从路用性能、钢桥面铺装结构、施工工艺等方面入手,对比分析了浇筑式沥青混凝土与环氧沥青混凝土的性能特点和施工特点及经济性,以指导实际施工中根据不同情况及施工要求合理选用相应的沥青混凝土。

From the road performance,the steel deck pavement structure,and the construction craft,the paper compares and analyzes the performance features,the construction features and the economical features of the pouring asphalt concrete and epoxy asphalt concrete,so as to direct the factual construction to select respective asphalt concrete respectively according to the factual construction.

通过不同结合料含量流动性检测选取了适宜的结合料用量，并确定了10%结合料用量条件下混合料适宜的拌和时间，高低温试验结果表明，环氧沥青浇筑式沥青混合料的低温性能优于普通碾压式环氧沥青混凝土，且其低温性能受拌和时间影响不大，与普通改性沥青相比，环氧沥青能够显著改善浇筑式沥青混合料的高温稳定性。

Through different binder contents flow detection selected suitable binder contents, and identified the suitable mixing time of mixture under the conditions of 10% binder content, the high and low temperature experiment results showed that, the low temperature performance of epoxy asphalt pouring asphalt mixture better than ordinary roller type epoxy asphalt concrete, and its low temperature properties little effect by mixing time, compared with common modified asphalt, epoxy asphalt could significantly improve the high temperature stability of pouring asphalt mixture.

环氧沥青混合料作为一种使用性能优异的高等级铺面工程材料,其热固性赋予沥青优良的物理、力学性能。然而环氧沥青在固化剂的官能团作用下,其化学反应复杂,反应过程受各种因素影响较大。从影响环氧沥青混合料性能的因素出发,通过超温、超时以及混合料在不同固化程度与试验温度条件下的试验研究,分析时间、温度等因素对环氧沥青混合料性能的影响,为九江长江二桥钢桥面环氧沥青混凝土铺装施工提供技术保障。

As an advanced pavement material, epoxy asphalt mixture has excellent performance which could owe to thermosetting of epoxy asphalt. However, because of the effect of functional groups of curing agent, the chemical reaction of epoxy asphalt is complex and the course will be affected by several factors. On the basis of these factors, overheating, overtime and under different solidifying extent and test tempera-ture of mixtures are investigated, the influence of time and temperature and so on are analyzed to provide a technical support for the construction of steel deck epoxy asphalt concrete pavement of Jiu Jiang Yang-tze River Second Bridge.

为明晰环氧沥青混凝土的断裂力学行为特征,基于数字图像处理技术,采用离散元方法建立了切口小梁二维模型,开展了环氧沥青混凝土的虚拟弯曲断裂试验.从细观角度分析了环氧沥青混凝土断裂过程中的力学响应,探讨了其断裂机理及裂纹扩展路径,并与室内试验结果进行了对比.结果表明,采用离散元方法可较好地反映环氧沥青混凝土的断裂力学特性,数值模拟过程中虚拟试件的力学响应与理论结果相符.虚拟试验获取的材料强度参数与室内试验的测试结果接近,误差仅为0.25%,但前者所得的劲度模量因破坏挠度偏大,较后者低16.56%.在裂纹扩展过程中,破坏易产生于黏结较为薄弱的集料-砂浆界面.虚拟试验与室内试验的对比分析结果验证了离散元模型以及参数取值的正确性.

In order to clarify the fracture mechanical behaviors of epoxy asphalt concrete (EAC),a single-notched beam two-dimensional model was established by the discrete element method based on digital image processing technology.The virtual bending fracture tests of EAC were performed to stud-y the mechanical response in the fracture process of EAC under meso-scale.The fracture mechanism and cracks propagation paths were analyzed and compared with the laboratory test results.The results show that the discrete element method can be used to exhibit the fracture characteristics of EAC ex-cellently.The mechanical responses of the virtual tests obtained by numerical simulation are coinci-dent with the theoretical results.The material strength parameters acquired by the virtual test are close to those of the indoor tests,with an error of 0.25%.However,the stiffness modulus obtained by the virtual test is 16.56%lower than the test results due to the large deflection.The damage tends to occur in the

测试了国产环氧沥青混合料的水稳定性能、高温稳定性能、低温抗裂性能以及抗疲劳性能指标。在混凝土桥面铺装时,对国产多组分环氧沥青混合料高温、低温稳定性和水稳定性指标的检验,应在环氧沥青基本固化后进行,固化温度及固化时间采用120℃,12 h(或125℃,4 h)。混合料的各项技术指标控制为:车辙试验动稳定度DS≥25 000次/mm(60℃),或DS≥15 000次/mm(70℃);浸水马歇尔残留稳定度≥85%;冻融劈裂残留强度比TSR≥85%;-10℃低温弯曲应变εB≥3.0×10-3。

The water stability, high temperature stability,low temperature crack resistance and fatigue performance of domestic epoxy asphalt mixture are tested in this essay. In the concrete bridge deck pavement,the test of domestic epoxy asphalt mixture high and low temperature stability dynamic stability and water stability should be conducted when epoxy asphalt solidifies:the stetting temperature and time is 120 ℃,12 h(or 125 ℃,4 h). The technical index of the mixture is:Rutting test dynamic stability DS ≥25,000 times/ mm(60 ℃)or DS≥15,000 times/ mm (70 ℃);Marshall immersion residual stability ≥85%;Freeze - thaw splitting residual strength ratio TSR ≥85% ;- 10 ℃ Low temperature bending strain εB ≥3. 0 × 10 - 3 .