为了研究旋转压实成型方法在乳化沥青冷再生混合料中的应用,优化相关技术参数,利用劈裂强度试验、稳定度试验及水稳定性试验,通过改变旋转压实次数、乳化沥青用量、成型试件温度及拌合用水量等因素分析对体积参数、力学性能及水稳定性能的影响.研究结果表明:旋转压实方法能够有效提高乳化沥青冷再生混合料的最大干密度和干湿劈裂强度比指标、降低空隙率及最佳拌合用水量,且随着压实次数的增加,空隙率和劈裂强度指标呈指数函数关系变化.而干湿劈裂强度比指标与空隙率指标则符合二次函数关系.研究推荐采用经旋转压实70次,温度25℃制备的成型试件,依据干湿劈裂强度比指标确定最佳乳化沥青用量.汇总研究成果,旋转压实成型方法能够有效地在乳化沥青冷再生混合料配合比中应用.利用该方法能够显著提高路面高温稳定性能和抗水损害能力.通过对早期强度和路用性能评价,各项技术指标均高于规范.%In order to study the application of gyratory compaction molding method in emulsified asphalt cold recycled mixture and optimize the relevant technical parameters, the study was carried out according to splitting strength, stability and water stability test; the design of the experiment involved changing gyration number, emulsified asphalt and water content, molded specimen temperature and other factors to analyze the volume parameters, mechanical properties and water stability. The results show that both the maximum dry density and dry and wet splitting strength ratio(DWSSR) of emulsified asphalt cold reclaimed mixture are improved by the rotary compacting method, while the porosity and the optimal dosage of water are reduced. Furthermore, with the increase of compaction times, the porosity and splitting strength index both change exponentially. DWSSR and porosity are consistent with quadratic functions. The use of gyratory compaction for 70 times at 25 ℃ and the optimum dosage of emulsified asphalt can be determined based on the splitting strength ratio. The high-temperature stability and water damage resistance of the pavement can be improved by the use of rotary compacting method effectively, and the early strength and road performance are higher than the regulatory requirements.
展开▼
