摘要
为研究水泥稳定再生沥青混合料(RAP)基层材料的抗拉性能,根据不同的RAP掺量(质量分数分别为0、15%、30%)和水泥剂量(质量分数分别为4.5%、5.0%)设计了4种混合料,采用劈裂试验分析了RAP掺量和试验温度分别为-15、5、20℃对材料劈裂强度、劈裂回弹模量、峰值应变、能密度和脆性指数等指标的影响.结果表明:劈裂强度、劈裂回弹模量和脆性指数均随温度升高而降低,降幅随RAP掺量增加而增大;在-15℃,随RAP掺量的增加,劈裂强度和峰值应变持续减小,脆性指数增大;正温条件下随RAP掺量增加,劈裂强度、峰值应变和能密度先增大后减小,劈裂模量和脆性指数趋于减小;模量、峰值应变、能密度和脆性指数与劈裂强度之间均呈现线性正相关关系,使各评价指标趋于改善的RAP推荐掺量为15%～20%.
To evaluate splitting tensile stress-strain properties of cement stabilized reclaimed asphalt pavement （RAP）, four types of mixture containing varying percentages of RAP （0, 15% and 30%） and cement （4. 5% and 5.0% ） were designed in this paper. A mix made from only virgin material and cement dosage of 4.5% was selected as the control mix for the investigation. Five indexes, splitting tensile strength, splitting resilient modulus, peak strain, energy density and brittleness index, were used to assess the influence of RAP content and test temperature （ - 15,5, 20 ~C and 35 ~C ） on splitting properties via splitting tensile test. The test results have indicated that splitting tensile strength, splitting resilient modulus and brittleness index decrease with the increasing of temperature, and the decreasing amplitude increases with the increasing of RAP content. The splitting tensile strength and peak strain decrease persistently with the increasing of RAP content, while the brittleness index augments at -15 ~C. In positive temperature cases, splitting strength, peak strain and energy density increase first and then diminish with the increasing of RAP content, whereas, modulus and brittleness index tend to decrease. A positive linear correlation between splitting strength and other indexes exists, and the optimal RAP content is from 15% to 20%.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2013年第4期74-78,共5页
Journal of Harbin Institute of Technology
基金
黑龙江省自然科学基金资助项目(ZD201218)
