温拌再生沥青混合料的试验研究与应用效益分析
发布时间：2018-11-13 07:48
【摘要】：我国经济的高速发展带动了交通事业的繁荣,现阶段我国公路事业逐渐开始由大规模建设期进入养护期,随着资源、环境等问题日渐突出,传统的道路养护方式开始不适应社会发展的要求,沥青路面再生技术的研究和应用成为了我国公路事业中的重要任务。为了能够高效的利用废旧沥青路面材料(RAP),同时降低施工能耗、保证再生路面的质量,首先对RAP中各种材料进行试验分析,建立了RAP的评价体系；然后对不同RAP掺量下的温拌再生沥青混合料进行强度、高温稳定性、低温抗裂性以及水稳定性试验研究,结合试验结果对分析RAP掺量对温拌再生沥青混合料性能的影响,并提出了适宜的RAP掺量;最后通过理论分析的方法对温拌再生沥青混合料的经济效益和环境效益进行评价。对RAP中的三种主要组成材料(沥青、集料和杂质)进行试验分析,引入相对应的指标分别对沥青、集料和杂质含量进行评价并划分等级,并将三种材料的评价等级进行组合形成RAP的分级指标和评价体系,根据技术指标将RAP分为4个等级,并分析了各等级适宜的再生利用方式；对RAP掺量从0到60%的温拌再生沥青混合料进行组成设计和性能研究,结果表明：随着RAP掺量的增加,温拌再生沥青混合料的最佳新沥青用量逐渐降低了45.83%,但总沥青用量增加6.25%,温拌再生混合料的适宜降温量从32℃降低至10℃左右；温拌再生混合料的抗压强度和回弹模量线性升高,高温稳定性增强,低温稳定性和水稳定性降低,且40%的RAP掺量为温拌再生沥青混合料路用性能变化率的临界点。水稳定性试验结果表明：在RAP掺量为40%以内时,温拌再生沥青混合料的成型温度不宜低于145℃,当RAP掺量超过50%时,很小的降温量就会出现水稳定性较大的降低,成型温度不宜低于155℃。进行热再生时,为保证足够的水稳定性,RAP掺量不宜超过40%,且经过短期老化之后的再生混合料水稳定性略优于未经短期老化的混合料,但冻融劈裂强度略低。使用温拌再生沥青混合料具有明显的经济效益和环境效益,若对沥青路面进行大修,相比传统维修方式,每使用1吨温拌再生沥青混合料,材料成本约节约88.96元,且能减少燃油消耗20%以上,减少施工废气排放量约30%。
[Abstract]:The rapid development of our country's economy has led to the prosperity of the transportation industry. At this stage, the highway industry in our country has gradually begun to enter the maintenance period from the period of large-scale construction. With the problems of resources and environment becoming increasingly prominent, The traditional way of road maintenance can not meet the needs of social development. The research and application of asphalt pavement regeneration technology has become an important task in our country's highway industry. In order to make efficient use of waste asphalt pavement material (RAP),) and reduce construction energy consumption and ensure the quality of recycled pavement, the evaluation system of RAP is established by testing and analyzing all kinds of materials in RAP. Then, the strength, high temperature stability, low temperature crack resistance and water stability of warm mixed recycled asphalt mixture with different RAP content are studied, and the effect of RAP content on the performance of warm mix recycled asphalt mixture is analyzed. The suitable amount of RAP was put forward. Finally, the economic and environmental benefits of warm-mixed recycled asphalt mixture are evaluated by theoretical analysis. The three main composition materials (asphalt, aggregate and impurity) in RAP are tested and analyzed. The corresponding indexes are introduced to evaluate and classify the asphalt, aggregate and impurity content respectively. The evaluation grades of three kinds of materials were combined to form the grading index and evaluation system of RAP. According to the technical indexes, the RAP was divided into four grades, and the suitable regeneration and utilization methods of each grade were analyzed. The composition design and performance study of warm mix recycled asphalt mixture with RAP content ranging from 0% to 60% are carried out. The results show that with the increase of RAP content, the optimum new asphalt content of warm mix recycled asphalt mixture decreases gradually by 45.83%. However, with the increase of 6.25% of total asphalt content, the suitable cooling rate of warm mix and recycled mixture is reduced from 32 鈩，
本文编号：2328469
[Abstract]:The rapid development of our country's economy has led to the prosperity of the transportation industry. At this stage, the highway industry in our country has gradually begun to enter the maintenance period from the period of large-scale construction. With the problems of resources and environment becoming increasingly prominent, The traditional way of road maintenance can not meet the needs of social development. The research and application of asphalt pavement regeneration technology has become an important task in our country's highway industry. In order to make efficient use of waste asphalt pavement material (RAP),) and reduce construction energy consumption and ensure the quality of recycled pavement, the evaluation system of RAP is established by testing and analyzing all kinds of materials in RAP. Then, the strength, high temperature stability, low temperature crack resistance and water stability of warm mixed recycled asphalt mixture with different RAP content are studied, and the effect of RAP content on the performance of warm mix recycled asphalt mixture is analyzed. The suitable amount of RAP was put forward. Finally, the economic and environmental benefits of warm-mixed recycled asphalt mixture are evaluated by theoretical analysis. The three main composition materials (asphalt, aggregate and impurity) in RAP are tested and analyzed. The corresponding indexes are introduced to evaluate and classify the asphalt, aggregate and impurity content respectively. The evaluation grades of three kinds of materials were combined to form the grading index and evaluation system of RAP. According to the technical indexes, the RAP was divided into four grades, and the suitable regeneration and utilization methods of each grade were analyzed. The composition design and performance study of warm mix recycled asphalt mixture with RAP content ranging from 0% to 60% are carried out. The results show that with the increase of RAP content, the optimum new asphalt content of warm mix recycled asphalt mixture decreases gradually by 45.83%. However, with the increase of 6.25% of total asphalt content, the suitable cooling rate of warm mix and recycled mixture is reduced from 32 鈩，
本文编号：2328469
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