability effectively, through comparison and analysis of volumetric property with GTM design and Marshall design. Finally, the pavement performance of on grouted composite materials was validated. The results show that: The limit equilibrium methods adopted in GTM design methods, the optimum proportion can be determined by stability factor GIS and shear safety factor GSF. Compared with the Marshall mix design, the optimum proportion has declined markedly, volume relative density and VFA asphalt saturation index increased, voids of mineral aggregate and ratio of void have generally on the low side; Marshall design method control is not considered to fit for asphalt mixture. Under the optimum conditions. Just as a reference index volume compressibility parameters, the road performance requires corresponding verification. The performance of GTM design asphalt mixture is better than the Marshall mix design. High temperature stable performance and low temperature freeze resistance loss ability were improved significantly. Low temperature anti-cracking performance advantage is not obvious. With the increase of temperature, the higher-temperature deformation resistance of asphalt mixture was more, high temperature has a lower sensitivity. In the case of AC-16 test data, Asphalt content was reduced by 6.1%, volume relative density increased by 1.9%, VV fell by 37.6%,VMA reduced by 18.5% and stability increased by 27%. Among them, 60 ℃ dynamic stability increased by 26.9%,65 ℃ dynamic stability increased by 99.2%, low temperature bending failure strain increased by 4.7%, and the residual stability increased by 4.9%, freeze-thaw splitting strength ratio increased by 8.7%.更多还原